For mapping a cubemap texture, do we need 3 texture coordinates like u,v and w. I can't seem to find such a thing in DX9 documentation?

Without the third element, can we index a mesh into the center of it,  or anywhere between?

	{0, 12, D3DDECLTYPE_FLOAT2, D3DDECLMETHOD_DEFAULT, D3DDECLUSAGE_TEXCOORD, 0},
	

to

	{0, 12, D3DDECLTYPE_FLOAT3, D3DDECLMETHOD_DEFAULT, D3DDECLUSAGE_TEXCOORD, 0},
	

Thanks

Jack

If you mean volume textures, then you need a W.

https://msdn.microsoft.com/en-us/library/windows/desktop/bb206344(v=vs.85).aspx

If you mean a cubemap, then no, the cube texture itself is flat and you only need U and V.

https://en.wikipedia.org/wiki/Cube_mapping#/media/File:Skybox_example.png

Thanks buddy

59 minutes ago, Hodgman said:

Cube textures aren't flat; cube textures are a cube. The texture coordinate is a 3D vector pointing in the direction of the texel you'd like to sample...

I stand corrected.   It looks like the vector-to-sampler-address step is done for us.

Using Hodgman's hints, I found this which seems relevant:  https://msdn.microsoft.com/en-us/library/windows/desktop/bb204881(v=vs.85).aspx

But how to tell the difference between u,v and u,v,w in this case?

DWORD VertexPosNormTexFVF = D3DFVF_XYZ | D3DFVF_NORMAL | D3DFVF_TEX0;

Sorry, I overwrote the texture buffer instead, and I've already cloned the mesh... but a new problem arises,

when I map the volume texture over a box, what I get is a "block" of fire, do I change the vertex buffer to get a better look of fire inferno?

Thanks

Jack