Trouble about COLLADA (Octree and texture)

Shomaa · Post by **Shomaa** » Fri Apr 17, 2009 10:49 am

Hi,
I use Irrlicht for a school project and we got a problem with COLLADA.
the real meshes looks like this :

http://picasaweb.google.fr/lh/photo/8aE ... directlink

but in Irrlicht, every meshes is reverted in Z axis (Textures and meshes)
also, the textures become black accordind the camera angle , why ?

http://picasaweb.google.com/lh/photo/Mv ... directlink

thanks.

hybrid · Post by **hybrid** » Fri Apr 17, 2009 12:30 pm

The zbuffer problem is probably related to the z-up problem that wasn't solved in Irrlicht 1.5 IIRC. The current SVN/trunk version has this fixed, though, and usually handles geometry and textures correctly. Transparency is not correct in most situations, though. I could test the mesh with the latest meshviewer version and maybe also fix the other problems if you can provide me with the mesh.

Shomaa · Post by **Shomaa** » Fri Apr 17, 2009 12:59 pm

Hybrid :
I gave you a piece of the mesh via PM

thanks for the help

hybrid · Post by **hybrid** » Fri Apr 17, 2009 3:41 pm

Is there somewhere the whole scene in one file, or do you load many "parts" as separate files? Collada is quite good at storing huge files and still keeping the structures pretty clear.

Shomaa · Post by **Shomaa** » Fri Apr 17, 2009 5:17 pm

we load many parts via XML ,
it's the easiest mtehod for applying the physic engine on the scene and twinking the scene.

hybrid · Post by **hybrid** » Fri Apr 17, 2009 8:43 pm

Well, e.g. the stairs look absolutely perfect, but I don't know if everything's correct. I guess you should try to port your project to SVN/trunk version to test it, or provide the scene loader (do you use a .irr file?)

Shomaa · Post by **Shomaa** » Sat Apr 18, 2009 2:07 pm

After several try ,the resultat is still the same, the z axis is reverted ,and worst ,the collada meshes doesnt support several texture anymore...

http://picasaweb.google.com/lh/photo/nK ... directlink

i post my code here, it's for loading a collada file with several textures :

Code: Select all

	IAnimatedMesh	*anim = this->_engine->GetSmgr()->getMesh("media/pack/Character/NPC/Haruhi_npc/Ai_npc01.dae");

		ISceneNode* node = this->_engine->GetSmgr()->addAnimatedMeshSceneNode(anim);
		node->setMaterialTexture(0,this->_engine->GetDriver()->getTexture(
			"media/pack/Character/NPC/Sourceimages/Character/Ai_Shadow_01.png"));
		node->setMaterialTexture(1,this->_engine->GetDriver()->getTexture(
			"media/pack/Character/NPC/Sourceimages/Character/Ai_npc01.png"));
		node->setMaterialTexture(2,this->_engine->GetDriver()->getTexture(
			"media/pack/Character/NPC/Sourceimages/Character/Ai_npc01_Eyes.png"));
		node->setMaterialTexture(3,this->_engine->GetDriver()->getTexture(
			"media/pack/Character/NPC/Sourceimages/Character/Ai_npc01_Mouth_01.png"));
		node->getMaterial(0).MaterialType = irr::video::EMT_TRANSPARENT_ALPHA_CHANNEL;
node->getMaterial(1).MaterialType = irr::video::EMT_SOLID;
		node->getMaterial(2).MaterialType = irr::video::EMT_TRANSPARENT_ALPHA_CHANNEL;
		node->getMaterial(3).MaterialType = irr::video::EMT_TRANSPARENT_ALPHA_CHANNEL;
		node->setMaterialFlag(irr::video::EMF_LIGHTING,false);
		this->_player[_nb_player_current]->SetPlayerNode(node);

hybrid · Post by **hybrid** » Sun Apr 19, 2009 12:07 am

You should note that the Collada loader always creates a scene, not just a single mesh. So be sure you find the proper node when changing the material. At least the NPC is loading properly with latest SVN/trunk. You should try to export the normals, though, because right now the mesh looks not nice when being lit.

Shomaa · Post by **Shomaa** » Tue Apr 21, 2009 1:48 pm

in my last post, I compiled the project with the lastest Irllicht (SVN/Trunk)
and the picture is the result of this operation...
how do you apply correctly the texture ?
Can you show a piece of your code ,please ?

hybrid · Post by **hybrid** » Tue Apr 21, 2009 2:57 pm

I simply choose the dae file in the meshviewer example 9. This loads the NPC without problems, textures are automatically loaded.

Shomaa · Post by **Shomaa** » Wed Apr 22, 2009 12:12 pm

I found my first error:
because the file is a .DAE, you must add the flag video::EMF_FRONT_FACE_CULLING , for avoid the blink of texture (because the mesh is one textured...)
but the second problem remain here the screenshot :
http://picasaweb.google.com/lh/photo/xC ... directlink

the mesh is still inverted...

hybrid · Post by **hybrid** » Thu Apr 23, 2009 8:10 am

This still sounds as if your library doesn't load the collada as the latest SVN/trunk does. I did not change a thing to the mesh settings, just laoded it with the meshviewer (example 9) and latest SVN/trunk.