Link Niagara Color User Parameter Component-wise

Technical & Engine Help Unreal Engine Help
#1

Hi there, I have a Color User Parameter in my Niagara system but only want to link to the rgb values for a specific emitter. How might one access these values / link them component-wise? Seems like I can only link the entire linear color from the Initialize Particle | Color Module for instance.

I can break the Color into Vector/Float, and promote the vector as a user parameter but then I lose the nice color widget in the World Details.

#2

Ah, sweet - expressions:

User_parameter_expressions
User_parameter_expressions724×161 13.8 KB

.r .g .b works as well.

Note that if driving from sequencer with .a, the material needs a [ParticleColor] connected to opacity and the [Scale Color] module is needed in the particle update group in addition to initializing the default Color so as to update the alpha for fadein/fadeout.