Collision box ends up square instead of contoured.

[davids56375427]

I'm trying to make a particle system of hail bouncing off an umbrella.

I have the collision tag on the umbrella. And a Particle behavior with collision turned on on the hail ball

When I run the scene, the hail falls and things collide but the umbrella has a rectangular collision box.

The collision settings on the Physics behavior are set to "contour" for shape, but the collision box isn't countoured.

If I make the umbrell not independent I can see the countoured mesh, but then the collision doesn't work.

I could sware I was able to get this working previously but I don't know how. Is there a way to make a contoured collision box work?

[KJerryK]

The only way I've tried it so far is to have the snow and object in separate files. Here's what that looks like.

[davids56375427]

Thanks. I tried it with the hail in a sepparate puppet but the problem is the same. Could this have something to do with the last update Oct 2019?

I looked at the physics playground example puppet here:Character Animator Examples and it seems like all the balls in that scene have square collision boxes.

[KJerryK]

The example I posted is done in the latest update, using puppet files from earlier CH releases. The umbrella seems to be causing the problem. If you post a link to your project I could take a closer look.

[davids56375427]

That would be amazing! Here's the project Dropbox - Umbrella Test.zip

[KJerryK]

Okay, got it. I've something I have to do right now, but will get to it in a couple hours. In the meantime, I did a test with both in the same puppet and I see the same thing you're seeing. So right now it's a mystery.

[KJerryK · Accepted solution]

Oh, I took a quick look, and made this one change in the rigging, and this is what I get

[davids56375427]

Awesome. So the key was to make the main group independent. Thank you so much!

[KJerryK]

Since posting above I have done some more testing, and found that changing the independence doesn't always work. Another way I found to get the particles to follow the umbrella contour is, after everything else is set up, to just move a handle on the umbrella in the rig panel. It doesn't seem to matter where the handle is moved. I have no idea why this makes a difference, but it seems to fix it.

[alank99101739]

Just move an existing handle? That sounds like it is triggering a cache flush or similar. if repeatable sounds like s bug report candidate.