Vincent Nacon
Randomize the color values to introduce noise differentiation, which help break up the same particles from looking too similar as they come into view.
If PSYS_PART_INTERP_COLOR_MASK provided, can have different END state.
Ex:
[PSYS_PART_FLAGS, PSYS_PART_INTERP_COLOR_MASK, PSYS_PART_START_COLOR_NOISE, <1.0, 0.0, 0.5>, PSYS_PART_END_COLOR_NOISE, <0.0, 0.0, 0.0>]
It will show random noise with ranging from 0 to 1 on Red channel, no noise on Green channel and 0 to 0.5 on Blue channel. As the particle move toward the end state, that noise will normalize to the base color as all channels are set to zero.