Hi,

Are there any examples of how cloth tearing and fracturing work in Houdini 16? When clicking on “Enable Tearing” on the cloth solver and “Enable Fracturing” on the cloth object, my cloth with teach all of its polygons individually apart.

From what I understand, I should be able to affect this by adding a fractureapart attribute however this doesn't seem to affect anything.

Also, the docs don't actually make any reference to the Fracturing tab on the Cloth Object.

Does anyone have any ideas?

I've attached a simple example file of where I was able to get to.

Thanks

An important fracturing bug was fixed in 16.0.562, so be sure to get this version of Houdini 16, or newer.

For the rest, it's just a matter of playing with the Fracture Threshold parameter on the Cloth Object to get the desired behavior. I'd go up to, say 10000 in this example.

About the fracturepart attribute, make sure it's called “fracturepart” and make it a primitive attribute.
Alternatively, you can simply make use of the Solid Fracture tool, which was designed to work for the Solid Object but also happens to work for the Cloth Object.

I'm attaching a version of your file in which I made these changes.

Thanks for the quick reply and the sample file.

I'd like to confirm one other thing though. The solid fracture tool does not work on a grid, is that correct?

where to download 16.0.562 , its 16.0.557 in sideFx.

First ensure that you're logged into this website. Then from the download page, scroll to the bottom and click on “Daily Builds”. Download the latest 16.0.XYZ build.

Not to hijack this thread but I took the provided scene file to try and learn more about creating tearing cloth. I added a group of points down the center of the grid and wondered if there's a way to tell it to tear the cloth on the points in the group? Thanks.

gswartz, I think the way to do this is to set fracturepart attribute for the prims on either side of the line you've created in points. Looking at the Solid Fracture attributes it is working with prims not points.

I've attached a hip that explicitly sets fracturepart for a group of primitives but I can't work out how to set the tear threshold or interoperate with solid fracture. I think the idea is that you can modify the solid fracture DA yourself but I haven't delved that far yet.

All, is there a tear threshold attribute you can set per prim?

The cloth solver recognizes a point attribute called “fracturethreshold”. This works as a multiplier for the Fracture Threshold parameter on the Cloth Object.

thanks!!!!