fastshadow vex function

Contexts: displace , fog , light , shadow , surface

Tags: shading

Sends a ray from the position P along the direction specified by the direction D.

1. float fastshadow(vector P, vector D, float bias)

Sends a ray from the position P along the direction specified by the direction D. The length of the D vector represents the farthest distance considered when check for occlusion.

Returns 1 if there are no occluding objects found, or 0 if the ray hit an object in between.

See optional parameters .