Pin to Target

https://gyazo.com/45122e88ad916c92bedd8f27b3cf187c

Pins the specified points to the corresponding point in the target geometry. The target geometry for a Vellum solver is usually the first input, so it matches the animation, but can be overridden.

Vellum Constraints SOP.iconVellum Constraints SOP で作成できる拘束の一つ

Pin to Animation

Pin to Animation - Vellum Constraints

Match Animation

https://gyazo.com/046af35c4c9538ce70cb95fc3fb6e4bd

有効にした場合 Geometry に point attribute i@gluetoanimation = 1 がセットされる

PinType: Permanent

https://gyazo.com/6fc3923038a1b4cd4c8c9b679b280e31

The mass attribute is set to zero, making the point a hard constraint. However, as no original value of mass is stored, it isn’t possible to release this constraint later.

Geometry の f@mass point attribute を 0 とする修正を行う

Constraint Geometry には何も加えない

PinType: Stopped

https://gyazo.com/ae92e238c5a0e4d5efdd86d6e6a3f0fa

The stopped attribute is set to 1 to make the point a hard constraint. mass is unaffected so a POP operation can restore the dynamics of the point later by resetting stopped to 0.

Geometry の i@stopped point attribute を 1 とする修正を行う

Permanent と同様の効果が生まれるがこちらは後から i@stopped = 0 として Pin 拘束を解除という操作に対応している

Constraint Geometry には何も変更を行わない

Pin Type: Soft

上記2つとは異なり長さ(f@restlength) が 0 の distance 拘束を作成する

s@type は pin (位置拘束) と pinorient (回転拘束)