Geometry Nodes not using `MeshSequenceCache` data while rendering #112075

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opened 2023-09-07 11:14:57 +02:00 by Amélie Fondevilla · 9 comments

Amélie Fondevilla commented

2023-09-07 11:14:57 +02:00

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System Information
Operating system: Linux-5.4.0-153-generic-x86_64-with-glibc2.31 64 Bits, X11 UI
Graphics card: NVIDIA GeForce GTX 1080/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 510.47.03

Blender Version
Broken: version: 3.6.2, branch: blender-v3.6-release, commit date: 2023-08-16 16:43, hash: e53e55951e7a
Worked: (newest version of Blender that worked as expected)

Short description of error
During the rendering, the geometry contained in the Object Info node in geometry nodes does not take into account MeshSequenceCache modifiers of the corresponding object.

Exact steps for others to reproduce the error
Here is a simple blender file containing a 3D animated sketch made in VR with Quill, and imported through an Alembic file : bug_mesh_cache_geo_node.blend.
The sketch has 2 keyframes, with each exactly one stroke.

A geometry node is applied to the mesh to add a sphere at the position of the first vertex of the curves.

A rendering of the second keyframe (frame 10 for example) shows that the geometry node is using the data of the first keyframe of the curve, since the sphere is located at the beginning of the curve in the first keyframe.

**System Information** Operating system: Linux-5.4.0-153-generic-x86_64-with-glibc2.31 64 Bits, X11 UI Graphics card: NVIDIA GeForce GTX 1080/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 510.47.03 **Blender Version** Broken: version: 3.6.2, branch: blender-v3.6-release, commit date: 2023-08-16 16:43, hash: `e53e55951e7a` Worked: (newest version of Blender that worked as expected) **Short description of error** During the rendering, the geometry contained in the `Object Info` node in geometry nodes does not take into account `MeshSequenceCache` modifiers of the corresponding object. **Exact steps for others to reproduce the error** Here is a simple blender file containing a 3D animated sketch made in VR with Quill, and imported through an Alembic file : [bug_mesh_cache_geo_node.blend](/attachments/17ebf72a-d8a2-41e3-aa74-815e0fc7fe7c). The sketch has 2 keyframes, with each exactly one stroke. A geometry node is applied to the mesh to add a sphere at the position of the first vertex of the curves. ![geonode.png](/attachments/4edff0ba-d945-43cb-8a93-6b628bb49c72) A rendering of the second keyframe (frame 10 for example) shows that the geometry node is using the data of the first keyframe of the curve, since the sphere is located at the beginning of the curve in the first keyframe. ![diff_viewport_rendering.png](/attachments/6de0c26f-5123-483e-8dd1-4e9d784cdfb9)

Brush_anim.abc

132 KiB

geonode.png

186 KiB

diff_viewport_rendering.png

634 KiB

bug_mesh_cache_geo_node.blend

1.0 MiB

Amélie Fondevilla added the

labels 2023-09-07 11:14:57 +02:00

Pratik Borhade commented

2023-09-07 12:47:01 +02:00

Member

Thanks for the report. I can confirm.

Thanks for the report. I can confirm.

Pratik Borhade added

Nodes & Physics

and removed

labels 2023-09-07 12:47:26 +02:00

Pratik Borhade commented

2023-09-07 12:52:03 +02:00

Member

Probably related to #58704

Probably related to #58704

Amélie Fondevilla commented

2023-09-07 13:07:24 +02:00

Author

Member

Yes, probably.. I suspected it was such kind of issue. I guess there's no hope to solve this then ?
I guess it would be nice to at least have a workaround on this. For example be able to bake the MeshSequenceCache, even if it means creating multiple objects, idk.

Yes, probably.. I suspected it was such kind of issue. I guess there's no hope to solve this then ? I guess it would be nice to at least have a workaround on this. For example be able to bake the MeshSequenceCache, even if it means creating multiple objects, idk.

Pratik Borhade commented

2023-09-07 13:17:33 +02:00

Member

Maybe @dr.sybren has an idea about the possible workaround if problem is related to Alembic

Maybe @dr.sybren has an idea about the possible workaround if problem is [related to Alembic](https://projects.blender.org/blender/blender/wiki/Module:%20Pipeline,%20Assets%20&%20I/O#:~:text=%23alembic,%40dr.sybren)

Iliya Katushenock commented

2023-09-07 13:38:54 +02:00

Member

@amelief Can you check, if you add Scene Time node to node tree, have this fix bug?

@amelief Can you check, if you add `Scene Time` node to node tree, have this fix bug?

Amélie Fondevilla commented

2023-09-07 14:16:09 +02:00

Author

Member

hi @mod_moder
You mean adding the Scene Time somewhere in the geometry nodes so that it gets evaluated ?

This :

does not solve the issue, but I am not sure that is what you suggested.

hi @mod_moder You mean adding the `Scene Time` somewhere in the geometry nodes so that it gets evaluated ? This : ![geonode_scene_time.png](/attachments/73033ecc-3e7c-4baf-a6f8-b557d0e7783c) does not solve the issue, but I am not sure that is what you suggested.

geonode_scene_time.png

232 KiB

Iliya Katushenock commented

2023-09-07 14:17:47 +02:00

Member

@amelief No need to connect to something, just existing is enough

@amelief No need to connect to something, just existing is enough

Sybren A. Stüvel commented

2023-09-11 13:05:06 +02:00

Member

Is it known whether this is any of these issues?

GN doesn't evaluate on the next frame
GN does evaluate, but caches the output of the Mesh Cache Sequence modifier (MCSM)
GN does evaluate, but asks MCSM for geometry on the wrong frame/timecode
GN does evaluate, and asks MCSM for geometry, but the modifier doesn't realise things are animated, and thus always returns the same thing

Is it known whether this is any of these issues? - GN doesn't evaluate on the next frame - GN does evaluate, but caches the output of the Mesh Cache Sequence modifier (MCSM) - GN does evaluate, but asks MCSM for geometry on the wrong frame/timecode - GN does evaluate, and asks MCSM for geometry, but the modifier doesn't realise things are animated, and thus always returns the same thing

fuzheren commented

2023-09-11 13:10:03 +02:00

@amelief hey,I also meet this problem but maybe you can try this.(blender 3.6) click this and final render is correct!

@amelief hey,I also meet this problem but maybe you can try this.(blender 3.6) click this and final render is correct!

微信截图_20230911190831.png

57 KiB

微信截图_20230911190831.png

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