I've been posting about this
on the GameDev.new forums (details in that link), but seeing Horde made it so easy to prototype this effect I've got to thank you here
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Just quickly (in case you don't want to read that link
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), this technique involves drawing a grid of quads over the screen. The grid data is static - it's updated by fetching data from a texture in the vertex shader.
Unfortunately my prototype is utterly CPU bound, because I implemented my screen-space quads really quickly with the overlay system:
Code:
for( int y=0; y<appHeight; y+=16 )
{
for( int x=0; x<appWidth; x+=16 )
{
float left, top, bottom, right;
top = bottom = (y+8)/(float)appHeight;
left = right = (x+8)/(float)appWidth;
h3dShowOverlay( left, top, 0, 1, left, bottom, 0, 0, right, bottom, 1, 0, right, top, 1, 1,
1, 1, 1, 1, _bokehMatRes, (x*3+y*2)%5 );
}
}
h3dRender( _cam );
h3dFinalizeFrame();
h3dClearOverlays();
I'm guessing that my best bet will be to procedurally create a H3DG file and mesh/model nodes that contain this vertex data? I can then just place them in my scene as usual, but with a special class name on the material, so the pipeline can render them in the right stage.
Does that sound like the best solution?
Thanks again for the flexible renderer - this prototype would have taken me much longer on some other engines!