[Bf-cycles] Shape Key drivers - bug of sorts

Brecht Van Lommel brechtvanlommel at pandora.be
Mon Sep 19 15:18:11 CEST 2011


Issue confirmed here, it's related to the pepper branch merge, is on
the bug list now, will fix.


On Sun, Sep 18, 2011 at 6:05 AM, Ben Dansie <bendansie at hotmail.com> wrote:
> Hi all,
> I couldn't remember if there was a more official/appropriate place to post
> about bugs yet, but I've found one in recent builds. I can't remember which
> build revision this became a problem with sorry. The issue is to do with
> viewport rendering mode and shape key drivers. When a shapekey driver (or
> multiple) is present, the bvh is forced to rebuild constantly when in
> Static, or the transformations are constantly sent to the device after the
> first pass with Dynamic, making a pass 1, update transform, pass 1, update
> transform loop of sorts. When rendering with f12, this isn't an issue.
> To make a repeatable test case in a new file:
> Select a suzanne in default .blend file
> Add a shape key (basis) and add another key. Don't even need to change the
> mesh around
> Add a driver to that new key. Don't even need to set the driver to do
> anything, just add one.
> Run viewport renderer - easier to test the problem with Dynamic BVH
> Don't know any code to figure out what the culprit is exactly (like a
> despgraph or whatever), but it would appear that the driver being on the
> mesh is forcing the constant updates, thus forcing Cycles to constantly
> update.
> I'm not trying to animate with the viewport render turned on or anything
> crazy like that. :) But previewing materials on a character set up for
> animation as an example causes the issue.
> Running Windows 7 64bit with a GTX 460 (cuda), but this happens with gpu and
> cpu, so I doubt it is device related.
> Cheers,
> Ben
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