- /*
- Calculate player collision box (new and old)
- */
- core::aabbox3d<f32> playerbox(
- position.X - player_radius,
- position.Y - 0.0,
- position.Z - player_radius,
- position.X + player_radius,
- position.Y + player_height,
- position.Z + player_radius
- );
- core::aabbox3d<f32> playerbox_old(
- oldpos.X - player_radius,
- oldpos.Y - 0.0,
- oldpos.Z - player_radius,
- oldpos.X + player_radius,
- oldpos.Y + player_height,
- oldpos.Z + player_radius
- );
-
- /*
- If the player's feet touch the topside of any node, this is
- set to true.
-
- Player is allowed to jump when this is true.
- */
- bool touching_ground_was = touching_ground;
- touching_ground = false;
-
- /*std::cout<<"Checking collisions for ("
- <<oldpos_i.X<<","<<oldpos_i.Y<<","<<oldpos_i.Z
- <<") -> ("
- <<pos_i.X<<","<<pos_i.Y<<","<<pos_i.Z
- <<"):"<<std::endl;*/
-
- bool standing_on_unloaded = false;
-
- /*
- Go through every node around the player
- */
- for(s16 y = oldpos_i.Y - 1; y <= oldpos_i.Y + 2; y++)
- for(s16 z = oldpos_i.Z - 1; z <= oldpos_i.Z + 1; z++)
- for(s16 x = oldpos_i.X - 1; x <= oldpos_i.X + 1; x++)
- {
- bool is_unloaded = false;
- try{
- // Player collides into walkable nodes
- if(nodemgr->get(map.getNode(v3s16(x,y,z))).walkable == false)
- continue;
- }
- catch(InvalidPositionException &e)
- {
- is_unloaded = true;
- // Doing nothing here will block the player from
- // walking over map borders
- }
-
- core::aabbox3d<f32> nodebox = getNodeBox(v3s16(x,y,z), BS);
-
- /*
- See if the player is touching ground.
-
- Player touches ground if player's minimum Y is near node's
- maximum Y and player's X-Z-area overlaps with the node's
- X-Z-area.
-
- Use 0.15*BS so that it is easier to get on a node.
- */
- if(
- //fabs(nodebox.MaxEdge.Y-playerbox.MinEdge.Y) < d
- fabs(nodebox.MaxEdge.Y-playerbox.MinEdge.Y) < 0.15*BS
- && nodebox.MaxEdge.X-d > playerbox.MinEdge.X
- && nodebox.MinEdge.X+d < playerbox.MaxEdge.X
- && nodebox.MaxEdge.Z-d > playerbox.MinEdge.Z
- && nodebox.MinEdge.Z+d < playerbox.MaxEdge.Z
- ){
- touching_ground = true;
- if(is_unloaded)
- standing_on_unloaded = true;
- }
-
- // If player doesn't intersect with node, ignore node.
- if(playerbox.intersectsWithBox(nodebox) == false)
- continue;
-
- /*
- Go through every axis
- */
- v3f dirs[3] = {
- v3f(0,0,1), // back-front
- v3f(0,1,0), // top-bottom
- v3f(1,0,0), // right-left
- };
- for(u16 i=0; i<3; i++)
- {
- /*
- Calculate values along the axis
- */
- f32 nodemax = nodebox.MaxEdge.dotProduct(dirs[i]);
- f32 nodemin = nodebox.MinEdge.dotProduct(dirs[i]);
- f32 playermax = playerbox.MaxEdge.dotProduct(dirs[i]);
- f32 playermin = playerbox.MinEdge.dotProduct(dirs[i]);
- f32 playermax_old = playerbox_old.MaxEdge.dotProduct(dirs[i]);
- f32 playermin_old = playerbox_old.MinEdge.dotProduct(dirs[i]);
-
- /*
- Check collision for the axis.
- Collision happens when player is going through a surface.
- */
- /*f32 neg_d = d;
- f32 pos_d = d;
- // Make it easier to get on top of a node
- if(i == 1)
- neg_d = 0.15*BS;
- bool negative_axis_collides =
- (nodemax > playermin && nodemax <= playermin_old + neg_d
- && m_speed.dotProduct(dirs[i]) < 0);
- bool positive_axis_collides =
- (nodemin < playermax && nodemin >= playermax_old - pos_d
- && m_speed.dotProduct(dirs[i]) > 0);*/
- bool negative_axis_collides =
- (nodemax > playermin && nodemax <= playermin_old + d
- && m_speed.dotProduct(dirs[i]) < 0);
- bool positive_axis_collides =
- (nodemin < playermax && nodemin >= playermax_old - d
- && m_speed.dotProduct(dirs[i]) > 0);
- bool main_axis_collides =
- negative_axis_collides || positive_axis_collides;
-
- /*
- Check overlap of player and node in other axes
- */
- bool other_axes_overlap = true;
- for(u16 j=0; j<3; j++)
- {
- if(j == i)
- continue;
- f32 nodemax = nodebox.MaxEdge.dotProduct(dirs[j]);
- f32 nodemin = nodebox.MinEdge.dotProduct(dirs[j]);
- f32 playermax = playerbox.MaxEdge.dotProduct(dirs[j]);
- f32 playermin = playerbox.MinEdge.dotProduct(dirs[j]);
- if(!(nodemax - d > playermin && nodemin + d < playermax))
- {
- other_axes_overlap = false;
- break;
- }
- }
-
- /*
- If this is a collision, revert the position in the main
- direction.
- */
- if(other_axes_overlap && main_axis_collides)
- {
- //v3f old_speed = m_speed;
-
- m_speed -= m_speed.dotProduct(dirs[i]) * dirs[i];
- position -= position.dotProduct(dirs[i]) * dirs[i];
- position += oldpos.dotProduct(dirs[i]) * dirs[i];
-
- /*if(collision_info)
- {
- // Report fall collision
- if(old_speed.Y < m_speed.Y - 0.1)
- {
- CollisionInfo info;
- info.t = COLLISION_FALL;
- info.speed = m_speed.Y - old_speed.Y;
- collision_info->push_back(info);
- }
- }*/
- }
-
- }
- } // xyz
-
- /*
- Check the nodes under the player to see from which node the
- player is sneaking from, if any.
- */
- {
- v3s16 pos_i_bottom = floatToInt(position - v3f(0,BS/2,0), BS);
- v2f player_p2df(position.X, position.Z);
- f32 min_distance_f = 100000.0*BS;
- // If already seeking from some node, compare to it.
- /*if(m_sneak_node_exists)
- {
- v3f sneaknode_pf = intToFloat(m_sneak_node, BS);
- v2f sneaknode_p2df(sneaknode_pf.X, sneaknode_pf.Z);
- f32 d_horiz_f = player_p2df.getDistanceFrom(sneaknode_p2df);
- f32 d_vert_f = fabs(sneaknode_pf.Y + BS*0.5 - position.Y);
- // Ignore if player is not on the same level (likely dropped)
- if(d_vert_f < 0.15*BS)
- min_distance_f = d_horiz_f;
- }*/
- v3s16 new_sneak_node = m_sneak_node;
- for(s16 x=-1; x<=1; x++)
- for(s16 z=-1; z<=1; z++)
- {
- v3s16 p = pos_i_bottom + v3s16(x,0,z);
- v3f pf = intToFloat(p, BS);
- v2f node_p2df(pf.X, pf.Z);
- f32 distance_f = player_p2df.getDistanceFrom(node_p2df);
- f32 max_axis_distance_f = MYMAX(
- fabs(player_p2df.X-node_p2df.X),
- fabs(player_p2df.Y-node_p2df.Y));
-
- if(distance_f > min_distance_f ||
- max_axis_distance_f > 0.5*BS + sneak_max + 0.1*BS)
- continue;
-
- try{
- // The node to be sneaked on has to be walkable
- if(nodemgr->get(map.getNode(p)).walkable == false)
- continue;
- // And the node above it has to be nonwalkable
- if(nodemgr->get(map.getNode(p+v3s16(0,1,0))).walkable == true)
- continue;
- }
- catch(InvalidPositionException &e)
- {
- continue;
- }
-
- min_distance_f = distance_f;
- new_sneak_node = p;
- }
-
- bool sneak_node_found = (min_distance_f < 100000.0*BS*0.9);
-
- if(control.sneak && m_sneak_node_exists)
- {
- if(sneak_node_found)
- m_sneak_node = new_sneak_node;
- }
- else
- {
- m_sneak_node = new_sneak_node;
- m_sneak_node_exists = sneak_node_found;
- }
-
- /*
- If sneaking, the player's collision box can be in air, so
- this has to be set explicitly
- */
- if(sneak_node_found && control.sneak)
- touching_ground = true;
- }
-
- /*
- Set new position
- */
- setPosition(position);
-
- /*
- Report collisions
- */
- if(collision_info)
- {
- // Report fall collision
- if(old_speed.Y < m_speed.Y - 0.1 && !standing_on_unloaded)
- {
- CollisionInfo info;
- info.t = COLLISION_FALL;
- info.speed = m_speed.Y - old_speed.Y;
- collision_info->push_back(info);
- }
- }