model faces missing/wrong culling

[MrGoodbytes]

I have a model which looks fine in Blender, but when I try to use it in irrlicht some of the faces are gone. If I move inside the model, they reappear. I have tried setAutomaticCulling(EAC_OFF), but there is no difference.
The code I am using to load the model is this:

Code: Select all

IMesh *testm = g->scene->getMesh("model.obj");
IMeshSceneNode *test = g->scene->addMeshSceneNode(testm);

Any suggestions?

[mongoose7]

test->setMaterialFlag(video::EMF_BACK_FACE_CULLING, false);

The winding of your vertices is not correct, so you should render front-facing triangles AND back-facing triangles.

[MrGoodbytes]

Thanks! Works perfectly now.

[CuteAlien]

You can also fix it in blender by ensuring all normals go towards the outside of the model. Which is better for performance as you can then keep backface culling enabled in Irrlicht.

[mongoose7]

You know it has nothing to do with the normals, right?

[CuteAlien]

I thought the winding order of vertices on export is set by the normal direction you use inside Blender. Or am I wrong there? I'm not much of a modeller, but that's how I remember it...

[Foaly]

As far as I know the exporters in blender determine the index order based on the normals, as there is no way to set it explicitly in Blender.
So it has to do with the normals.