Mantaflow > Liquid: Enabling Initial Velocity on Inflow / Outflow crashes Blender #73311

New Issue

Wykrhm Reddy · 2020-01-22T10:30:22+01:00

Wykrhm Reddy commented

2020-01-22 10:30:22 +01:00

System Information
Operating system: Windows-10-10.0.17763-SP0 64 Bits
Graphics card: GeForce GTX 980/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 441.87

Blender Version
Broken: version: 2.83 (sub 1), branch: master, commit date: 2020-01-21 21:00, hash: ddda1af97a
Worked: (optional)

Short description of error
Trying to enable the Initial Velocity option on Inflow / Outflow tabs crashes Blender. Older blend files that have this option enabled also crash Blender upon load.

Exact steps for others to reproduce the error

Create An Object. Enable Fluid and set it to Domain.
Create Another Object.
Enable Fluid
Flow Type: Liquid
Flow Behavior: Inflow or Outflow
Try to enable > Initial Velocity.
Crash.

A Test Blend to repro the crash is available here: https://developer.blender.org/F8294458

**System Information** Operating system: Windows-10-10.0.17763-SP0 64 Bits Graphics card: GeForce GTX 980/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 441.87 **Blender Version** Broken: version: 2.83 (sub 1), branch: master, commit date: 2020-01-21 21:00, hash: `ddda1af97a` Worked: (optional) **Short description of error** Trying to enable the Initial Velocity option on Inflow / Outflow tabs crashes Blender. Older blend files that have this option enabled also crash Blender upon load. **Exact steps for others to reproduce the error** - Create An Object. Enable Fluid and set it to Domain. - Create Another Object. - Enable Fluid - Flow Type: Liquid - Flow Behavior: Inflow or Outflow - Try to enable > Initial Velocity. - Crash. A Test Blend to repro the crash is available here: https://developer.blender.org/F8294458

Wykrhm Reddy commented

2020-01-22 10:30:22 +01:00

Added subscriber: @Wyk

Jacques Lucke commented

2020-01-22 10:55:47 +01:00

Added subscriber: @JacquesLucke

Jacques Lucke commented

2020-01-22 10:55:47 +01:00

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

Jacques Lucke commented

2020-01-22 10:55:47 +01:00

Seems to work for me in the latest build.
Can you provide a simple .blend file, that is saved right before crash happens?

Seems to work for me in the latest build. Can you provide a simple .blend file, that is saved right before crash happens? ![image.png](https://archive.blender.org/developer/F8294452/image.png)

Wykrhm Reddy commented

2020-01-22 10:59:15 +01:00

Hey Jacques,

Here's a blend file. Trying to enable the Initial Velocity option on the Circle object crashes Blender.

Blend File: test.blend

Hey Jacques, Here's a blend file. Trying to enable the Initial Velocity option on the Circle object crashes Blender. Blend File: [test.blend](https://archive.blender.org/developer/F8294458/test.blend)

Jacques Lucke commented

2020-01-22 11:02:17 +01:00

I can reproduce it in that file, thanks. Apparently, you also hat to setup a domain object to make it crash (if I remove it, it does not crash). Please update the initial post to include all the steps needed to reproduce this crash. Also put a link to the file in the initial post.

Wykrhm Reddy commented

2020-01-22 11:05:18 +01:00

Ah. I updated the OP with the necessary details and link to the blend file. Thanks for looking into it.

Sebastián Barschkis was assigned by Jacques Lucke

2020-01-22 11:05:53 +01:00

Jacques Lucke commented

2020-01-22 11:05:53 +01:00

_PyUnicode_AsUTF8String(PyObject * unicode, const char * errors) (/home/sergey/Developer/build_linux/deps/build/python/src/external_python/Objects/unicodeobject.c:5188)
pyObjectToString(PyObject * inputObject) (/home/jacques/blender-git/blender/intern/mantaflow/intern/MANTA_main.cpp:2058)
MANTA::updatePointers(MANTA * const this) (/home/jacques/blender-git/blender/intern/mantaflow/intern/MANTA_main.cpp:2577)
manta_ensure_invelocity(MANTA * fluid, FluidModifierData * mmd) (/home/jacques/blender-git/blender/intern/mantaflow/intern/manta_fluid_API.cpp:59)
update_flowsflags(FluidDomainSettings * mds, Object ** flowobjs, int numflowobj) (/home/jacques/blender-git/blender/source/blender/blenkernel/intern/fluid.c:2577)
BKE_fluid_modifier_processDomain(FluidModifierData * mmd, Depsgraph * depsgraph, Scene * scene, Object * ob, Mesh * me, const int scene_framenr) (/home/jacques/blender-git/blender/source/blender/blenkernel/intern/fluid.c:3532)
BKE_fluid_modifier_process(FluidModifierData * mmd, Depsgraph * depsgraph, Scene * scene, Object * ob, Mesh * me) (/home/jacques/blender-git/blender/source/blender/blenkernel/intern/fluid.c:3804)
BKE_fluid_modifier_do(FluidModifierData * mmd, Depsgraph * depsgraph, Scene * scene, Object * ob, Mesh * me) (/home/jacques/blender-git/blender/source/blender/blenkernel/intern/fluid.c:3816)

Looks like callPythonFunction unexpectedly returns null.

``` _PyUnicode_AsUTF8String(PyObject * unicode, const char * errors) (/home/sergey/Developer/build_linux/deps/build/python/src/external_python/Objects/unicodeobject.c:5188) pyObjectToString(PyObject * inputObject) (/home/jacques/blender-git/blender/intern/mantaflow/intern/MANTA_main.cpp:2058) MANTA::updatePointers(MANTA * const this) (/home/jacques/blender-git/blender/intern/mantaflow/intern/MANTA_main.cpp:2577) manta_ensure_invelocity(MANTA * fluid, FluidModifierData * mmd) (/home/jacques/blender-git/blender/intern/mantaflow/intern/manta_fluid_API.cpp:59) update_flowsflags(FluidDomainSettings * mds, Object ** flowobjs, int numflowobj) (/home/jacques/blender-git/blender/source/blender/blenkernel/intern/fluid.c:2577) BKE_fluid_modifier_processDomain(FluidModifierData * mmd, Depsgraph * depsgraph, Scene * scene, Object * ob, Mesh * me, const int scene_framenr) (/home/jacques/blender-git/blender/source/blender/blenkernel/intern/fluid.c:3532) BKE_fluid_modifier_process(FluidModifierData * mmd, Depsgraph * depsgraph, Scene * scene, Object * ob, Mesh * me) (/home/jacques/blender-git/blender/source/blender/blenkernel/intern/fluid.c:3804) BKE_fluid_modifier_do(FluidModifierData * mmd, Depsgraph * depsgraph, Scene * scene, Object * ob, Mesh * me) (/home/jacques/blender-git/blender/source/blender/blenkernel/intern/fluid.c:3816) ``` Looks like `callPythonFunction` unexpectedly returns `null`.

Jacques Lucke commented

2020-01-22 11:09:16 +01:00

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