My cloth simulation is shrink wrapping the shirt around the arms and body. It's weird. Seems like gravity should be doing more. I've checked my geo size .7 meters for the shirt and gravity is on.

Should I be doing something else with the rest state?

Any tips on how to understand stiffness terms: Edge Stretch, Shear, Weak Bend. In layman's terms. I've read the help documentation and it's confusing. What do I turn down or up if I want the fabric to flow more?

Thanks Stacy

DOPs is generally MKS (MetersKilogramsSeconds). Your shirt size is reasonably sized in Meters.

The Spatial Scale has by far the largest effect on any cloth simulation. In your scene it defaults to 0.01. Adjusting your spatial scale to 1 will now simulate your cloth at the industry accepted MKS units as intended.

After this it's about changing the Material Properties: stretch, shear and bend stiffness. Tweaking these settings for your shirt will take a bit of time but it's worth it.

It looks like the shape of your shirt at the scale it was being simulated at (barbie proportions at 0.01) was stiffer and light and as the shirt deformed downward in the arm pit region it caused the entire area under the arm to pinch in forcing the bottom sleeve in to the arm. Think of a stiff rubber bending that has very little shear stretching.

Critically, your shirt as modelled in reality, as a real cotton shirt, would not sell at all as it would look extremely baggy under the arms. That is unless you are a Pirate and like puffy shirts in the underarm region.

Have a look at how real shirts are tailored around the sleeve and adjust your shirt geometry accordingly. Get that underarm region looking like a real shirt and it will do wonders to the way the sleeve lays on the arm.

Thanks Jeff spatial scale of 1 makes a big difference.

Would still love some tips on what the terms (Edge Stretch, Shear, Weak Bend) mean in laymen's terms. I'm playing with them I just don't quite get what they are each responsible for.

cheers, Stacy

fish.stacy
Thanks Jeff spatial scale of 1 makes a big difference.

Would still love some tips on what the terms (Edge Stretch, Shear, Weak Bend) mean in laymen's terms. I'm playing with them I just don't quite get what they are each responsible for.

cheers, Stacy

Hi,

Here's how I like to think of it: the cloth solver looks at three types of deformation
Stretch - deformations along the edges of the poly
Shear - deformations perpendicular to the edge of the poly, but parallel to the plane of the poly
Bend - deformations perpendicular to the plane of the polygon

The solver then creates internal forces to counteract the deformations. The big difference between the weak and strong bend models is that the second one tries to restore the original shape (rest) of the cloth while the first tends to settle in the deformed position with time.
For a visual guideline of the effect of increasing those parameters I like this page:
http://www.sidefx.com/docs/houdini12.1/cloth/changing_cloth_look [sidefx.com]
The animated gif with the dresses…

Hope this helps

Super helpful. thanks.