Vaclav Cermak wrote:

> 
> Hello,
> 
>   I'am now working on some bitmap based grass, bush etc. I'am trying to 
> place a lot of rectangles with bitmap grass patches on the groud. 
> Bitmaps are partially transparent. The result is, that I have a lot of 
> rectangles on every ray hittng the ground, so I must set very high 
> max_trace_level to render it correctly...

Make a mesh for each unique piece of bitmap.  Don't put triangles except 
where there's grass.

Color the ground like dirt.

When I want to do grass, I generally make a mesh (or a few meshes), 
representing a patch of grass.  The I copy it a bunch of times, with 
rotation and skewing, to eliminate a tiled appearance.

Regards,
John

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