Cloth simulation collision differs between viewport and render when collider is hidden #110983

New Issue

Max Mustermann · 2023-08-09T21:24:51+02:00

Max Mustermann commented

2023-08-09 21:24:51 +02:00

System Information
Operating system: Fedora Linux
Graphics card: AMD

Blender Version
Broken: 3.3.0 - 3.6.1
Worked:

Short description of error
Cloth simulation collision differs between viewport and render when collider is hidden in both.

Exact steps for others to reproduce the error
Based on the default startup or an attached .blend file (as simple as possible).

create a cloth that will collide with the default cube
hide the default cube in both render and viewport
press play
the cloth will collide with the hidden default cube
press pause
go to frame 1
enter and exit edit mode on the cloth mesh to reset the cloth simulation cache
render the animation
the cloth will not collide with the hidden default cube

Additionally:

If you play with cube hidden, up to when cloth collided the cube, and render animation, the animation will be like: cloth collided the cube, and after the cache runs out, it starts falling as if the cube has not been there.

**System Information** Operating system: Fedora Linux Graphics card: AMD **Blender Version** Broken: 3.3.0 - 3.6.1 Worked: **Short description of error** Cloth simulation collision differs between viewport and render when collider is hidden in both. **Exact steps for others to reproduce the error** Based on the default startup or an attached .blend file (as simple as possible). - create a cloth that will collide with the default cube - hide the default cube in both render and viewport - press play - the cloth will collide with the hidden default cube - press pause - go to frame 1 - enter and exit edit mode on the cloth mesh to reset the cloth simulation cache - render the animation - the cloth will not collide with the hidden default cube Additionally: - If you play with cube hidden, up to when cloth collided the cube, and render animation, the animation will be like: cloth collided the cube, and after the cache runs out, it starts falling as if the cube has not been there.

clothsim.mkv

3.4 MiB

Max Mustermann added the

labels 2023-08-09 21:24:52 +02:00

Max Mustermann changed title from ~~Regression: Cloth simulation collision differs between viewport and render when collider is hidden~~ to Cloth simulation collision differs between viewport and render when collider is hidden

2023-08-09 21:42:25 +02:00

YimingWu commented

2023-08-10 05:42:44 +02:00

Can confirm.

From the look of it, if the cache is being calculated during render, it will respect the render visibility setting rather than the collision visibility setting (which is configurable on the side of collision button, different than the eye and camera icon in the outline)

I think the simulation should behave as if it always take object.collision.use property, regardless of viewport or render visibility. So currently viewport simulation run is correct, but during render it's wrong.

Can confirm. From the look of it, if the cache is being calculated during render, it will respect the render visibility setting rather than the collision visibility setting (which is configurable on the side of collision button, different than the eye and camera icon in the outline) I think the simulation should behave as if it always take `object.collision.use` property, regardless of viewport or render visibility. So currently viewport simulation run is correct, but during render it's wrong.

YimingWu added

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Cloth simulation collision differs between viewport and render when collider is hidden #110983