Test whether a sphere centered at `center` with radius-squared `radius_sq` collides with any point in this tree. Returns `true` if in collision and `f

Return transformation matrix from sequence of transformations. This is the inverse of the decompose_matrix function. Sequence of transformat

Return sequence of transformations from transformation matrix. matrix : array_like Non-degenerative homogeneous transformation matrix

Set initial cursor window coordinates and pick constrain-axis.

Update current cursor window coordinates.

Get r-disc neighbours, then iterate through list until a valid connection is found Necessary workaround given asymmetric cost function ---------------