Raycast Projection for Distance Map (Splines)

When using a spline as the source in the Corona Distance Map, the effect only appears where the spline physically intersects the surface or falls within the distance threshold.

Request:
Add a Raycast Projection mode so that the entire spline is projected onto the target surface (similar to a decal), regardless of physical intersection.

For closed splines, the projected region should be treated as filled so that “Color Inside” works as an actual fill for the enclosed area.

Why:
This would allow splines to be used as lightweight masks for materials, displacement, scattering, and terrain effects, without needing to convert them into extruded geometry.