Ok, I'm trying to have a particle system with 2 colors - red on left, blue on right, and they blend in between. To do this, I mapped a gradient material onto the emitter plane and looked at this question -
For another particle system WITHOUT metaballs, this worked, however something weird is going on with the metaball emitter such that only the right side color is showing.
The metaball itself, that I emit, has the gradient:
But then the emitted balls are all the way one color:
What is going on here with the metaballs?