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On 24 Nov 2002 12:02:23 -0500
"Rafal 'Raf256' Maj" <raf### [at] raf256 com> wrote:
>
> I have following problem - I want to cover large area (about 1000x1000
>
> units) by grass, each grass "leaf" tooks about 1 unit space on ground,
> so I wolud need about 1 mln leafs.
> Each leaf is build from about 500 triangles, with gives 500,000,000
> triangles - way to much to hold in memory.
>
> So I thinked of optimisation :
> 1. every grass leaf is a mesh
> 2. organise 10x10 leafs into an union like GrassBlock
> 3. cover area (flat land) with same GrassBlock object
>
> problem is with step #3 - each :
> object { GrassBlock translate <X,0,Z> }
> results in duplicating GrassBlock in memory - so no memroy is saved as
> I aspected.
I had a similar problem with this scene:
http://www.ignorancia.org/images/marjal.jpg
and the less consuming solution was to actually move the
transformations from the grass patchs to the individual triangles, so
you can get a whole mesh for every grass patch, and then you can make a
union of these (with few but bigger meshes). Not that good as the
posibility of nesting meshes, but feasible, and the only solution that
worked for my 512MB.
--
Jaime Vives Piqueres
La Persistencia de la Ignorancia
http://www.ignorancia.org
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