Used to establish a reference frame for StrandOrientation if StrandDeform is true. The vector is expressed relative to the point cloud's local space.

The strand tangent defines the Y axis and this attribute represents the X axis in the point cloud's local coordinates.

If this attribute is not defined, the up-vector is calculated from the camera, which will make the deformations rotate if the camera moves.

If the size of this array does not match StrandPosition, it is ignored.

Data Type

array of 3D vectors

Belongs To


Geometry Types

  • point cloud

Attribute Type


R/W or RO: