Interface DrawingLine

Line classification

VIEW DEPTH at the line's start point (issue #2639, see the convention comment in projection-bands.ts): the negated flip-adjusted signed depth, so 0 at the cut plane, increasing into the kept half, smaller means nearer the viewer. Hidden-line removal compares this against the occluder depth buffer, which stores the same quantity.

View depth at the line's END point, when it differs from depth (e.g. a sloped edge). The hidden-line classifier lerps depth..depthEnd along the 2D line per sample; omitted means constant depth.

Source IFC entity expressId

IFC type name (e.g., "IfcWall")

2D line geometry

Model index for multi-model federation

Visibility after hidden line removal