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Before I spend hours trying to get this working in some way I thought maybe there's a only a simple "No" to my question.

I want to use a Superspray in 3d studio max and add an emitter material to the particles. Now Maxwell halts the rendering and says that Extension Objects are not supported yet. But is there a way to get around this? Maybe the particles from realflow are suitable or there's way to bake the particles animation so Maxwell sees them as objects? (I'm just guessing here)

Anyone experience with this?

Try using a Shape Instance as the particle type, then apply an emitter material to the instanced geometry. I haven't tried it, but it may work. MxParticles extension doesn't yet support an emitter material.

I tried that in the meantime but unfortunately it didn't work.. I just remembered that I've tried this a few years back and it worked the way you said it to. But in that version of Maxwell Motion Blur Steps weren't a feature yet so I couldn't get the effect that I wanted. Too bad particles aren't supported yet.. I could think of a few effects it would serve pretty well, especially with motion blur

The solution would indeed be to use PFlow instances, but it seems there's an issue with their motion at the moment. With 2 motion steps the movement is correct (but linear, of course), but it breaks down if you increase the number of steps. We'll look into this and try to solve it for the next build.

Yes that seems to be working, but as you already stated, only with 2 steps.

We'll look into this and try to solve it for the next build.

That would be very nice, to say the least!