[Bf-cycles] Blender Viewport performance issue after Cycles render (since changing to CUDA Toolkit 5.0)
db4tech at yahoo.co.uk
Sun Jun 23 17:36:45 CEST 2013
Just discovered an interesting issue, seems to have been introduced
since Blender changed to CUDA Toolkit 5.0. Not related to Cycles render
speeds, which consequently have received a great boost after code
re-factoring. Issue is connected with Viewport performance after
performing a Cycles render.
*Issue outlined below:*
Upon opening a complex scene, with a heavy particle system (particles
Viewport setting of 1, Child particles 0), Viewport navigation (VOBs
enabled) with an Intel HD 4000 (part of i7 CPU) is extremely fluid, like
30fps or more, (much slower on GTX 580 due to double sided Normals
With recent Blender versions, everything is fine until a F12 Cycles
render is performed (does not happen with Viewport render), after which
Viewport navigation becomes extremely sluggish, feels like 2fps. Hiding
the heavy particle object returns full Viewport performance, once object
is unhidden Viewport is back to a crawl. Closing and opening Blender
with the same scene and everything is back to normal, until the next F12
render is performed.
Blender versions prior to Toolkit 5.0 changes, Viewport performance
remains just as fluid after a F12 Cycles render, also tested Blender 2.67b.
Today's BuildBot version (official) blender-2.67-r57660-win64 produces
the sluggish Viewport issue after a F12 Cycles render.
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