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One 3d model - different shaders?

Started by MrSparkle Jun 28, 2006 at 2:50 AM 2 replies 450+ views

Original Post

Jun 28, 2006 at 2:50 AM

Hi, I'm new to this game development topic and I'm looking for some assistance... My question is about DirectX models and shaders, and how it is possible to assign different shaders to the model's polygons. E.g., when I have a model of a building and I want to assign different shaders to the windows, doors and stone walls, do I have to split the model and create a single object for each window and door? Or is there an easier way? Thanks, Christian

ET3D

Jun 28, 2006 at 7:57 AM

You have to make different drawing calls for different shaders. You can still keep the data in the same vertex buffer, if you want. If you're using D3DX meshes, you might create parts with different materials and draw them as subsets. In some cases it could be good to use different objects. For example, if your doors or windows can open, then it makes sense to make them separate. (You can reuse objects, for example have one window object and draw it several times at different places.)

MrSparkle

Jul 3, 2006 at 1:40 PM

Hi,

I noticed that the Panda DirectX Exporter actually exports the MaterialIDs of the object's polygons. I wonder how I can access them in my GameEngine to render them with different shaders.
Can anyone help me with this problem?

Thanks,
Christian

DXnut

Jul 3, 2006 at 11:16 PM

If you have different materials, then your mesh should have different subsets defined for each. So,before you do each pMesh-DrawSubset(x) call, you can setup your effect or vertex/pixel shaders to what ever you want to use.

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