Выдержка из оригинальной справки. (NDL Gamebryo 1.1)
The "Particle Color" and "Particle Opacity" fields should only be used for materials that are applied to a particle system. Both fields will only accept a "Particle Age" material and together allow particles to change color and opacity as they age. For "Particle Opacity" the r,g,b values in the "Particle Age" material will be averaged together to yield the required alpha value.
