Editor-only class for defining a collision polygon in 3D space. Allows editing a collision polygon's vertices on a selected plane. Can also set a depth perpendicular to that plane. This class is only available in the editor. It will not appear in the scene tree at runtime. Creates a [Shape] for gameplay. Properties modified during gameplay will have no effect. Length that the resulting collision extends in either direction perpendicular to its polygon. If true, no collision will be produced. Array of vertices which define the polygon.