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Grass rendering

Started by TohaTalib Jan 12, 2007 at 10:45 AM 5 replies 1.1k views

Original Post

Jan 12, 2007 at 10:45 AM

I am trying to render a large amount of plants on my terrain engine but correct alpha blending needs objects sorting to camera position. This hardly kills my FPS. Please help! What render states can I use for correct blending with switched on state ZWRITEENABLED, and withaout manual objects sorting?

sirob

105

sirob

Jan 12, 2007 at 11:39 AM

You could try using AlphaTesting, but not AlphaBlending. AlphaTesting doesn't require Z-Sorted geometry.

Todo

Jan 12, 2007 at 11:41 AM

Alpha dithering is a very common solution that doesn't require geometry sorting, at the expense of quality. There's an excellent article about it in GPU Gems 2, but googling may yield similar answers. I'm sorry but I can't help you any further since I don't know specific details myself.

EDIT: in regards to the previous poster, this is related to alpha testing.

soconne

107

soconne

Jan 12, 2007 at 5:56 PM

Quote:
Original post by Anonymous Poster
another approach is to render a alphaTest pass and then a alphablended pass (to blend the edges a little bit more). Although the blended edges are not sorted correctly, they mostly add to a blending/fade effect along the edges and are not very noticeable.

That's what I've done and it looks very nice, almost the same as regular z-sorted alpha blending.

TohaTalib

Author

TohaTalib

Jan 15, 2007 at 9:09 AM

Thanks guys, it realy WORKS!!!

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