Random Color Utility Shader
Selects one of the colour with some probability. Each importance input gives a certain probability of being selected to the corresponding color.
→ Color 1
→ Importance 1
Color and importance of the first choice.
→ Color 2
→ Importance 2
Color and importance of the second choice.
→ Color 3
→ Importance 3
Color and importnace of the third chouce.
→ Color 4
→ Importance 4
Color and importance of the fourth choice.