Optional callback returning the cloud settings to modulate the shaft
density against. Provide this when a CloudFeature is also in
the pipeline so the rays dim beneath each cloud; omit for a constant
full-strength shaft set.
OptionalmaxSteps
maxSteps?:number
Initial maxSteps; clamp to a smaller value for performance.
Optional callback returning the cloud settings to modulate the shaft density against. Provide this when a CloudFeature is also in the pipeline so the rays dim beneath each cloud; omit for a constant full-strength shaft set.