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Reusing VBs across multiple streams

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Can you have a single VB as the datasource for more than one stream at once? Say I''m rendering keyframe-based models, using a vertex shader to smoothly interpolate between positions in this frame and positions in the next. I put all my texture coordinate and diffuse color data into a single vertex buffer; but what about the position data? I *could* create a VB for each frame, and then pick out the two VBs for the current render and plug them into streams... but would it be possible, instead, to just create a single VB, and SetStreamSource() it twice with different start positions?

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It's not setting the streamsource, its the offset in Draw(Indexed)Primitive that allows this to happen.

Kinda like this

DrawPrimitive(D3DPT_TRILIST,0,3); starts at vertic 0, and draws 3 triangles;

DrawPrimitive(D3DPT_TRILIST,6,3); starts at vertex 6, and draws 3 triangles.

EDIT: THIs code was for example.

in SetStreamSource, you can set the offset between where you draw next too.

Same with DrawIndexedPrimitive, there is a stride parm.

[edited by - RhoneRanger on April 9, 2004 9:48:35 PM]

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