new depsgraph removes the grass in victor scene #51977
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Reference: blender/blender#51977
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System Information
Win 7 x64, cpu and gpu render
Blender Version
Broken:
f9963f2
Short description of error
all in title, enabling --enable-new-depsgraph make the grass to not render in the victor scene.
Exact steps for others to reproduce the error
start blender with --enable-new-depsgraph, open victor scene from benchmark pack, render: there is no grass. Do the same with old depsgraph, it renders coreectly.
Changed status to: 'Open'
Added subscriber: @bliblubli
victor_cpu simple2.blend
Added subscriber: @Sergey
Developer note.
The issue is caused by new dependency graph not doing any extra updates tag when evaluating scene for newframe, while old dependency graph was tagging objects for update in various situations. One of such situations is tagging object for update on frame change when it has particle system (no matter enabled or disabled).
Now, in the file we've got situation, when object has Hair particle system which duplicates grass. This particle system is disabled in viewport.
What happens with old dependency graph:
OB_DUPLI
flag set to OFF, since there is nothing being duplicated.DAG_scene_update_flags
),OB_DUPLI
flag on ground object.What happens with new dependency graph:
OB_DUPLI
flag set to OFF, since there is nothing being duplicated.OB_DUPLI
flag on the object.Here is even smaller version of file untitled.blend
This issue was referenced by
1e21778261
Changed status from 'Open' to: 'Resolved'
After further investigation, not only the hidden particle system is triggering problems. In old depsgraph, it the subdivision modifier is also hidden, the particle system is evaluated, but at the wrong place. Only solution is to manually make it visible in viewport and change something that triggers a new evaluation many times, until it updates (like setting the particle system on and off. In some case, it has to be done 3 or 4 time to really update the particles positions)
This is the correct render after the hack explained above
This is the old depsgraph with modifiers evaluated in the wrong order
This with new depsgraph enabled:
bug part new depsgraph.blend
Changed status from 'Resolved' to: 'Open'
Changed status from 'Open' to: 'Resolved'
opened new task instead https://developer.blender.org/T51997