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Regression in BVH building/Synchronize
Closed, ResolvedPublic

Description

System Information
Linux Mint 17.3, NV Driver 375.26, 64bit

Blender Version
Broken: 5552e83b5338, possibly earlier
Worked: 2.78b release

Short description of error
Building bvh tree/sychronizing takes forever ( killed after 7 min, perhaps never finished, typically should be < 2minutes here )

Exact steps for others to reproduce the error
Get Victor bench, try render. ( cpu or gpu does not matter )

Jens

Event Timeline

Sergey Sharybin (sergey) triaged this task as Normal priority.

To be more precise:
I disabled renderability of multires/subsurf for some "critical"
objects ( GEO_tree_sculpt and GEO_rocked_detailed ) and the sychronize is way faster an i came to render again.
Also: Exactly whats stallling is only the "synchronize" part.

Jens

Did some more investigation and extracted a simplified testcase from victor. It consist only one tree + material. The hang goes away if you either disable multires or cut both pointiness routes !

Jens

Okay, the bell rang loud here so i checkout one commit before "fd7e9f7 Cycles: Fix pointiness attribute giving wrong results with autosplit" and this worked again. So the culprit is found and the task attached to the right person :P

Broken: commit fd7e9f7

Jens