Mantaflow liquid collisions not working properly #85214

New Issue

James Tomkinson · 2021-01-29T21:57:30+01:00

James Tomkinson commented

2021-01-29 21:57:30 +01:00

System Information
Operating system: Windows-10-10.0.18362-SP0 64 Bits
Graphics card: GeForce GTX 1050/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 461.40

Blender Version
Broken: version: 2.90.1, branch: master, commit date: 2020-09-23 06:43, hash: 3e85bb34d0
Worked: (newest version of Blender that worked as expected)

Short description of error
Unless a liquid collision effector's Surface Thickness is set to at least 0.5 or set to "Is Planar" it is not used.

Exact steps for others to reproduce the error
I reference two examples for liquid and smoke+fire [examples ]] and there are several issues logged in Blender stackexchange , along with my [ https://blender.stackexchange.com/a/209934/111042 | investigation .

A collision effector is ignored unless Surface Thickness is set to at least 0.5 or set to "Is Planar". However as docs state Surface Thickness is "Additional area around the effector".

In my first example "liquid collision.blend" the results (show in "liquid collision.png") shows how the extra Surface Thickness effects the liquid that becomes more confined in the container, whereas setting it to less than 0.5 will cause the liquid to fall through the container.

The same is true in the "muzzle*.blend" file where the flash & smoke comes through the collision object unless Surface Thickness is set (incorrectly) to at least 0.5

liquid collision.blend
muzzle flash no projectile.blend

**System Information** Operating system: Windows-10-10.0.18362-SP0 64 Bits Graphics card: GeForce GTX 1050/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 461.40 **Blender Version** Broken: version: 2.90.1, branch: master, commit date: 2020-09-23 06:43, hash: `3e85bb34d0` Worked: (newest version of Blender that worked as expected) **Short description of error** Unless a liquid collision effector's Surface Thickness is set to at least 0.5 or set to "Is Planar" it is not used. **Exact steps for others to reproduce the error** I reference two examples for liquid and smoke+fire [examples ]] and there are several issues logged in [[ https:*blender.stackexchange.com/search?q=liquid+collision | Blender stackexchange ]], along with my [[ https://blender.stackexchange.com/a/209934/111042 | investigation ](http:*optionpeer.com/jimtpersonal/collisions.zip). A collision effector is ignored unless Surface Thickness is set to at least 0.5 or set to "Is Planar". However as [docs ](https://docs.blender.org/manual/en/latest/physics/fluid/type/effector.html) state Surface Thickness is "Additional area around the effector". In my first example "liquid collision.blend" the results (show in "liquid collision.png") shows how the extra Surface Thickness effects the liquid that becomes more confined in the container, whereas setting it to less than 0.5 will cause the liquid to fall through the container. The same is true in the "muzzle*.blend" file where the flash & smoke comes through the collision object unless Surface Thickness is set (incorrectly) to at least 0.5 [liquid collision.blend](https://archive.blender.org/developer/F9607491/liquid_collision.blend) [muzzle flash no projectile.blend](https://archive.blender.org/developer/F9607492/muzzle_flash_no_projectile.blend) ![liquid collision.png](https://archive.blender.org/developer/F9607493/liquid_collision.png)

James Tomkinson commented

2021-01-29 21:57:30 +01:00

Added subscriber: @jamestomk

James Tomkinson changed title from ~~Mantaflow collisions not working properly~~ to Mantaflow liquid collisions not working properly

2021-01-29 21:58:11 +01:00

Philipp Oeser commented

2021-02-01 12:09:47 +01:00

Added subscribers: @sebbas, @lichtwerk

Philipp Oeser commented

2021-02-01 12:09:47 +01:00

Changed status from 'Needs Triage' to: 'Confirmed'

Philipp Oeser commented

2021-02-01 12:09:47 +01:00

Also not sure I understand collisions correctly in mantaflow:

@sebbas: does the effector need to cover a whole cell?
reason I am asking is:

you can also get it to work if you increase the solidify thickness considerably
you can also get it to work if you increase the domain resolution division considerably

@sebbas: also note that I get two crashes:

opening liquid collision.blend in a Debug build

# Blender 2.93.0, Commit date: 2021-01-31 14:53, Hash b10fac0432c6

# backtrace
./bin/blender(BLI_system_backtrace+0x26) [0xe1066d2]
./bin/blender() [0x3406a50]
./bin/blender() [0x3406c50]
/lib64/libc.so.6(+0x3da60) [0x7f0d20c7ba60]
./bin/blender(_ZN5Manta5ErrorC2ERKSs+0x82) [0xc6e7f4c]
./bin/blender(_ZNK5Manta8GridBase10checkIndexEiii+0x21f) [0xc701087]
./bin/blender(_ZNK5Manta8GridBase5indexEiii+0x2a) [0xc700d5e]
./bin/blender(_ZN5Manta4GridINS_8Vector3DIfEEE3setEiiiRS2_+0x3a) [0xc7af456]
./bin/blender() [0xcabc30e]
./bin/blender(_ZN5Manta14readObjectsVDBERKSsPSt6vectorIPNS_7PbClassESaIS4_EEf+0xd76) [0xcab9c45]
./bin/blender(_ZN5Manta4loadERKSsRSt6vectorIPNS_7PbClassESaIS4_EEf+0x27f) [0xc775768]
./bin/blender() [0xc775cb6]
./bin/blender(_PyMethodDef_RawFastCallKeywords+0x193) [0xcc5d343]
./bin/blender(_PyCFunction_FastCallKeywords+0x28) [0xcc5d538]
./bin/blender() [0x33f9a70]
./bin/blender(_PyEval_EvalFrameDefault+0x4b54) [0x33fe714]
./bin/blender(_PyEval_EvalCodeWithName+0x92d) [0xccfe3dd]
./bin/blender(_PyFunction_FastCallKeywords+0x89) [0xcc5cf79]
./bin/blender() [0x33f9835]
./bin/blender(_PyEval_EvalFrameDefault+0x4b54) [0x33fe714]
./bin/blender() [0x33f859b]
./bin/blender() [0x33f9835]
./bin/blender(_PyEval_EvalFrameDefault+0x4344) [0x33fdf04]
./bin/blender(_PyEval_EvalCodeWithName+0x92d) [0xccfe3dd]
./bin/blender(PyEval_EvalCodeEx+0x3e) [0xccfe65e]
./bin/blender(PyEval_EvalCode+0x1b) [0xccfe68b]
./bin/blender(PyRun_StringFlags+0x8f) [0xcd2f67f]
./bin/blender(_ZN5MANTA15runPythonStringESt6vectorISsSaISsEE+0xd5) [0xc6c5b89]
./bin/blender(_ZN5MANTA8readDataEP17FluidModifierDataib+0x590) [0xc6d52ec]
./bin/blender(manta_read_data+0x2f) [0xc6becfd]
./bin/blender() [0x393c172]
./bin/blender() [0x393c65d]
./bin/blender(BKE_fluid_modifier_do+0x93) [0x393c6f3]
./bin/blender() [0x3f7ab57]
./bin/blender(BKE_modifier_modify_mesh+0xe9) [0x34c4666]
./bin/blender() [0x3890ca8]
./bin/blender() [0x3891ad1]
./bin/blender() [0x3893ca6]
./bin/blender(makeDerivedMesh+0xaa) [0x3894238]
./bin/blender(BKE_object_handle_data_update+0x199) [0x3506c76]
./bin/blender(BKE_object_eval_uber_data+0x8a) [0x35075b4]
./bin/blender(_ZSt13__invoke_implIvRPFvP9DepsgraphP5SceneP6ObjectEJS1_RS3_RS5_EET_St14__invoke_otherOT0_DpOT1_+0x65) [0xcc213dd]
./bin/blender(_ZSt8__invokeIRPFvP9DepsgraphP5SceneP6ObjectEJS1_RS3_RS5_EENSt15__invoke_resultIT_JDpT0_EE4typeEOSC_DpOSD_+0x67) [0xcc1fa5a]
./bin/blender(_ZNSt5_BindIFPFvP9DepsgraphP5SceneP6ObjectESt12_PlaceholderILi1EES3_S5_EE6__callIvJOS1_EJLm0ELm1ELm2EEEET_OSt5tupleIJDpT0_EESt12_Index_tupleIJXspT1_EEE+0xa0) [0xcc1dd7e]
./bin/blender(_ZNSt5_BindIFPFvP9DepsgraphP5SceneP6ObjectESt12_PlaceholderILi1EES3_S5_EEclIJS1_EvEET0_DpOT_+0x41) [0xcc1bcb7]
./bin/blender(_ZSt13__invoke_implIvRSt5_BindIFPFvP9DepsgraphP5SceneP6ObjectESt12_PlaceholderILi1EES4_S6_EEJS2_EET_St14__invoke_otherOT0_DpOT1_+0x37) [0xcc18fd9]
./bin/blender(_ZSt10__invoke_rIvRSt5_BindIFPFvP9DepsgraphP5SceneP6ObjectESt12_PlaceholderILi1EES4_S6_EEJS2_EENSt9enable_ifIX16is_invocable_r_vIT_T0_DpT1_EESF_E4typeEOSG_DpOSH_+0x37) [0xcc1583d]
./bin/blender(_ZNSt17_Function_handlerIFvP9DepsgraphESt5_BindIFPFvS1_P5SceneP6ObjectESt12_PlaceholderILi1EES5_S7_EEE9_M_invokeERKSt9_Any_dataOS1_+0x37) [0xcc128db]
./bin/blender(_ZNKSt8functionIFvP9DepsgraphEEclES1_+0x49) [0xcbee387]
./bin/blender() [0xcbed633]
./bin/blender() [0xcbed679]
./bin/blender(_ZZNK4TaskclEvENKUlvE_clEv+0x34) [0xe10cdbe]
./bin/blender() [0xe10d182]
./bin/blender() [0x398bbe5]
./bin/blender() [0xe10cf6a]
./bin/blender() [0xe10ce93]
./bin/blender(_ZNK4TaskclEv+0x20) [0xe10cde2]
./bin/blender() [0xe10d15e]
./bin/blender() [0x39992e5]
./bin/blender() [0x399959b]
./bin/blender() [0x398b8f7]
./bin/blender() [0x3993060]
./bin/blender() [0x399506c]
./bin/blender() [0x3995269]
/lib64/libpthread.so.0(+0x93f9) [0x7f0d213c73f9]
/lib64/libc.so.6(clone+0x43) [0x7f0d20d3f903]

# Python backtrace
  File "<string>", line 264 in fluid_file_import_s1
  File "<string>", line 72 in liquid_load_data_1
  File "<string>", line 1 in <module>

going in and out of editmode in a 2.93 Release build or 2.92 beta also crashes. (this might be related to #84649 (Quick liquid causing crash on scale operation) though)

Will confirm for now.

Also not sure I understand collisions correctly in mantaflow: @sebbas: does the effector need to cover a whole cell? reason I am asking is: - you can also get it to work if you increase the solidify thickness considerably - you can also get it to work if you increase the domain resolution division considerably @sebbas: also note that I get two crashes: - opening liquid collision.blend in a Debug build ``` # Blender 2.93.0, Commit date: 2021-01-31 14:53, Hash b10fac0432c6 # backtrace ./bin/blender(BLI_system_backtrace+0x26) [0xe1066d2] ./bin/blender() [0x3406a50] ./bin/blender() [0x3406c50] /lib64/libc.so.6(+0x3da60) [0x7f0d20c7ba60] ./bin/blender(_ZN5Manta5ErrorC2ERKSs+0x82) [0xc6e7f4c] ./bin/blender(_ZNK5Manta8GridBase10checkIndexEiii+0x21f) [0xc701087] ./bin/blender(_ZNK5Manta8GridBase5indexEiii+0x2a) [0xc700d5e] ./bin/blender(_ZN5Manta4GridINS_8Vector3DIfEEE3setEiiiRS2_+0x3a) [0xc7af456] ./bin/blender() [0xcabc30e] ./bin/blender(_ZN5Manta14readObjectsVDBERKSsPSt6vectorIPNS_7PbClassESaIS4_EEf+0xd76) [0xcab9c45] ./bin/blender(_ZN5Manta4loadERKSsRSt6vectorIPNS_7PbClassESaIS4_EEf+0x27f) [0xc775768] ./bin/blender() [0xc775cb6] ./bin/blender(_PyMethodDef_RawFastCallKeywords+0x193) [0xcc5d343] ./bin/blender(_PyCFunction_FastCallKeywords+0x28) [0xcc5d538] ./bin/blender() [0x33f9a70] ./bin/blender(_PyEval_EvalFrameDefault+0x4b54) [0x33fe714] ./bin/blender(_PyEval_EvalCodeWithName+0x92d) [0xccfe3dd] ./bin/blender(_PyFunction_FastCallKeywords+0x89) [0xcc5cf79] ./bin/blender() [0x33f9835] ./bin/blender(_PyEval_EvalFrameDefault+0x4b54) [0x33fe714] ./bin/blender() [0x33f859b] ./bin/blender() [0x33f9835] ./bin/blender(_PyEval_EvalFrameDefault+0x4344) [0x33fdf04] ./bin/blender(_PyEval_EvalCodeWithName+0x92d) [0xccfe3dd] ./bin/blender(PyEval_EvalCodeEx+0x3e) [0xccfe65e] ./bin/blender(PyEval_EvalCode+0x1b) [0xccfe68b] ./bin/blender(PyRun_StringFlags+0x8f) [0xcd2f67f] ./bin/blender(_ZN5MANTA15runPythonStringESt6vectorISsSaISsEE+0xd5) [0xc6c5b89] ./bin/blender(_ZN5MANTA8readDataEP17FluidModifierDataib+0x590) [0xc6d52ec] ./bin/blender(manta_read_data+0x2f) [0xc6becfd] ./bin/blender() [0x393c172] ./bin/blender() [0x393c65d] ./bin/blender(BKE_fluid_modifier_do+0x93) [0x393c6f3] ./bin/blender() [0x3f7ab57] ./bin/blender(BKE_modifier_modify_mesh+0xe9) [0x34c4666] ./bin/blender() [0x3890ca8] ./bin/blender() [0x3891ad1] ./bin/blender() [0x3893ca6] ./bin/blender(makeDerivedMesh+0xaa) [0x3894238] ./bin/blender(BKE_object_handle_data_update+0x199) [0x3506c76] ./bin/blender(BKE_object_eval_uber_data+0x8a) [0x35075b4] ./bin/blender(_ZSt13__invoke_implIvRPFvP9DepsgraphP5SceneP6ObjectEJS1_RS3_RS5_EET_St14__invoke_otherOT0_DpOT1_+0x65) [0xcc213dd] ./bin/blender(_ZSt8__invokeIRPFvP9DepsgraphP5SceneP6ObjectEJS1_RS3_RS5_EENSt15__invoke_resultIT_JDpT0_EE4typeEOSC_DpOSD_+0x67) [0xcc1fa5a] ./bin/blender(_ZNSt5_BindIFPFvP9DepsgraphP5SceneP6ObjectESt12_PlaceholderILi1EES3_S5_EE6__callIvJOS1_EJLm0ELm1ELm2EEEET_OSt5tupleIJDpT0_EESt12_Index_tupleIJXspT1_EEE+0xa0) [0xcc1dd7e] ./bin/blender(_ZNSt5_BindIFPFvP9DepsgraphP5SceneP6ObjectESt12_PlaceholderILi1EES3_S5_EEclIJS1_EvEET0_DpOT_+0x41) [0xcc1bcb7] ./bin/blender(_ZSt13__invoke_implIvRSt5_BindIFPFvP9DepsgraphP5SceneP6ObjectESt12_PlaceholderILi1EES4_S6_EEJS2_EET_St14__invoke_otherOT0_DpOT1_+0x37) [0xcc18fd9] ./bin/blender(_ZSt10__invoke_rIvRSt5_BindIFPFvP9DepsgraphP5SceneP6ObjectESt12_PlaceholderILi1EES4_S6_EEJS2_EENSt9enable_ifIX16is_invocable_r_vIT_T0_DpT1_EESF_E4typeEOSG_DpOSH_+0x37) [0xcc1583d] ./bin/blender(_ZNSt17_Function_handlerIFvP9DepsgraphESt5_BindIFPFvS1_P5SceneP6ObjectESt12_PlaceholderILi1EES5_S7_EEE9_M_invokeERKSt9_Any_dataOS1_+0x37) [0xcc128db] ./bin/blender(_ZNKSt8functionIFvP9DepsgraphEEclES1_+0x49) [0xcbee387] ./bin/blender() [0xcbed633] ./bin/blender() [0xcbed679] ./bin/blender(_ZZNK4TaskclEvENKUlvE_clEv+0x34) [0xe10cdbe] ./bin/blender() [0xe10d182] ./bin/blender() [0x398bbe5] ./bin/blender() [0xe10cf6a] ./bin/blender() [0xe10ce93] ./bin/blender(_ZNK4TaskclEv+0x20) [0xe10cde2] ./bin/blender() [0xe10d15e] ./bin/blender() [0x39992e5] ./bin/blender() [0x399959b] ./bin/blender() [0x398b8f7] ./bin/blender() [0x3993060] ./bin/blender() [0x399506c] ./bin/blender() [0x3995269] /lib64/libpthread.so.0(+0x93f9) [0x7f0d213c73f9] /lib64/libc.so.6(clone+0x43) [0x7f0d20d3f903] # Python backtrace File "<string>", line 264 in fluid_file_import_s1 File "<string>", line 72 in liquid_load_data_1 File "<string>", line 1 in <module> ``` - going in and out of editmode in a 2.93 Release build or 2.92 beta also crashes. (this might be related to #84649 (Quick liquid causing crash on scale operation) though) Will confirm for now.

Philipp Oeser changed title from ~~Mantaflow liquid collisions not working properly~~ to Mantaflow liquid collisions not working properly (also crashes going in and out of editmode on the domain)

2021-02-01 12:10:15 +01:00

Greg Neumiller commented

2021-02-01 19:55:55 +01:00

Added subscriber: @rlneumiller

Greg Neumiller commented

2021-02-01 19:55:55 +01:00

version: 2.93.0 Alpha, branch: master, commit date: 2021-01-31 14:53, hash: b10fac0432, type:
build date: 2021-02-01, 18:17:25
I'm not seeing the crash on Windows 10 1909 GeForce GTX 1660 Ti 461.09.

version: 2.93.0 Alpha, branch: master, commit date: 2021-01-31 14:53, hash: b10fac0432c6, type: build date: 2021-02-01, 18:17:25 I'm not seeing the crash on Windows 10 1909 GeForce GTX 1660 Ti 461.09.

Greg Neumiller commented

2021-02-01 19:59:38 +01:00

I also don't see the repro (nothing happens when I "play" the simulation in either "liquid collision.blend" or "muzzle*.blend".
Perhaps more detail as to how to reproduce the issue is needed.

I also don't see the repro (nothing happens when I "play" the simulation in either "liquid collision.blend" or "muzzle*.blend". Perhaps more detail as to how to reproduce the issue is needed.

Sebastián Barschkis self-assigned this 2021-02-16 17:07:41 +01:00

Sebastián Barschkis commented

2021-02-16 17:07:41 +01:00

Looked a bit into this issue. The crash seems to be resolved and so I'm adjusting the priority.

Raimund Klink commented

2021-02-16 17:11:04 +01:00

Added subscriber: @Raimund58

James Tomkinson commented

2021-04-27 23:25:43 +02:00

Changed status from 'Confirmed' to: 'Needs Developer To Reproduce'

James Tomkinson commented

2021-04-27 23:25:43 +02:00

After a whole afternoon of "playing around" with liquid collision objects and domain parameters, I'm thinking this is more of a documentation issue plus a lack of nuanced tutorials. I would be willing to take a stab at the user manual, which is never complete enough and I realize is only meant to "list" and put a simple description of parameters, rather than be some complete encyclopedia of workflow or usage. I used varieties of fluid collision objects like:

A collision cube with a minimum height where fluid would not pass through (at some Res Division)

A collision plane with a minimum surface thickness where fluid would not pass through (at some Res Division)

A collision plane with a minimum solidify thickness where fluid would not pass through (at some Res Division)

A domain with a larger Resolution Division that allowed for thinner collision objects
A domain with smaller Res Division but smaller particle radius where fluid would not pass through collision obj of thinner dimension

I think there should be some form of documentation that mentions these inter-dependencies. There certainly is some mention of Resolution Division. But the rest is Stack Exchange hunting and hit/miss that costs great amount of iterative bake time. I have perhaps also passed incomplete information on Stack Exchange on this issue.

Is there some way to convert this to a documentation ToDo?

fluid 2 92.blend

After a whole afternoon of "playing around" with liquid collision objects and domain parameters, I'm thinking this is more of a documentation issue plus a lack of nuanced tutorials. I would be willing to take a stab at the user manual, which is never complete enough and I realize is only meant to "list" and put a simple description of parameters, rather than be some complete encyclopedia of workflow or usage. I used varieties of fluid collision objects like: - A collision cube with a minimum height where fluid would not pass through (at some Res Division) # A collision plane with a minimum surface thickness where fluid would not pass through (at some Res Division) # A collision plane with a minimum solidify thickness where fluid would not pass through (at some Res Division) - A domain with a larger Resolution Division that allowed for thinner collision objects - A domain with smaller Res Division but smaller particle radius where fluid would not pass through collision obj of thinner dimension I think there should be some form of documentation that mentions these inter-dependencies. There certainly is some mention of Resolution Division. But the rest is Stack Exchange hunting and hit/miss that costs great amount of iterative bake time. I have perhaps also passed incomplete information on Stack Exchange on this issue. Is there some way to convert this to a documentation ToDo? [fluid 2 92.blend](https://archive.blender.org/developer/F10042460/fluid_2_92.blend)

James Tomkinson changed title from ~~Mantaflow liquid collisions not working properly (also crashes going in and out of editmode on the domain)~~ to Mantaflow liquid collisions not working properly

2021-04-27 23:26:06 +02:00

Philipp Oeser removed the

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Mantaflow liquid collisions not working properly #85214

A collision plane with a minimum surface thickness where fluid would not pass through (at some Res Division)

A collision plane with a minimum solidify thickness where fluid would not pass through (at some Res Division)