src/client/mesh.cpp

   1 /*
   2 Minetest
   3 Copyright (C) 2010-2013 celeron55, Perttu Ahola <celeron55@gmail.com>
   4
   5 This program is free software; you can redistribute it and/or modify
   6 it under the terms of the GNU Lesser General Public License as published by
   7 the Free Software Foundation; either version 2.1 of the License, or
   8 (at your option) any later version.
   9
  10 This program is distributed in the hope that it will be useful,
  11 but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13 GNU Lesser General Public License for more details.
  14
  15 You should have received a copy of the GNU Lesser General Public License along
  16 with this program; if not, write to the Free Software Foundation, Inc.,
  17 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  18 */
  19
  20 #include "mesh.h"
  21 #include "debug.h"
  22 #include "log.h"
  23 #include "irrMap.h"
  24 #include <cmath>
  25 #include <iostream>
  26 #include <IAnimatedMesh.h>
  27 #include <SAnimatedMesh.h>
  28 #include <IAnimatedMeshSceneNode.h>
  29
  30 inline static void applyShadeFactor(video::SColor& color, float factor)
  31 {
  32         color.setRed(core::clamp(core::round32(color.getRed()*factor), 0, 255));
  33         color.setGreen(core::clamp(core::round32(color.getGreen()*factor), 0, 255));
  34         color.setBlue(core::clamp(core::round32(color.getBlue()*factor), 0, 255));
  35 }
  36
  37 void applyFacesShading(video::SColor &color, const v3f &normal)
  38 {
  39         /*
  40                 Some drawtypes have normals set to (0, 0, 0), this must result in
  41                 maximum brightness: shade factor 1.0.
  42                 Shade factors for aligned cube faces are:
  43                 +Y 1.000000 sqrt(1.0)
  44                 -Y 0.447213 sqrt(0.2)
  45                 +-X 0.670820 sqrt(0.45)
  46                 +-Z 0.836660 sqrt(0.7)
  47         */
  48         float x2 = normal.X * normal.X;
  49         float y2 = normal.Y * normal.Y;
  50         float z2 = normal.Z * normal.Z;
  51         if (normal.Y < 0)
  52                 applyShadeFactor(color, 0.670820f * x2 + 0.447213f * y2 + 0.836660f * z2);
  53         else if ((x2 > 1e-3) || (z2 > 1e-3))
  54                 applyShadeFactor(color, 0.670820f * x2 + 1.000000f * y2 + 0.836660f * z2);
  55 }
  56
  57 scene::IAnimatedMesh* createCubeMesh(v3f scale)
  58 {
  59         video::SColor c(255,255,255,255);
  60         video::S3DVertex vertices[24] =
  61         {
  62                 // Up
  63                 video::S3DVertex(-0.5,+0.5,-0.5, 0,1,0, c, 0,1),
  64                 video::S3DVertex(-0.5,+0.5,+0.5, 0,1,0, c, 0,0),
  65                 video::S3DVertex(+0.5,+0.5,+0.5, 0,1,0, c, 1,0),
  66                 video::S3DVertex(+0.5,+0.5,-0.5, 0,1,0, c, 1,1),
  67                 // Down
  68                 video::S3DVertex(-0.5,-0.5,-0.5, 0,-1,0, c, 0,0),
  69                 video::S3DVertex(+0.5,-0.5,-0.5, 0,-1,0, c, 1,0),
  70                 video::S3DVertex(+0.5,-0.5,+0.5, 0,-1,0, c, 1,1),
  71                 video::S3DVertex(-0.5,-0.5,+0.5, 0,-1,0, c, 0,1),
  72                 // Right
  73                 video::S3DVertex(+0.5,-0.5,-0.5, 1,0,0, c, 0,1),
  74                 video::S3DVertex(+0.5,+0.5,-0.5, 1,0,0, c, 0,0),
  75                 video::S3DVertex(+0.5,+0.5,+0.5, 1,0,0, c, 1,0),
  76                 video::S3DVertex(+0.5,-0.5,+0.5, 1,0,0, c, 1,1),
  77                 // Left
  78                 video::S3DVertex(-0.5,-0.5,-0.5, -1,0,0, c, 1,1),
  79                 video::S3DVertex(-0.5,-0.5,+0.5, -1,0,0, c, 0,1),
  80                 video::S3DVertex(-0.5,+0.5,+0.5, -1,0,0, c, 0,0),
  81                 video::S3DVertex(-0.5,+0.5,-0.5, -1,0,0, c, 1,0),
  82                 // Back
  83                 video::S3DVertex(-0.5,-0.5,+0.5, 0,0,1, c, 1,1),
  84                 video::S3DVertex(+0.5,-0.5,+0.5, 0,0,1, c, 0,1),
  85                 video::S3DVertex(+0.5,+0.5,+0.5, 0,0,1, c, 0,0),
  86                 video::S3DVertex(-0.5,+0.5,+0.5, 0,0,1, c, 1,0),
  87                 // Front
  88                 video::S3DVertex(-0.5,-0.5,-0.5, 0,0,-1, c, 0,1),
  89                 video::S3DVertex(-0.5,+0.5,-0.5, 0,0,-1, c, 0,0),
  90                 video::S3DVertex(+0.5,+0.5,-0.5, 0,0,-1, c, 1,0),
  91                 video::S3DVertex(+0.5,-0.5,-0.5, 0,0,-1, c, 1,1),
  92         };
  93
  94         u16 indices[6] = {0,1,2,2,3,0};
  95
  96         scene::SMesh *mesh = new scene::SMesh();
  97         for (u32 i=0; i<6; ++i)
  98         {
  99                 scene::IMeshBuffer *buf = new scene::SMeshBuffer();
 100                 buf->append(vertices + 4 * i, 4, indices, 6);
 101                 // Set default material
 102                 buf->getMaterial().setFlag(video::EMF_LIGHTING, false);
 103                 buf->getMaterial().setFlag(video::EMF_BILINEAR_FILTER, false);
 104                 buf->getMaterial().MaterialType = video::EMT_TRANSPARENT_ALPHA_CHANNEL_REF;
 105                 // Add mesh buffer to mesh
 106                 mesh->addMeshBuffer(buf);
 107                 buf->drop();
 108         }
 109
 110         scene::SAnimatedMesh *anim_mesh = new scene::SAnimatedMesh(mesh);
 111         mesh->drop();
 112         scaleMesh(anim_mesh, scale);  // also recalculates bounding box
 113         return anim_mesh;
 114 }
 115
 116 void scaleMesh(scene::IMesh *mesh, v3f scale)
 117 {
 118         if (mesh == NULL)
 119                 return;
 120
 121         aabb3f bbox;
 122         bbox.reset(0, 0, 0);
 123
 124         u32 mc = mesh->getMeshBufferCount();
 125         for (u32 j = 0; j < mc; j++) {
 126                 scene::IMeshBuffer *buf = mesh->getMeshBuffer(j);
 127                 const u32 stride = getVertexPitchFromType(buf->getVertexType());
 128                 u32 vertex_count = buf->getVertexCount();
 129                 u8 *vertices = (u8 *)buf->getVertices();
 130                 for (u32 i = 0; i < vertex_count; i++)
 131                         ((video::S3DVertex *)(vertices + i * stride))->Pos *= scale;
 132
 133                 buf->recalculateBoundingBox();
 134
 135                 // calculate total bounding box
 136                 if (j == 0)
 137                         bbox = buf->getBoundingBox();
 138                 else
 139                         bbox.addInternalBox(buf->getBoundingBox());
 140         }
 141         mesh->setBoundingBox(bbox);
 142 }
 143
 144 void translateMesh(scene::IMesh *mesh, v3f vec)
 145 {
 146         if (mesh == NULL)
 147                 return;
 148
 149         aabb3f bbox;
 150         bbox.reset(0, 0, 0);
 151
 152         u32 mc = mesh->getMeshBufferCount();
 153         for (u32 j = 0; j < mc; j++) {
 154                 scene::IMeshBuffer *buf = mesh->getMeshBuffer(j);
 155                 const u32 stride = getVertexPitchFromType(buf->getVertexType());
 156                 u32 vertex_count = buf->getVertexCount();
 157                 u8 *vertices = (u8 *)buf->getVertices();
 158                 for (u32 i = 0; i < vertex_count; i++)
 159                         ((video::S3DVertex *)(vertices + i * stride))->Pos += vec;
 160
 161                 buf->recalculateBoundingBox();
 162
 163                 // calculate total bounding box
 164                 if (j == 0)
 165                         bbox = buf->getBoundingBox();
 166                 else
 167                         bbox.addInternalBox(buf->getBoundingBox());
 168         }
 169         mesh->setBoundingBox(bbox);
 170 }
 171
 172 void setMeshBufferColor(scene::IMeshBuffer *buf, const video::SColor &color)
 173 {
 174         const u32 stride = getVertexPitchFromType(buf->getVertexType());
 175         u32 vertex_count = buf->getVertexCount();
 176         u8 *vertices = (u8 *) buf->getVertices();
 177         for (u32 i = 0; i < vertex_count; i++)
 178                 ((video::S3DVertex *) (vertices + i * stride))->Color = color;
 179 }
 180
 181 void setAnimatedMeshColor(scene::IAnimatedMeshSceneNode *node, const video::SColor &color)
 182 {
 183         for (u32 i = 0; i < node->getMaterialCount(); ++i) {
 184                 node->getMaterial(i).EmissiveColor = color;
 185         }
 186 }
 187
 188 void setMeshColor(scene::IMesh *mesh, const video::SColor &color)
 189 {
 190         if (mesh == NULL)
 191                 return;
 192
 193         u32 mc = mesh->getMeshBufferCount();
 194         for (u32 j = 0; j < mc; j++)
 195                 setMeshBufferColor(mesh->getMeshBuffer(j), color);
 196 }
 197
 198 void setMeshBufferTextureCoords(scene::IMeshBuffer *buf, const v2f *uv, u32 count)
 199 {
 200         const u32 stride = getVertexPitchFromType(buf->getVertexType());
 201         assert(buf->getVertexCount() >= count);
 202         u8 *vertices = (u8 *) buf->getVertices();
 203         for (u32 i = 0; i < count; i++)
 204                 ((video::S3DVertex*) (vertices + i * stride))->TCoords = uv[i];
 205 }
 206
 207 template <typename F>
 208 static void applyToMesh(scene::IMesh *mesh, const F &fn)
 209 {
 210         u16 mc = mesh->getMeshBufferCount();
 211         for (u16 j = 0; j < mc; j++) {
 212                 scene::IMeshBuffer *buf = mesh->getMeshBuffer(j);
 213                 const u32 stride = getVertexPitchFromType(buf->getVertexType());
 214                 u32 vertex_count = buf->getVertexCount();
 215                 char *vertices = reinterpret_cast<char *>(buf->getVertices());
 216                 for (u32 i = 0; i < vertex_count; i++)
 217                         fn(reinterpret_cast<video::S3DVertex *>(vertices + i * stride));
 218         }
 219 }
 220
 221 void colorizeMeshBuffer(scene::IMeshBuffer *buf, const video::SColor *buffercolor)
 222 {
 223         const u32 stride = getVertexPitchFromType(buf->getVertexType());
 224         u32 vertex_count = buf->getVertexCount();
 225         u8 *vertices = (u8 *) buf->getVertices();
 226         for (u32 i = 0; i < vertex_count; i++) {
 227                 video::S3DVertex *vertex = (video::S3DVertex *) (vertices + i * stride);
 228                 video::SColor *vc = &(vertex->Color);
 229                 // Reset color
 230                 *vc = *buffercolor;
 231                 // Apply shading
 232                 applyFacesShading(*vc, vertex->Normal);
 233         }
 234 }
 235
 236 void setMeshColorByNormalXYZ(scene::IMesh *mesh,
 237                 const video::SColor &colorX,
 238                 const video::SColor &colorY,
 239                 const video::SColor &colorZ)
 240 {
 241         if (!mesh)
 242                 return;
 243         auto colorizator = [=] (video::S3DVertex *vertex) {
 244                 f32 x = fabs(vertex->Normal.X);
 245                 f32 y = fabs(vertex->Normal.Y);
 246                 f32 z = fabs(vertex->Normal.Z);
 247                 if (x >= y && x >= z)
 248                         vertex->Color = colorX;
 249                 else if (y >= z)
 250                         vertex->Color = colorY;
 251                 else
 252                         vertex->Color = colorZ;
 253         };
 254         applyToMesh(mesh, colorizator);
 255 }
 256
 257 void setMeshColorByNormal(scene::IMesh *mesh, const v3f &normal,
 258                 const video::SColor &color)
 259 {
 260         if (!mesh)
 261                 return;
 262         auto colorizator = [normal, color] (video::S3DVertex *vertex) {
 263                 if (vertex->Normal == normal)
 264                         vertex->Color = color;
 265         };
 266         applyToMesh(mesh, colorizator);
 267 }
 268
 269 template <float v3f::*U, float v3f::*V>
 270 static void rotateMesh(scene::IMesh *mesh, float degrees)
 271 {
 272         degrees *= M_PI / 180.0f;
 273         float c = std::cos(degrees);
 274         float s = std::sin(degrees);
 275         auto rotator = [c, s] (video::S3DVertex *vertex) {
 276                 float u = vertex->Pos.*U;
 277                 float v = vertex->Pos.*V;
 278                 vertex->Pos.*U = c * u - s * v;
 279                 vertex->Pos.*V = s * u + c * v;
 280         };
 281         applyToMesh(mesh, rotator);
 282 }
 283
 284 void rotateMeshXYby(scene::IMesh *mesh, f64 degrees)
 285 {
 286         rotateMesh<&v3f::X, &v3f::Y>(mesh, degrees);
 287 }
 288
 289 void rotateMeshXZby(scene::IMesh *mesh, f64 degrees)
 290 {
 291         rotateMesh<&v3f::X, &v3f::Z>(mesh, degrees);
 292 }
 293
 294 void rotateMeshYZby(scene::IMesh *mesh, f64 degrees)
 295 {
 296         rotateMesh<&v3f::Y, &v3f::Z>(mesh, degrees);
 297 }
 298
 299 void rotateMeshBy6dFacedir(scene::IMesh *mesh, int facedir)
 300 {
 301         int axisdir = facedir >> 2;
 302         facedir &= 0x03;
 303         switch (facedir) {
 304                 case 1: rotateMeshXZby(mesh, -90); break;
 305                 case 2: rotateMeshXZby(mesh, 180); break;
 306                 case 3: rotateMeshXZby(mesh, 90); break;
 307         }
 308         switch (axisdir) {
 309                 case 1: rotateMeshYZby(mesh, 90); break; // z+
 310                 case 2: rotateMeshYZby(mesh, -90); break; // z-
 311                 case 3: rotateMeshXYby(mesh, -90); break; // x+
 312                 case 4: rotateMeshXYby(mesh, 90); break; // x-
 313                 case 5: rotateMeshXYby(mesh, -180); break;
 314         }
 315 }
 316
 317 void recalculateBoundingBox(scene::IMesh *src_mesh)
 318 {
 319         aabb3f bbox;
 320         bbox.reset(0,0,0);
 321         for (u16 j = 0; j < src_mesh->getMeshBufferCount(); j++) {
 322                 scene::IMeshBuffer *buf = src_mesh->getMeshBuffer(j);
 323                 buf->recalculateBoundingBox();
 324                 if (j == 0)
 325                         bbox = buf->getBoundingBox();
 326                 else
 327                         bbox.addInternalBox(buf->getBoundingBox());
 328         }
 329         src_mesh->setBoundingBox(bbox);
 330 }
 331
 332 bool checkMeshNormals(scene::IMesh *mesh)
 333 {
 334         // Assume correct normals if this many first faces get it right.
 335         static const u16 MAX_FACES_TO_CHECK = 9;
 336
 337         u32 buffer_count = mesh->getMeshBufferCount();
 338
 339         for (u32 i = 0; i < buffer_count; i++) {
 340                 scene::IMeshBuffer *buffer = mesh->getMeshBuffer(i);
 341
 342                 // Here we intentionally check only first normal, assuming that if buffer
 343                 // has it valid, then most likely all other ones are fine too. We can
 344                 // check all of the normals to have length, but it seems like an overkill
 345                 // hurting the performance and covering only really weird broken models.
 346                 f32 length = buffer->getNormal(0).getLength();
 347
 348                 if (!std::isfinite(length) || length < 1e-10f)
 349                         return false;
 350
 351                 const u16 count = MYMIN(MAX_FACES_TO_CHECK * 3, buffer->getIndexCount() - 3);
 352                 for (u16 i = 0; i < count; i += 3) {
 353
 354                         core::plane3df plane(buffer->getPosition(buffer->getIndices()[i]),
 355                                         buffer->getPosition(buffer->getIndices()[i+1]),
 356                                         buffer->getPosition(buffer->getIndices()[i+2]));
 357
 358                         for (u16 j = 0; j < 3; j++)
 359                                 if (plane.Normal.dotProduct(buffer->getNormal(buffer->getIndices()[i+j])) <= 0)
 360                                         return false;
 361                 }
 362
 363         }
 364
 365         return true;
 366 }
 367
 368 scene::IMeshBuffer* cloneMeshBuffer(scene::IMeshBuffer *mesh_buffer)
 369 {
 370         switch (mesh_buffer->getVertexType()) {
 371         case video::EVT_STANDARD: {
 372                 video::S3DVertex *v = (video::S3DVertex *) mesh_buffer->getVertices();
 373                 u16 *indices = mesh_buffer->getIndices();
 374                 scene::SMeshBuffer *cloned_buffer = new scene::SMeshBuffer();
 375                 cloned_buffer->append(v, mesh_buffer->getVertexCount(), indices,
 376                         mesh_buffer->getIndexCount());
 377                 return cloned_buffer;
 378         }
 379         case video::EVT_2TCOORDS: {
 380                 video::S3DVertex2TCoords *v =
 381                         (video::S3DVertex2TCoords *) mesh_buffer->getVertices();
 382                 u16 *indices = mesh_buffer->getIndices();
 383                 scene::SMeshBufferLightMap *cloned_buffer =
 384                         new scene::SMeshBufferLightMap();
 385                 cloned_buffer->append(v, mesh_buffer->getVertexCount(), indices,
 386                         mesh_buffer->getIndexCount());
 387                 return cloned_buffer;
 388         }
 389         case video::EVT_TANGENTS: {
 390                 video::S3DVertexTangents *v =
 391                         (video::S3DVertexTangents *) mesh_buffer->getVertices();
 392                 u16 *indices = mesh_buffer->getIndices();
 393                 scene::SMeshBufferTangents *cloned_buffer =
 394                         new scene::SMeshBufferTangents();
 395                 cloned_buffer->append(v, mesh_buffer->getVertexCount(), indices,
 396                         mesh_buffer->getIndexCount());
 397                 return cloned_buffer;
 398         }
 399         }
 400         // This should not happen.
 401         sanity_check(false);
 402         return NULL;
 403 }
 404
 405 scene::SMesh* cloneMesh(scene::IMesh *src_mesh)
 406 {
 407         scene::SMesh* dst_mesh = new scene::SMesh();
 408         for (u16 j = 0; j < src_mesh->getMeshBufferCount(); j++) {
 409                 scene::IMeshBuffer *temp_buf = cloneMeshBuffer(
 410                         src_mesh->getMeshBuffer(j));
 411                 dst_mesh->addMeshBuffer(temp_buf);
 412                 temp_buf->drop();
 413
 414         }
 415         return dst_mesh;
 416 }
 417
 418 scene::IMesh* convertNodeboxesToMesh(const std::vector<aabb3f> &boxes,
 419                 const f32 *uv_coords, float expand)
 420 {
 421         scene::SMesh* dst_mesh = new scene::SMesh();
 422
 423         for (u16 j = 0; j < 6; j++)
 424         {
 425                 scene::IMeshBuffer *buf = new scene::SMeshBuffer();
 426                 buf->getMaterial().setFlag(video::EMF_LIGHTING, false);
 427                 buf->getMaterial().setFlag(video::EMF_BILINEAR_FILTER, false);
 428                 dst_mesh->addMeshBuffer(buf);
 429                 buf->drop();
 430         }
 431
 432         video::SColor c(255,255,255,255);
 433
 434         for (aabb3f box : boxes) {
 435                 box.repair();
 436
 437                 box.MinEdge.X -= expand;
 438                 box.MinEdge.Y -= expand;
 439                 box.MinEdge.Z -= expand;
 440                 box.MaxEdge.X += expand;
 441                 box.MaxEdge.Y += expand;
 442                 box.MaxEdge.Z += expand;
 443
 444                 // Compute texture UV coords
 445                 f32 tx1 = (box.MinEdge.X / BS) + 0.5;
 446                 f32 ty1 = (box.MinEdge.Y / BS) + 0.5;
 447                 f32 tz1 = (box.MinEdge.Z / BS) + 0.5;
 448                 f32 tx2 = (box.MaxEdge.X / BS) + 0.5;
 449                 f32 ty2 = (box.MaxEdge.Y / BS) + 0.5;
 450                 f32 tz2 = (box.MaxEdge.Z / BS) + 0.5;
 451
 452                 f32 txc_default[24] = {
 453                         // up
 454                         tx1, 1 - tz2, tx2, 1 - tz1,
 455                         // down
 456                         tx1, tz1, tx2, tz2,
 457                         // right
 458                         tz1, 1 - ty2, tz2, 1 - ty1,
 459                         // left
 460                         1 - tz2, 1 - ty2, 1 - tz1, 1 - ty1,
 461                         // back
 462                         1 - tx2, 1 - ty2, 1 - tx1, 1 - ty1,
 463                         // front
 464                         tx1, 1 - ty2, tx2, 1 - ty1,
 465                 };
 466
 467                 // use default texture UV mapping if not provided
 468                 const f32 *txc = uv_coords ? uv_coords : txc_default;
 469
 470                 v3f min = box.MinEdge;
 471                 v3f max = box.MaxEdge;
 472
 473                 video::S3DVertex vertices[24] =
 474                 {
 475                         // up
 476                         video::S3DVertex(min.X,max.Y,max.Z, 0,1,0, c, txc[0],txc[1]),
 477                         video::S3DVertex(max.X,max.Y,max.Z, 0,1,0, c, txc[2],txc[1]),
 478                         video::S3DVertex(max.X,max.Y,min.Z, 0,1,0, c, txc[2],txc[3]),
 479                         video::S3DVertex(min.X,max.Y,min.Z, 0,1,0, c, txc[0],txc[3]),
 480                         // down
 481                         video::S3DVertex(min.X,min.Y,min.Z, 0,-1,0, c, txc[4],txc[5]),
 482                         video::S3DVertex(max.X,min.Y,min.Z, 0,-1,0, c, txc[6],txc[5]),
 483                         video::S3DVertex(max.X,min.Y,max.Z, 0,-1,0, c, txc[6],txc[7]),
 484                         video::S3DVertex(min.X,min.Y,max.Z, 0,-1,0, c, txc[4],txc[7]),
 485                         // right
 486                         video::S3DVertex(max.X,max.Y,min.Z, 1,0,0, c, txc[ 8],txc[9]),
 487                         video::S3DVertex(max.X,max.Y,max.Z, 1,0,0, c, txc[10],txc[9]),
 488                         video::S3DVertex(max.X,min.Y,max.Z, 1,0,0, c, txc[10],txc[11]),
 489                         video::S3DVertex(max.X,min.Y,min.Z, 1,0,0, c, txc[ 8],txc[11]),
 490                         // left
 491                         video::S3DVertex(min.X,max.Y,max.Z, -1,0,0, c, txc[12],txc[13]),
 492                         video::S3DVertex(min.X,max.Y,min.Z, -1,0,0, c, txc[14],txc[13]),
 493                         video::S3DVertex(min.X,min.Y,min.Z, -1,0,0, c, txc[14],txc[15]),
 494                         video::S3DVertex(min.X,min.Y,max.Z, -1,0,0, c, txc[12],txc[15]),
 495                         // back
 496                         video::S3DVertex(max.X,max.Y,max.Z, 0,0,1, c, txc[16],txc[17]),
 497                         video::S3DVertex(min.X,max.Y,max.Z, 0,0,1, c, txc[18],txc[17]),
 498                         video::S3DVertex(min.X,min.Y,max.Z, 0,0,1, c, txc[18],txc[19]),
 499                         video::S3DVertex(max.X,min.Y,max.Z, 0,0,1, c, txc[16],txc[19]),
 500                         // front
 501                         video::S3DVertex(min.X,max.Y,min.Z, 0,0,-1, c, txc[20],txc[21]),
 502                         video::S3DVertex(max.X,max.Y,min.Z, 0,0,-1, c, txc[22],txc[21]),
 503                         video::S3DVertex(max.X,min.Y,min.Z, 0,0,-1, c, txc[22],txc[23]),
 504                         video::S3DVertex(min.X,min.Y,min.Z, 0,0,-1, c, txc[20],txc[23]),
 505                 };
 506
 507                 u16 indices[] = {0,1,2,2,3,0};
 508
 509                 for(u16 j = 0; j < 24; j += 4)
 510                 {
 511                         scene::IMeshBuffer *buf = dst_mesh->getMeshBuffer(j / 4);
 512                         buf->append(vertices + j, 4, indices, 6);
 513                 }
 514         }
 515         return dst_mesh;
 516 }