high resolution smoke doesn't collide properly with animated objects #39261

New Issue

Kristian Halvorsen · 2014-03-19T12:51:16+01:00

2014-03-19 12:51:16 +01:00

System Information
Windows 7 Professional 64 bit, NVidia Geforce GT 650M
also reproduced on
Windows 7 Professional 64 bit, NVidia Quaddro 2000

Blender Version
Broken: 2.69.0 r60995, also 2.70 release candidate Date: 12-03-2014 Hash: 2525f9c
working: None that I've tried

Short description of error
The generated smoke from the smoke high resolution settings doesn't seem to calculate animated collisions properly and thus spreads through
animated smoke collision objects.

Exact steps for others to reproduce the error
high_res_smoke_animated_collision.blend
Smoke flow & domain is set up with animated collision object,
so just play the animation.

**System Information** Windows 7 Professional 64 bit, NVidia Geforce GT 650M also reproduced on Windows 7 Professional 64 bit, NVidia Quaddro 2000 **Blender Version** Broken: 2.69.0 r60995, also 2.70 release candidate Date: 12-03-2014 Hash: 2525f9c working: None that I've tried **Short description of error** The generated smoke from the smoke high resolution settings doesn't seem to calculate animated collisions properly and thus spreads through animated smoke collision objects. **Exact steps for others to reproduce the error** [high_res_smoke_animated_collision.blend](https://archive.blender.org/developer/F81774/high_res_smoke_animated_collision.blend) Smoke flow & domain is set up with animated collision object, so just play the animation.

Kristian Halvorsen commented

2014-03-19 12:51:16 +01:00

Changed status to: 'Open'

Kristian Halvorsen commented

2014-03-19 12:51:16 +01:00

Added subscriber: @krisoyo

Lukas Tönne commented

2014-03-19 15:54:34 +01:00

Changed status from 'Open' to: 'Archived'

Lukas Tönne closed this issue

2014-03-19 15:54:34 +01:00

Lukas Tönne self-assigned this 2014-03-19 15:54:34 +01:00

Lukas Tönne commented

2014-03-19 15:54:34 +01:00

This is not a bug. The whole point of the "HighRes" feature in smoke sim is to provide additional detail at little to no cost. This means it cannot take into account things like collision or forcefields, otherwise it would work just like regular smoke and not be a separate feature.

To use this properly your colliders have to have some thickness to them. A "zero thickness" plane like in the test file is not suitable as a smoke collider really.

This is not a bug. The whole point of the "HighRes" feature in smoke sim is to provide additional detail *at little to no cost*. This means it cannot take into account things like collision or forcefields, otherwise it would work just like regular smoke and not be a separate feature. To use this properly your colliders have to have some thickness to them. A "zero thickness" plane like in the test file is not suitable as a smoke collider really.

Lukas Tönne commented

2014-03-19 16:34:55 +01:00

Changed status from 'Archived' to: 'Open'

Lukas Tönne reopened this issue

2014-03-19 16:34:55 +01:00

Lukas Tönne commented

2014-03-19 16:34:55 +01:00

Added subscriber: @miikah

Lukas Tönne commented

2014-03-19 16:34:55 +01:00

Discussed this with @miikah, looks like this could actually be considered a bug. Unfortunately there is no good solution to the problem either way ...

Collision with animated objects clears cells marked as "obstacles" entirely, which leads to blocky appearance (just see what happens when you disable highres smoke in the example). Doing the same for highres smoke might be less obvious, but could still show undesirable artifacts (gap between collider and smoke).

Added this to the ToDo list: http://wiki.blender.org/index.php/Dev:2.5/Source/Development/Todo/Tools#Smoke

Discussed this with @miikah, looks like this could actually be considered a bug. Unfortunately there is no good solution to the problem either way ... Collision with animated objects clears cells marked as "obstacles" entirely, which leads to blocky appearance (just see what happens when you disable highres smoke in the example). Doing the same for highres smoke might be less obvious, but could still show undesirable artifacts (gap between collider and smoke). Added this to the ToDo list: http://wiki.blender.org/index.php/Dev:2.5/Source/Development/Todo/Tools#Smoke

Lukas Tönne removed their assignment 2014-03-19 16:35:12 +01:00

Daniel Genrich was assigned by Lukas Tönne

2014-03-19 16:35:12 +01:00

Lukas Tönne commented

2014-03-19 16:35:12 +01:00

Added subscriber: @LukasTonne

Lukas Tönne commented

2014-03-19 16:35:33 +01:00

Changed status from 'Open' to: 'Archived'

Lukas Tönne closed this issue

2014-03-19 16:35:33 +01:00

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high resolution smoke doesn't collide properly with animated objects #39261