How do I only rotate a particles alpha and not the emissive?

When I rotate a particle in Cascade I would like it to only rotate the materials alpha channel and keep the emissive upright. Is there a way to do this?

Hey DavidM -

This is a great use for a Dynamic Parameter to control the time variable in a Rotator in the Material Editor. Here is a setup showing both with the whole Particle rotating and with just the alpha channel rotating.

Thank You

Eric Ketchum