meshing.detect_branch_changes

meshing.detect_branch_changes(branches, incidence)

Mark cells whose incident Hermite samples disagree on the active branch.

A hard CSG crease lies exactly where the surface switches from one min/max operand to another, so a cell whose surface samples carry different active branches straddles a seam. This is exact for hard Booleans and needs no angular threshold; combine it with :func:classify_feature_cells for black-box or smoothly blended fields.

Parameters

Name	Type	Description	Default
branches	np.ndarray	Active branch per Hermite sample, from :func:active_branches, shaped (edge_count,).	required
incidence	CellIncidence	Cell-to-edge mapping for the same edge set.	required

Returns

Name	Type	Description
	np.ndarray	Boolean mask shaped (cell_count,); True where a seam crosses
	np.ndarray	the cell.