1 // Copyright (C) 2002-2012 Nikolaus Gebhardt
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2 // This file is part of the "Irrlicht Engine".
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3 // For conditions of distribution and use, see copyright notice in irrlicht.h
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5 #include "CSceneManager.h"
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6 #include "IVideoDriver.h"
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7 #include "IFileSystem.h"
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8 #include "SAnimatedMesh.h"
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9 #include "CMeshCache.h"
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10 #include "IGUIEnvironment.h"
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11 #include "IMaterialRenderer.h"
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12 #include "IReadFile.h"
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13 #include "IWriteFile.h"
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17 #include "CSkinnedMesh.h"
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18 #include "CXMeshFileLoader.h"
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19 #include "COBJMeshFileLoader.h"
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20 #include "CB3DMeshFileLoader.h"
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21 #include "CBillboardSceneNode.h"
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22 #include "CAnimatedMeshSceneNode.h"
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23 #include "CCameraSceneNode.h"
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24 #include "CLightSceneNode.h"
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25 #include "CMeshSceneNode.h"
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27 #ifdef _IRR_COMPILE_WITH_SHADOW_VOLUME_SCENENODE_
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28 #include "CShadowVolumeSceneNode.h"
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30 #include "IShadowVolumeSceneNode.h"
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31 #endif // _IRR_COMPILE_WITH_SHADOW_VOLUME_SCENENODE_
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33 #include "CDummyTransformationSceneNode.h"
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34 #include "CEmptySceneNode.h"
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36 #include "CSceneCollisionManager.h"
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44 CSceneManager::CSceneManager(video::IVideoDriver* driver,
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45 gui::ICursorControl* cursorControl, IMeshCache* cache)
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46 : ISceneNode(0, 0), Driver(driver),
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47 CursorControl(cursorControl),
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48 ActiveCamera(0), ShadowColor(150,0,0,0), AmbientLight(0,0,0,0), Parameters(0),
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49 MeshCache(cache), CurrentRenderPass(ESNRP_NONE)
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52 ISceneManager::setDebugName("CSceneManager ISceneManager");
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53 ISceneNode::setDebugName("CSceneManager ISceneNode");
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56 // root node's scene manager
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57 SceneManager = this;
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63 CursorControl->grab();
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65 // create mesh cache if not there already
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67 MeshCache = new CMeshCache();
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71 // set scene parameters
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72 Parameters = new io::CAttributes();
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74 // create collision manager
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75 CollisionManager = new CSceneCollisionManager(this, Driver);
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77 // add file format loaders. add the least commonly used ones first,
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78 // as these are checked last
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80 // TODO: now that we have multiple scene managers, these should be
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81 // shallow copies from the previous manager if there is one.
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83 MeshLoaderList.push_back(new CXMeshFileLoader(this));
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84 MeshLoaderList.push_back(new COBJMeshFileLoader(this));
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85 MeshLoaderList.push_back(new CB3DMeshFileLoader(this));
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90 CSceneManager::~CSceneManager()
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92 clearDeletionList();
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94 //! force to remove hardwareTextures from the driver
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95 //! because Scenes may hold internally data bounded to sceneNodes
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96 //! which may be destroyed twice
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98 Driver->removeAllHardwareBuffers();
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101 CursorControl->drop();
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103 if (CollisionManager)
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104 CollisionManager->drop();
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107 for (i=0; i<MeshLoaderList.size(); ++i)
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108 MeshLoaderList[i]->drop();
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111 ActiveCamera->drop();
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118 Parameters->drop();
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120 // remove all nodes before dropping the driver
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121 // as render targets may be destroyed twice
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130 //! gets an animateable mesh. loads it if needed. returned pointer must not be dropped.
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131 IAnimatedMesh* CSceneManager::getMesh(io::IReadFile* file)
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136 io::path name = file->getFileName();
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137 IAnimatedMesh* msh = MeshCache->getMeshByName(name);
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141 msh = getUncachedMesh(file, name, name);
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146 // load and create a mesh which we know already isn't in the cache and put it in there
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147 IAnimatedMesh* CSceneManager::getUncachedMesh(io::IReadFile* file, const io::path& filename, const io::path& cachename)
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149 IAnimatedMesh* msh = 0;
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151 // iterate the list in reverse order so user-added loaders can override the built-in ones
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152 s32 count = MeshLoaderList.size();
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153 for (s32 i=count-1; i>=0; --i)
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155 if (MeshLoaderList[i]->isALoadableFileExtension(filename))
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157 // reset file to avoid side effects of previous calls to createMesh
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159 msh = MeshLoaderList[i]->createMesh(file);
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162 MeshCache->addMesh(cachename, msh);
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170 os::Printer::log("Could not load mesh, file format seems to be unsupported", filename, ELL_ERROR);
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172 os::Printer::log("Loaded mesh", filename, ELL_DEBUG);
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177 //! returns the video driver
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178 video::IVideoDriver* CSceneManager::getVideoDriver()
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184 //! adds a scene node for rendering a static mesh
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185 //! the returned pointer must not be dropped.
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186 IMeshSceneNode* CSceneManager::addMeshSceneNode(IMesh* mesh, ISceneNode* parent, s32 id,
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187 const core::vector3df& position, const core::vector3df& rotation,
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188 const core::vector3df& scale, bool alsoAddIfMeshPointerZero)
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190 if (!alsoAddIfMeshPointerZero && !mesh)
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196 IMeshSceneNode* node = new CMeshSceneNode(mesh, parent, this, id, position, rotation, scale);
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203 //! adds a scene node for rendering an animated mesh model
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204 IAnimatedMeshSceneNode* CSceneManager::addAnimatedMeshSceneNode(IAnimatedMesh* mesh, ISceneNode* parent, s32 id,
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205 const core::vector3df& position, const core::vector3df& rotation,
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206 const core::vector3df& scale, bool alsoAddIfMeshPointerZero)
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208 if (!alsoAddIfMeshPointerZero && !mesh)
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214 IAnimatedMeshSceneNode* node =
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215 new CAnimatedMeshSceneNode(mesh, parent, this, id, position, rotation, scale);
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222 //! Adds a camera scene node to the tree and sets it as active camera.
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223 //! \param position: Position of the space relative to its parent where the camera will be placed.
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224 //! \param lookat: Position where the camera will look at. Also known as target.
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225 //! \param parent: Parent scene node of the camera. Can be null. If the parent moves,
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226 //! the camera will move too.
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227 //! \return Returns pointer to interface to camera
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228 ICameraSceneNode* CSceneManager::addCameraSceneNode(ISceneNode* parent,
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229 const core::vector3df& position, const core::vector3df& lookat, s32 id,
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235 ICameraSceneNode* node = new CCameraSceneNode(parent, this, id, position, lookat);
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238 setActiveCamera(node);
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245 //! Adds a dynamic light scene node. The light will cast dynamic light on all
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246 //! other scene nodes in the scene, which have the material flag video::MTF_LIGHTING
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247 //! turned on. (This is the default setting in most scene nodes).
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248 ILightSceneNode* CSceneManager::addLightSceneNode(ISceneNode* parent,
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249 const core::vector3df& position, video::SColorf color, f32 range, s32 id)
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254 ILightSceneNode* node = new CLightSceneNode(parent, this, id, position, color, range);
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261 //! Adds a billboard scene node to the scene. A billboard is like a 3d sprite: A 2d element,
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262 //! which always looks to the camera. It is usually used for things like explosions, fire,
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263 //! lensflares and things like that.
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264 IBillboardSceneNode* CSceneManager::addBillboardSceneNode(ISceneNode* parent,
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265 const core::dimension2d<f32>& size, const core::vector3df& position, s32 id,
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266 video::SColor colorTop, video::SColor colorBottom
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272 IBillboardSceneNode* node = new CBillboardSceneNode(parent, this, id, position, size,
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273 colorTop, colorBottom);
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280 //! Adds an empty scene node.
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281 ISceneNode* CSceneManager::addEmptySceneNode(ISceneNode* parent, s32 id)
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286 ISceneNode* node = new CEmptySceneNode(parent, this, id);
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293 //! Adds a dummy transformation scene node to the scene graph.
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294 IDummyTransformationSceneNode* CSceneManager::addDummyTransformationSceneNode(
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295 ISceneNode* parent, s32 id)
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300 IDummyTransformationSceneNode* node = new CDummyTransformationSceneNode(
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308 //! Returns the root scene node. This is the scene node which is parent
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309 //! of all scene nodes. The root scene node is a special scene node which
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310 //! only exists to manage all scene nodes. It is not rendered and cannot
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311 //! be removed from the scene.
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312 //! \return Returns a pointer to the root scene node.
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313 ISceneNode* CSceneManager::getRootSceneNode()
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319 //! Returns the current active camera.
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320 //! \return The active camera is returned. Note that this can be NULL, if there
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321 //! was no camera created yet.
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322 ICameraSceneNode* CSceneManager::getActiveCamera() const
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324 return ActiveCamera;
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328 //! Sets the active camera. The previous active camera will be deactivated.
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329 //! \param camera: The new camera which should be active.
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330 void CSceneManager::setActiveCamera(ICameraSceneNode* camera)
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335 ActiveCamera->drop();
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337 ActiveCamera = camera;
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341 //! renders the node.
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342 void CSceneManager::render()
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347 //! returns the axis aligned bounding box of this node
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348 const core::aabbox3d<f32>& CSceneManager::getBoundingBox() const
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350 _IRR_DEBUG_BREAK_IF(true) // Bounding Box of Scene Manager should never be used.
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352 static const core::aabbox3d<f32> dummy;
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357 //! returns if node is culled
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358 bool CSceneManager::isCulled(const ISceneNode* node) const
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360 const ICameraSceneNode* cam = getActiveCamera();
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365 bool result = false;
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367 // has occlusion query information
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368 if (node->getAutomaticCulling() & scene::EAC_OCC_QUERY)
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370 result = (Driver->getOcclusionQueryResult(const_cast<ISceneNode*>(node))==0);
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373 // can be seen by a bounding box ?
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374 if (!result && (node->getAutomaticCulling() & scene::EAC_BOX))
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376 core::aabbox3d<f32> tbox = node->getBoundingBox();
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377 node->getAbsoluteTransformation().transformBoxEx(tbox);
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378 result = !(tbox.intersectsWithBox(cam->getViewFrustum()->getBoundingBox() ));
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381 // can be seen by a bounding sphere
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382 if (!result && (node->getAutomaticCulling() & scene::EAC_FRUSTUM_SPHERE))
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384 const core::aabbox3df nbox = node->getTransformedBoundingBox();
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385 const float rad = nbox.getRadius();
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386 const core::vector3df center = nbox.getCenter();
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388 const float camrad = cam->getViewFrustum()->getBoundingRadius();
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389 const core::vector3df camcenter = cam->getViewFrustum()->getBoundingCenter();
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391 const float dist = (center - camcenter).getLengthSQ();
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392 const float maxdist = (rad + camrad) * (rad + camrad);
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394 result = dist > maxdist;
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397 // can be seen by cam pyramid planes ?
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398 if (!result && (node->getAutomaticCulling() & scene::EAC_FRUSTUM_BOX))
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400 SViewFrustum frust = *cam->getViewFrustum();
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402 //transform the frustum to the node's current absolute transformation
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403 core::matrix4 invTrans(node->getAbsoluteTransformation(), core::matrix4::EM4CONST_INVERSE);
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404 //invTrans.makeInverse();
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405 frust.transform(invTrans);
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407 core::vector3df edges[8];
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408 node->getBoundingBox().getEdges(edges);
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410 for (s32 i=0; i<scene::SViewFrustum::VF_PLANE_COUNT; ++i)
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412 bool boxInFrustum=false;
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413 for (u32 j=0; j<8; ++j)
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415 if (frust.planes[i].classifyPointRelation(edges[j]) != core::ISREL3D_FRONT)
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434 //! registers a node for rendering it at a specific time.
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435 u32 CSceneManager::registerNodeForRendering(ISceneNode* node, E_SCENE_NODE_RENDER_PASS pass)
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441 // take camera if it is not already registered
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445 for (u32 i = 0; i != CameraList.size(); ++i)
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447 if (CameraList[i] == node)
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455 CameraList.push_back(node);
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460 // TODO: Point Light culling..
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461 // Lighting model in irrlicht has to be redone..
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462 //if (!isCulled(node))
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464 LightList.push_back(node);
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468 case ESNRP_SKY_BOX:
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469 SkyBoxList.push_back(node);
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473 if (!isCulled(node))
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475 SolidNodeList.push_back(node);
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479 case ESNRP_TRANSPARENT:
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480 if (!isCulled(node))
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482 TransparentNodeList.push_back(TransparentNodeEntry(node, camWorldPos));
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486 case ESNRP_TRANSPARENT_EFFECT:
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487 if (!isCulled(node))
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489 TransparentEffectNodeList.push_back(TransparentNodeEntry(node, camWorldPos));
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493 case ESNRP_AUTOMATIC:
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494 if (!isCulled(node))
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496 const u32 count = node->getMaterialCount();
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499 for (u32 i=0; i<count; ++i)
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501 if (Driver->needsTransparentRenderPass(node->getMaterial(i)))
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503 // register as transparent node
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504 TransparentNodeEntry e(node, camWorldPos);
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505 TransparentNodeList.push_back(e);
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511 // not transparent, register as solid
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514 SolidNodeList.push_back(node);
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520 if (!isCulled(node))
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522 ShadowNodeList.push_back(node);
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527 if (!isCulled(node))
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529 GuiNodeList.push_back(node);
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533 case ESNRP_NONE: // ignore this one
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540 void CSceneManager::clearAllRegisteredNodesForRendering()
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542 CameraList.clear();
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544 SkyBoxList.clear();
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545 SolidNodeList.clear();
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546 TransparentNodeList.clear();
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547 TransparentEffectNodeList.clear();
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548 ShadowNodeList.clear();
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549 GuiNodeList.clear();
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552 //! This method is called just before the rendering process of the whole scene.
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553 //! draws all scene nodes
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554 void CSceneManager::drawAll()
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559 u32 i; // new ISO for scoping problem in some compilers
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561 // reset all transforms
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562 Driver->setMaterial(video::SMaterial());
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563 Driver->setTransform ( video::ETS_PROJECTION, core::IdentityMatrix );
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564 Driver->setTransform ( video::ETS_VIEW, core::IdentityMatrix );
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565 Driver->setTransform ( video::ETS_WORLD, core::IdentityMatrix );
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566 for (i=video::ETS_COUNT-1; i>=video::ETS_TEXTURE_0; --i)
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567 Driver->setTransform ( (video::E_TRANSFORMATION_STATE)i, core::IdentityMatrix );
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568 // TODO: This should not use an attribute here but a real parameter when necessary (too slow!)
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569 Driver->setAllowZWriteOnTransparent(Parameters->getAttributeAsBool(ALLOW_ZWRITE_ON_TRANSPARENT));
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571 // do animations and other stuff.
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572 OnAnimate(os::Timer::getTime());
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575 First Scene Node for prerendering should be the active camera
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576 consistent Camera is needed for culling
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578 camWorldPos.set(0,0,0);
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581 ActiveCamera->render();
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582 camWorldPos = ActiveCamera->getAbsolutePosition();
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585 // let all nodes register themselves
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586 OnRegisterSceneNode();
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588 //render camera scenes
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590 CurrentRenderPass = ESNRP_CAMERA;
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591 Driver->getOverrideMaterial().Enabled = ((Driver->getOverrideMaterial().EnablePasses & CurrentRenderPass) != 0);
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593 for (i=0; i<CameraList.size(); ++i)
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594 CameraList[i]->render();
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596 CameraList.set_used(0);
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599 //render lights scenes
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601 CurrentRenderPass = ESNRP_LIGHT;
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602 Driver->getOverrideMaterial().Enabled = ((Driver->getOverrideMaterial().EnablePasses & CurrentRenderPass) != 0);
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604 core::vector3df camWorldPos(0, 0, 0);
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606 camWorldPos = ActiveCamera->getAbsolutePosition();
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608 core::array<DistanceNodeEntry> SortedLights;
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609 SortedLights.set_used(LightList.size());
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610 for (s32 light = (s32)LightList.size() - 1; light >= 0; --light)
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611 SortedLights[light].setNodeAndDistanceFromPosition(LightList[light], camWorldPos);
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613 SortedLights.set_sorted(false);
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614 SortedLights.sort();
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616 for(s32 light = (s32)LightList.size() - 1; light >= 0; --light)
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617 LightList[light] = SortedLights[light].Node;
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619 Driver->deleteAllDynamicLights();
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621 Driver->setAmbientLight(AmbientLight);
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623 u32 maxLights = LightList.size();
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625 for (i=0; i< maxLights; ++i)
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626 LightList[i]->render();
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631 CurrentRenderPass = ESNRP_SKY_BOX;
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632 Driver->getOverrideMaterial().Enabled = ((Driver->getOverrideMaterial().EnablePasses & CurrentRenderPass) != 0);
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634 for (i=0; i<SkyBoxList.size(); ++i)
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635 SkyBoxList[i]->render();
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637 SkyBoxList.set_used(0);
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640 // render default objects
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642 CurrentRenderPass = ESNRP_SOLID;
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643 Driver->getOverrideMaterial().Enabled = ((Driver->getOverrideMaterial().EnablePasses & CurrentRenderPass) != 0);
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645 SolidNodeList.sort(); // sort by textures
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647 for (i=0; i<SolidNodeList.size(); ++i)
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648 SolidNodeList[i].Node->render();
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650 SolidNodeList.set_used(0);
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655 CurrentRenderPass = ESNRP_SHADOW;
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656 Driver->getOverrideMaterial().Enabled = ((Driver->getOverrideMaterial().EnablePasses & CurrentRenderPass) != 0);
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658 for (i=0; i<ShadowNodeList.size(); ++i)
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659 ShadowNodeList[i]->render();
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661 if (!ShadowNodeList.empty())
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662 Driver->drawStencilShadow(true,ShadowColor, ShadowColor,
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663 ShadowColor, ShadowColor);
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665 ShadowNodeList.set_used(0);
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668 // render transparent objects.
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670 CurrentRenderPass = ESNRP_TRANSPARENT;
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671 Driver->getOverrideMaterial().Enabled = ((Driver->getOverrideMaterial().EnablePasses & CurrentRenderPass) != 0);
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673 TransparentNodeList.sort(); // sort by distance from camera
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674 for (i=0; i<TransparentNodeList.size(); ++i)
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675 TransparentNodeList[i].Node->render();
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677 TransparentNodeList.set_used(0);
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680 // render transparent effect objects.
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682 CurrentRenderPass = ESNRP_TRANSPARENT_EFFECT;
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683 Driver->getOverrideMaterial().Enabled = ((Driver->getOverrideMaterial().EnablePasses & CurrentRenderPass) != 0);
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685 TransparentEffectNodeList.sort(); // sort by distance from camera
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687 for (i=0; i<TransparentEffectNodeList.size(); ++i)
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688 TransparentEffectNodeList[i].Node->render();
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690 TransparentEffectNodeList.set_used(0);
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693 // render custom gui nodes
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695 CurrentRenderPass = ESNRP_GUI;
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696 Driver->getOverrideMaterial().Enabled = ((Driver->getOverrideMaterial().EnablePasses & CurrentRenderPass) != 0);
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698 for (i=0; i<GuiNodeList.size(); ++i)
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699 GuiNodeList[i]->render();
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701 GuiNodeList.set_used(0);
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704 LightList.set_used(0);
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705 clearDeletionList();
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707 CurrentRenderPass = ESNRP_NONE;
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711 //! Sets the color of stencil buffers shadows drawn by the scene manager.
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712 void CSceneManager::setShadowColor(video::SColor color)
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714 ShadowColor = color;
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718 //! Returns the current color of shadows.
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719 video::SColor CSceneManager::getShadowColor() const
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721 return ShadowColor;
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724 IShadowVolumeSceneNode* CSceneManager::createShadowVolumeSceneNode(const IMesh* shadowMesh, ISceneNode* parent, s32 id, bool zfailmethod, f32 infinity)
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726 #ifdef _IRR_COMPILE_WITH_SHADOW_VOLUME_SCENENODE_
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727 return new CShadowVolumeSceneNode(shadowMesh, parent, this, id, zfailmethod, infinity);
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735 //! Adds an external mesh loader.
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736 void CSceneManager::addExternalMeshLoader(IMeshLoader* externalLoader)
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738 if (!externalLoader)
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741 externalLoader->grab();
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742 MeshLoaderList.push_back(externalLoader);
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746 //! Returns the number of mesh loaders supported by Irrlicht at this time
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747 u32 CSceneManager::getMeshLoaderCount() const
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749 return MeshLoaderList.size();
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753 //! Retrieve the given mesh loader
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754 IMeshLoader* CSceneManager::getMeshLoader(u32 index) const
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756 if (index < MeshLoaderList.size())
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757 return MeshLoaderList[index];
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763 //! Returns a pointer to the scene collision manager.
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764 ISceneCollisionManager* CSceneManager::getSceneCollisionManager()
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766 return CollisionManager;
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770 //! Returns a pointer to the mesh manipulator.
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771 IMeshManipulator* CSceneManager::getMeshManipulator()
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773 return Driver->getMeshManipulator();
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777 //! Adds a scene node to the deletion queue.
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778 void CSceneManager::addToDeletionQueue(ISceneNode* node)
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784 DeletionList.push_back(node);
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788 //! clears the deletion list
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789 void CSceneManager::clearDeletionList()
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791 if (DeletionList.empty())
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794 for (u32 i=0; i<DeletionList.size(); ++i)
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796 DeletionList[i]->remove();
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797 DeletionList[i]->drop();
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800 DeletionList.clear();
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804 //! Returns the first scene node with the specified name.
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805 ISceneNode* CSceneManager::getSceneNodeFromName(const char* name, ISceneNode* start)
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808 start = getRootSceneNode();
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810 if (!strcmp(start->getName(),name))
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813 ISceneNode* node = 0;
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815 const ISceneNodeList& list = start->getChildren();
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816 ISceneNodeList::const_iterator it = list.begin();
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817 for (; it!=list.end(); ++it)
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819 node = getSceneNodeFromName(name, *it);
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828 //! Returns the first scene node with the specified id.
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829 ISceneNode* CSceneManager::getSceneNodeFromId(s32 id, ISceneNode* start)
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832 start = getRootSceneNode();
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834 if (start->getID() == id)
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837 ISceneNode* node = 0;
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839 const ISceneNodeList& list = start->getChildren();
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840 ISceneNodeList::const_iterator it = list.begin();
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841 for (; it!=list.end(); ++it)
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843 node = getSceneNodeFromId(id, *it);
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852 //! Returns the first scene node with the specified type.
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853 ISceneNode* CSceneManager::getSceneNodeFromType(scene::ESCENE_NODE_TYPE type, ISceneNode* start)
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856 start = getRootSceneNode();
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858 if (start->getType() == type || ESNT_ANY == type)
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861 ISceneNode* node = 0;
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863 const ISceneNodeList& list = start->getChildren();
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864 ISceneNodeList::const_iterator it = list.begin();
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865 for (; it!=list.end(); ++it)
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867 node = getSceneNodeFromType(type, *it);
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876 //! returns scene nodes by type.
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877 void CSceneManager::getSceneNodesFromType(ESCENE_NODE_TYPE type, core::array<scene::ISceneNode*>& outNodes, ISceneNode* start)
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880 start = getRootSceneNode();
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882 if (start->getType() == type || ESNT_ANY == type)
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883 outNodes.push_back(start);
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885 const ISceneNodeList& list = start->getChildren();
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886 ISceneNodeList::const_iterator it = list.begin();
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888 for (; it!=list.end(); ++it)
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890 getSceneNodesFromType(type, outNodes, *it);
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895 //! Posts an input event to the environment. Usually you do not have to
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896 //! use this method, it is used by the internal engine.
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897 bool CSceneManager::postEventFromUser(const SEvent& event)
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900 ICameraSceneNode* cam = getActiveCamera();
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902 ret = cam->OnEvent(event);
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908 //! Removes all children of this scene node
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909 void CSceneManager::removeAll()
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911 ISceneNode::removeAll();
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912 setActiveCamera(0);
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913 // Make sure the driver is reset, might need a more complex method at some point
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915 Driver->setMaterial(video::SMaterial());
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919 //! Clears the whole scene. All scene nodes are removed.
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920 void CSceneManager::clear()
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926 //! Returns interface to the parameters set in this scene.
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927 io::IAttributes* CSceneManager::getParameters()
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933 //! Returns current render pass.
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934 E_SCENE_NODE_RENDER_PASS CSceneManager::getSceneNodeRenderPass() const
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936 return CurrentRenderPass;
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940 //! Returns an interface to the mesh cache which is shared between all existing scene managers.
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941 IMeshCache* CSceneManager::getMeshCache()
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947 //! Creates a new scene manager.
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948 ISceneManager* CSceneManager::createNewSceneManager(bool cloneContent)
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950 CSceneManager* manager = new CSceneManager(Driver, CursorControl, MeshCache);
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953 manager->cloneMembers(this, manager);
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959 //! Sets ambient color of the scene
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960 void CSceneManager::setAmbientLight(const video::SColorf &ambientColor)
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962 AmbientLight = ambientColor;
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966 //! Returns ambient color of the scene
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967 const video::SColorf& CSceneManager::getAmbientLight() const
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969 return AmbientLight;
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973 //! Get a skinned mesh, which is not available as header-only code
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974 ISkinnedMesh* CSceneManager::createSkinnedMesh()
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976 return new CSkinnedMesh();
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979 //! Returns a mesh writer implementation if available
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980 IMeshWriter* CSceneManager::createMeshWriter(EMESH_WRITER_TYPE type)
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986 // creates a scenemanager
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987 ISceneManager* createSceneManager(video::IVideoDriver* driver, gui::ICursorControl* cursorcontrol)
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989 return new CSceneManager(driver, cursorcontrol, nullptr);
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993 } // end namespace scene
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994 } // end namespace irr
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