Why does this dress expand like a hot air balloon?

Support Particles and Physics Simulations
1

I have two Blender files: cloth_settles.blend and cloth_doesnt_settle.blend.

Both files use the same rigged model. Both files use the same parameters for their dress simulation as well as their collision object parameters.

Both files contain similar (but not exact) dresses, initially created with the Simply Cloth Pro add-on.

However, their behavior – when applying a cloth simulation – could not be any more different. This video demonstrates the problem:

I cannot figure out why the one dress sits normally while the other one expands like a hot air balloon.

Here are the files:

cloth_settles.blend

cloth_doesnt_settle.blend

It seems that I got lucky only once with the cloth properly settling. All of the other times I tried (and I’ve tried a lot, always starting with the same previously-created base file), I get the hot air balloon effect.

Does anyone have any idea what’s going on? I’ve been hammering away at this for a week but with no progress :confused:

2

It’s the object collision distance setting in the dress. In “cloth_doesn’t_settle” the distance is set to a much higher value than in the other file:

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edit: and you may also want to reduce the collision thickness on the body:

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1 Like
3

THANK YOU @LordoftheFleas ! I can’t tell you how many hours I spent trying to figure this out.

I figured out why this happened. The Simply Cloth Pro add-on (a great add-on overall) appears to have only one way binding for some (maybe all?) of its parameters it shares with Blender. So when I select the dress and go to Simply Cloth Pro → Cloth Parameter → Object Collision Distance and change that parameter, it changes the parameter in Blender when I go to the Physics Property tab → Cloth → Object Collisions → Distance.

However, when I go to the Physics Property tab → Cloth → Object Collisions → Distance and change that parameter, the equivalent parameter in Simply Cloth Pro does not change…misleading me and making me think that my object collision distance is something that it’s not.

4

Glad it helped! Good thing that I don’t know about the add-on :slight_smile: I just disabled collision to check what was going on and saw the dress falling through the body without getting blown up. So it had to be one of the collision settings.