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Description

I experimented (as I had announced before) a bit with cloth physics, this time on how pinning works.

Pinning allows chosen vertices to stay in place instead of being deformed from some kind of influence.

Here's a short video on how to pin cloth by user Andrea Cantelli: Tips & Tricks for Blender 2.9 | Pin a model to use in a Cloth Simulation

Pinned vertices can either not be moved at all or show some resistance when moved, based on some properties. Both cases are shown in the GIF above. Only the border vertices got pinned, in one scenario they have a vertex weight of 1 and in the other a vertex weight of 0.5

The Stiffness value (found below the Pin Group) was 0.7 in both cases.

Vertex weight and Stiffness are the only two properties that I found that influence pinning strength.

But, an important observation was made:

Stiffness is only taken into account for a certain vertex if the vertex weight in the Pin Group is NOT 1.0

If the weight of a vertex is exactly 1.0 it will always stay at the same position, no matter how big of a force is applied. You can use a stiffness of 0 and it still holds true. But if the vertex has any weight lower than 1.0 than the stiffness value will be used as well (even on a weight like 0.999).

For demonstration:

Weight = 1.0   Stiffness = 0.5

Weight = 1.0   Stiffness = 25.0

both stay completely in place, but

Weight = 0.5   Stiffness = 0.5

Weight = 0.5   Stiffness = 25.0

can both me moved by certain forces (such as gravity), but at different strengths.

In other words: If you only want to pin vertices into exactly one place, give them a weight of 1.0 in the Pin Group and ignore the Stiffness value.

Description

I experimented (as I had announced before) a bit with cloth physics, this time on how pinning works.

Pinning allows chosen vertices to stay in place instead of being deformed from some kind of influence.

Here's a short video on how to pin cloth by user Andrea Cantelli: Tips & Tricks for Blender 2.9 | Pin a model to use in a Cloth Simulation

Pinned vertices can either not be moved at all or show some resistance when moved, based on some properties. Both cases are shown in the GIF above. Only the border vertices got pinned, in one scenario they have a vertex weight of 1 and in the other a vertex weight of 0.5

The Stiffness value (found below the Pin Group) was 0.7 in both cases.

Vertex weight and Stiffness are the only two properties that I found that influence pinning strength.

But, an important observation was made:

Stiffness is only taken into account for a certain vertex if the vertex weight in the Pin Group is NOT 1.0

If the weight of a vertex is exactly 1.0 it will always stay at the same position, no matter how big of a force is applied. You can use a stiffness of 0 and it still holds true. But if the vertex has any weight lower than 1.0 than the stiffness value will be used as well (even on a weight like 0.999).

For demonstration:

Weight = 1.0   Stiffness = 0.5

Weight = 1.0   Stiffness = 25.0

both stay completely in place, but

Weight = 0.5   Stiffness = 0.5

Weight = 0.5   Stiffness = 25.0

can both me moved by certain forces (such as gravity), but at different strengths.

In other words: If you only want to pin vertices into exactly one place, give them a weight of 1.0 in the Pin Group and ignore the Stiffness value.