Orbit Trap
From Ultrafractal Wiki
Orbit Trapping is a mathematical method for mapping an arbitrary shape (a Trap) to a fractal. It is used in many Coloring Algorithms.
Excellent illustrated explanation: [3]
JAME is an Open Source fractal program which can be useful to visual Orbit Traps.
see: [4]
some Orbit Trap Coloring Algorithms:
Orbit Traps Direct (UF5) Orbit Traps Gradient (UF5)
Using Orbit Traps to illuminate spots on a layer:
SpotLighting
