FixOrientation

Source: models/solid_mechanics/crystal_plasticity/FixOrientation.py

Swap the modified-Rodrigues representation to the shadow parameter set when \(\left\lVert r \right\rVert^2 \geq t\) (default threshold \(t = 1\)), avoiding the \(2\pi\) singularity. The shadow map is \(r^* = -r / \left\lVert r \right\rVert^2\).

See Banks, Matthew Jarrett, “Switching Methods for Three-Dimensional Rotational Dynamics Using Modified Rodrigues Parameters.” (2023).

Inputs

input — input · Rot · required

Name of input tensor of orientations to operate on.

Outputs

output — output · Rot · required

Name of output tensor

Other options

threshold — float · default 1.0

Threshold value for translating to the shadow parameters