[Bf-committers] profiling subsurf

[Ton Roosendaal]

Hi Brecht, Ben,

I've done some profiling tests, and found out that subsurf is slowest  
in generating UV maps and in subdividing vertexgroups. That's both  
features we could make optional... and probably the same for Sticky and  
other custom layers. This is usually not needed for 3d editing.

Problem is that sometimes you do require vertexgroups, like for  
particle (hair) systems.
Nevertheless, also for hair you want to get interactive editing in a 3D  
window.

Derivedmesh already has flags to indicate 'render quality', so probably  
we can use this flag for triggering subdivision of custom layers (apart  
from vertex locations).
To facilitate modifiers to keep working on subsurf levels, you then can  
just copy the layer info (from nearest vertex or so).

So, could this work? I've tried to get into the subsurf code myself,  
but it's scary :)

-Ton-


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Ton Roosendaal  Blender Foundation ton at blender.org  
http://www.blender.org