Volume to Mesh modifier on vdb sequence fails when rendering (F12 or animation ctrl-F12) #82393

New Issue

Pedro Anuarbe · 2020-11-04T10:08:35+01:00

Pedro Anuarbe commented

2020-11-04 10:08:35 +01:00

Blender Version
Broken: 2.92.0 Alpha, branch: master, date: 2020-11-03, hash: 3049704b15
Worked: -

Short description of error
The volume to mesh modifier renders correctly in the Viewport but fails when rendering (F12 or animation ctrl-F12)

Exact steps for others to reproduce the error

import an openvdb volume sequence as volume (for example any of https://jangafx.com/software/embergen/download/free-vdb-animations/)
apply 'volume to mesh' modifier to default cube selecting the correct grid

try to render animation with ctrl+F12

#82393.zip

In a debug build, following Assert is triggered

BLI_assert failed: source/blender/blenkernel/intern/modifier.c:420, BKE_modifier_set_error(), at 'BLI_findindex(&ob_orig->modifiers, md_orig) != -1'

**Blender Version** Broken: 2.92.0 Alpha, branch: master, date: 2020-11-03, hash: 3049704b1505 Worked: - **Short description of error** The volume to mesh modifier renders correctly in the Viewport but fails when rendering (F12 or animation ctrl-F12) **Exact steps for others to reproduce the error** - import an openvdb volume sequence as volume (for example any of https://jangafx.com/software/embergen/download/free-vdb-animations/) - apply 'volume to mesh' modifier to default cube selecting the correct grid # try to render animation with ctrl+F12 [#82393.zip](https://archive.blender.org/developer/F9193696/T82393.zip) In a debug build, following Assert is triggered ``` BLI_assert failed: source/blender/blenkernel/intern/modifier.c:420, BKE_modifier_set_error(), at 'BLI_findindex(&ob_orig->modifiers, md_orig) != -1' ```

Pedro Anuarbe commented

2020-11-04 10:08:35 +01:00

Added subscriber: @peancor

Dalai Felinto commented

2020-11-04 11:15:44 +01:00

Added subscribers: @Blendify, @JacquesLucke, @dfelinto

Dalai Felinto commented

2020-11-04 11:15:44 +01:00

This is a limitation of the current system, the moment you apply the modifier to a mesh you loose the animation data.

That said this is not documented in the manual and it doesn't warn the users about it. In fact the volume to mesh modifier is not mentioned on blender/documentation#79215.

@JacquesLucke can you coordinate with @Blendify to have this modifier in the manual? (as in, add it yourself or talk to Aaron about it).

This is a limitation of the current system, the moment you apply the modifier to a mesh you loose the animation data. That said this is not documented in the manual and it doesn't warn the users about it. In fact the volume to mesh modifier is not mentioned on blender/documentation#79215. @JacquesLucke can you coordinate with @Blendify to have this modifier in the manual? (as in, add it yourself or talk to Aaron about it).

Dalai Felinto commented

2020-11-04 11:18:49 +01:00

Changed status from 'Needs Triage' to: 'Needs User Info'

Dalai Felinto commented

2020-11-04 11:18:49 +01:00

@peancor are you sure the mesh object is working animated in the viewport? In my tests here the moment you apply the modifier it convert only the current frame to the mesh.

I can't possibly think of it working differently. I will update the task description accordingly, but I can always roll back the changes.

@peancor are you sure the mesh object is working animated in the viewport? In my tests here the moment you apply the modifier it convert only the current frame to the mesh. I can't possibly think of it working differently. I will update the task description accordingly, but I can always roll back the changes.

Dalai Felinto changed title from ~~Volume to Mesh modifier on vdb sequence not rendering (only renders in viewport)~~ to Volume to Mesh modifier on vdb sequence lack of warning/documentation

2020-11-04 11:22:34 +01:00

Dalai Felinto commented

2020-11-04 11:23:43 +01:00

Thinking of it, there is no warning either for armature modifier (and probably for alembic). I would say just there is no warning needed, but I think we should keep this open until the feature is in the manual.

Jacques Lucke was assigned by Dalai Felinto

2020-11-04 11:24:38 +01:00

Jacques Lucke commented

2020-11-04 11:33:32 +01:00

I also don't know why there should be an extra warning for this specific modifier. Every time you apply any modifier you loose the animation if there was any.

Philipp Oeser commented

2020-11-04 11:36:35 +01:00

Added subscriber: @lichtwerk

Philipp Oeser commented

2020-11-04 11:36:36 +01:00

@dfelinto: could it be that you misunderstood the report?

For me, this sounds like the stuff is not rendering at all with F12 / Ctrl F12 [even if the modifier is still present].
so the wording is a bit misleading, I think "apply 'volume to mesh' modifier to default cube selecting the correct grid" does not really mean apply, more like add

When I try to render, I am getting

BLI_assert failed: source/blender/blenkernel/intern/modifier.c:420, BKE_modifier_set_error(), at 'BLI_findindex(&ob_orig->modifiers, md_orig) != -1'

@dfelinto: could it be that you misunderstood the report? For me, this sounds like the stuff is not rendering at all with F12 / Ctrl F12 [even if the modifier is still present]. so the wording is a bit misleading, I think "apply 'volume to mesh' modifier to default cube selecting the correct grid" does not really mean **apply**, more like **add** When I try to render, I am getting ``` BLI_assert failed: source/blender/blenkernel/intern/modifier.c:420, BKE_modifier_set_error(), at 'BLI_findindex(&ob_orig->modifiers, md_orig) != -1' ```

Dalai Felinto commented

2020-11-04 11:40:05 +01:00

To render you need to setup the materials and all that. Without a sample file (missing all but the openvdb) there is not much that can be done.

Besides, the report refer to animated sequence. I will wait to see if the reporter clarify this further.

To render you need to setup the materials and all that. Without a sample file (missing all but the openvdb) there is not much that can be done. Besides, the report refer to animated sequence. I will wait to see if the reporter clarify this further.

Pedro Anuarbe commented

2020-11-04 11:51:59 +01:00

@dfelinto, @JacquesLucke, @lichtwerk

sorry, the modifier is not applied, It is only added to the mesh. In the viewport the animation renders correctly when i press spacebar but not when i try to render animation (Ctrl+F12).

I have not included an example file because of the size of the vdb sequences.

@dfelinto, @JacquesLucke, @lichtwerk sorry, the modifier is not applied, It is only added to the mesh. In the viewport the animation renders correctly when i press spacebar but not when i try to render animation (Ctrl+F12). I have not included an example file because of the size of the vdb sequences.

Philipp Oeser commented

2020-11-04 11:56:26 +01:00

In #82393#1047885, @dfelinto wrote:
To render you need to setup the materials and all that.
Besides, the report refer to animated sequence.

Not sure what you are trying to say.

I have added an example file to the report.
Without applying any modifier, this is not rendering for me in a Debug build [with beforementioned Assert]

> In #82393#1047885, @dfelinto wrote: > To render you need to setup the materials and all that. > Besides, the report refer to animated sequence. Not sure what you are trying to say. I have added an example file to the report. Without applying any modifier, this is not rendering for me in a Debug build [with beforementioned Assert]

Philipp Oeser changed title from ~~Volume to Mesh modifier on vdb sequence lack of warning/documentation~~ to Volume to Mesh modifier on vdb sequence fails when rendering animation (ctrl-F12)

2020-11-04 11:59:42 +01:00

Philipp Oeser commented

2020-11-04 11:59:42 +01:00

Changed status from 'Needs User Info' to: 'Confirmed'

Dalai Felinto commented

2020-11-04 12:36:57 +01:00

@lichtwerk if you render (F12) do you see anything different than when rendering animation? Here I don't see anything in either case.

Philipp Oeser commented

2020-11-04 12:46:08 +01:00

In #82393#1047935, @dfelinto wrote:
@lichtwerk if you render (F12) do you see anything different than when rendering animation? Here I don't see anything in either case.

Nope, F12 / Ctrl+F12 are the same, will correct report description

> In #82393#1047935, @dfelinto wrote: > @lichtwerk if you render (F12) do you see anything different than when rendering animation? Here I don't see anything in either case. Nope, F12 / Ctrl+F12 are the same, will correct report description

Philipp Oeser changed title from ~~Volume to Mesh modifier on vdb sequence fails when rendering animation (ctrl-F12)~~ to Volume to Mesh modifier on vdb sequence fails when rendering (F12 or animation ctrl-F12)

2020-11-04 12:46:40 +01:00

Pedro Anuarbe commented

2020-11-04 12:57:08 +01:00

@lichtwerk , @dfelinto . If you change one property in the volume (for example turning the 'sequence' checkbox off and on) it usually renders the still image but not the animation.

Jacques Lucke commented

2020-11-04 12:57:28 +01:00

I have a fix for master already, but got a seemingly unrelated crash in the example file in the release branch, checking that now.

blender-admin commented

2020-11-04 13:21:43 +01:00

This issue was referenced by cfcdae5549

This issue was referenced by cfcdae5549f37198fa8e66ee512f1093764ef022

Jacques Lucke commented

2020-11-04 13:22:45 +01:00

Changed status from 'Confirmed' to: 'Resolved'

Jacques Lucke closed this issue

2020-11-04 13:22:45 +01:00

Thomas Dinges added this to the 2.91 milestone 2023-02-08 16:20:08 +01:00

Sign in to join this conversation.

No Label

Download

What's New

Blender Studio

Manual

Developers Blog

Documentation

Benchmark

Blender Conference

Development Fund

One-time Donations

Volume to Mesh modifier on vdb sequence fails when rendering (F12 or animation ctrl-F12) #82393

try to render animation with ctrl+F12