Order of data in vertex?
Author
I want to load a mesh into a direct3dx mesh object and then be able to lock it's vertex buffer and get the data in it. For that to work I need to get the FVF that was used when building the vertex buffer, and that's no problem with GetFVF(). I get the total size of the FVF with D3DXGetFVFVertexSize(). But I would like to know in what order the data is in, so I can parse it.
Any ideas?
Vertex data that is compatible with the fixed function pipeline has it's elements arranged in the same order. So if the FVF had D3DFVF_XYZ then that would always be first, and textures would always be last. There used to be a page in the sdk docs about the order in which fvf data must be declared in, but I can't find it anymore. Off the top of my head however it's
xyz or xyzrhw (cant have both)
normal
point size
color
specular
tex coordinates
xyz or xyzrhw (cant have both)
normal
point size
color
specular
tex coordinates
While it is possible to calculate the component's offsets manually (like IFooBar said), D3DX already has a function for this purpose - D3DXDeclaratorFromFVF(). It returns an array of D3DVERTEXELEMENT9 structures, which contain comprehensive info about the vertex components, including their offsets.
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