fn frame(
position: [f64; 3],
transform: Transform,
) -> ([[f64; 3]; 3], [[[f64; 3]; 3]; 2])Expand description
Rotation of vector components into the output frame of transform, and its
derivatives with respect to the (at most two) angles it depends on. Inverse
transforms use the transposed matrices. Polar vectors use the first two
rows/columns; no radial metric factors occur.