The central origin metric.
Initial radius at start_angle.
Entering polar angle.
The total sweep angle radially.
Polygon resolution.
The total linear delta applied to radius over the sweep length.
The total vertical delta applied to Z over the sweep length.
Array of Points defining a fully transitional 3D arc.
Generates a complex arc whose radius and Z height vary steadily over the sweep.
Useful for drawing transition shapes like the sloped ramps in a spiral vase mode.