Back to Front ordering at transparent render pass

[PitOnVMK]

Hellow all!

I work with irrlicht for several years... I like it very much!

But now I have a problem with back to front ordering of trianles at transparent render pass.

Unfortunatly, irrlicht dosent support semitransparent rendering correctly

As I found, irrlicht not sorts triangles at back to front (by distance from the camera) order.

Have someone know how to solve this problem?
thanks:)
[/img]

[vitek]

The scene manager sorts transparent scene nodes in back to front order. Have a look at the declaration of TransparentNodeEntry in CSceneManager.h. The comparison function puts nodes further from the camera first in the sorted render queue.

Travis

[Warchief]

Is this what you are having problems with:
http://irrlicht.sourceforge.net/phpBB2/ ... hp?p=68929 ?

[PitOnVMK]

The scene manager sorts transparent scene nodes in back to front order. Have a look at the declaration of TransparentNodeEntry in CSceneManager.h. The comparison function puts nodes further from the camera first in the sorted render queue.

Travis

Thanks, but problem not in the sorting of the transparent nodeS but in sorting of triangles what belongs to ONE transparent node.

I am using ONE COctTreeSceneNode for scene representation, so sorting algorithm dosent works here as we have only one scenenode.

Octree rendering irrlicht code:

Code: Select all

LightMapOctTree->calculatePolys(frust);

OctTree<video::S3DVertex2TCoords>::SIndexData* d =  LightMapOctTree->getIndexData();

for (u32 i=0; i<Materials.size(); ++i)
{
  video::IMaterialRenderer* rnd = 
   driver->getMaterialRenderer(Materials[i].MaterialType);
  bool transparent = (rnd && rnd->isTransparent());

  // only render transparent buffer if this is the transparent render pass
  // and solid only in solid pass
  if (transparent == isTransparentPass) 
  {
     driver->setMaterial(Materials[i]);
     driver->drawIndexedTriangleList(
      &LightMapMeshes[i].Vertices[0],                                 LightMapMeshes[i].Vertices.size(),
d[i].Indices, d[i].CurrentSize / 3);
  }
}

As you can see irrlicht dosent supports triangle sorting.

[PitOnVMK]

Is this what you are having problems with:
http://irrlicht.sourceforge.net/phpBB2/ ... hp?p=68929 ?

thanx, useful topic. I have allready create my own TransparentNode Structure.

[hybrid]

Ok, do you have a screenshot? Maybe it would also be good to have a small mesh to experiment with.

[PitOnVMK]

Ok, do you have a screenshot? Maybe it would also be good to have a small mesh to experiment with.

Yes, I have... but I dont know how (where) to download it (

[puh]

Use this service for posting screenshots:
http://img132.imageshack.us/