From Mod Wiki
integer handle -- Handle to the decal vector origin -- Start position of the projection. vector direction -- Direction in which to project. float depth -- Distance to project. boolean parallel -- Whether the projection should be parallel or not. vector size -- Size of the projected rectangle. float angle -- Angle to rotate the rectangle by. vector color -- Color to apply to the vertices.
- The z component of size is unused.
Performs a projection and adds the geometry found to this decal.