vertex ordering opengl cal3d

[Gorgon Zola]

Hi
I'm working on a Cal3d SceneNode and have come to a problem I don't completely understand.

the following screenshot should show a paladin wallking around.
notice the jitter on the skin? it seems that the triangles are drawn the wrong way (wrong rotation or something).




if i view the same paladin in the modelviewer provided with cal3d there's no problem




i'am using opengl in irrlicht and in the cal3d modelviewer but irrlicht seems to configure something that shuffels the vertex order?
eric (an irrlicht user) had the idea that it might have something to do with different coordinate systems - left-handed vs. right-handed. but i don't know where/how i can circumvent this.

if anyone has any idea where i could start looking for the error please let me know, i don't have any clue where i should start searching

thanks
tom

[Gorgon Zola]

Yeah, did it. If anybody is interested in the scenenode just send me a mail

[joy]

Could you shortly summerize what the solution or the mistake was?

[Gorgon Zola]

Could you shortly summerize what the solution or the mistake was?

It was a type confusion with the vertex indextable. So, irrlicht is completely innocent

In Cal3D you can get the index array for the faces with the following code

Code: Select all

CalIndex meshFaces[50000][3];
int faceCount =pCalRenderer->getFaces(&meshFaces[0][0]);

The typedef for 'CalIndex' is either a 'unsigned short' or an 'int'. I didn't know that because visual studio only showed me the 'unsigned short' typedef with intellisense . So i assumed that the typecast '(const irr::u16*)meshFaces' would be enough to let the mesh draw.
Well, it wasn't!
So, i decided to use an irrlicht meshbuffer and what do you think - it suddenly worked

Code: Select all

mb.Indices.clear();
for(int i=0; i<faceCount; ++i)
{
  mb.Indices.push_back(meshFaces[i][0]);
  mb.Indices.push_back(meshFaces[i][1]);
  mb.Indices.push_back(meshFaces[i][2]);
}

Now, for the lefthanded versus righthanded coordinate problem:
this doesn't affect the rendering in the local way (triangle scattering or what ever) but in a global way, rotations are the oposit way round and vertecis are mirrored.

I hope this helps prevent similar errors

[Manakel166]

If i remember well , Cal3d is using D3D style matrix which is the opposite of OpenGL matrix
In one informations are given row by row and for the other they are given col by col.

Anyway, i would love to have a look on you cal3dscene node , did you use Server classes for Models Caching?

my mail is woody 66 G at AOL COM

[warui]

Why not put the code on the website ? http://www.eve-corp.com/ provides free hosting for irrlicht projects.