[Bf-cycles] MAX_CLOSURE limit

Brecht Van Lommel brechtvanlommel at pandora.be
Tue Jul 30 01:32:09 CEST 2013

I think this can be increased. The limit was quite low initially
because increasing it made CUDA render slower, but last time I
increased it there wasn't actually any performance difference, so
probably it can be increased further without problems. Just do a quick
test to confirm that it has no or very minimal impact and then you can
increase the limit.

The extra memory usage is probably not an issue, it's just a few KB
per thread I guess.

On Tue, Jul 30, 2013 at 12:20 AM, Thomas Dinges <blender at dingto.org> wrote:
> Hi Brecht,
> today I got a blend file from a friend, which has a lot of closure nodes
> in one tree.
> It's some kind of dispersion node setup with lots of shaders, about 30
> glass shaders, combined with about 30 add shaders.
> The problem here is, that after some amount of add closures, it just
> ignores more. I checked the code and increased MAX_CLOSURE to 32, which
> then allows Cycles to use more of that tree.
> Maybe this kind of setup can be achieved differently, without using that
> many closures.
> I guess it's a corner case, otherwise we would have gotten bug reports
> about that limit before.
> Anyway, would there be problems with increasing MAX_CLOSURE? As it's
> used for our ShaderClosure struct, probably a higher memory footprint?
> I will check if I can upload the .blend file later, if needed.
> Best regards,
> Thomas
> --
> Thomas Dinges
> Blender Developer, Artist and Musician
> www.dingto.org
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