[Bf-committers] displist.c, surfaces and buffers

[Matt Ebb]

If I remember correctly, the subsurf code does incremental updates -  
perhaps you could try having a look in there.

cheers

Matt


On 20/11/2007, at 8:23 AM, Emmanuel Stone wrote:

> Hello,
>
> This is a Blender architecture/design question.
>
> In displist.c::makeDispListSurf() :
>
> - The vertex buffer for the tesselated surface is malloc()ed up  
> every time, why?
> - Is it possible to get the old buffer?
>
> ...  displist.c: 1347
> """
> 				dl= MEM_callocN(sizeof(DispList), "makeDispListsurf");
> 				dl->verts= MEM_callocN(len*3*sizeof(float), "dlverts");
> """
>
> libNurbana uses deltas to modify the surface incrementally/on demand,
> which is much faster than recalculating the entire surface for every
> modification. At the moment I am caching the results of the previous
> tesselation internally within libNurbana, but if this data still
> exists somewhere within blender, I would prefer to use that.
>
>
> -Emmanuel
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------------------------------------------
Matt Ebb . matt at mke3.net . http://mke3.net



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