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Vary MPM granular_particles display scale

Message 1 of 4
464 Views, 3 Replies

Vary MPM granular_particles display scale

Hi. I'm new to the Bifrost graph.


I'm simulating MPM with a source_mpm_snow, outputting the granular_particles to a .bob cache, then rendering the results. I would like to adjust and randomize the size of the particles, preferably after the simulation has been cached.


The only thing I've figured out is to adjust the particle_display_scale in the source_mpm_snow, but I can't figure out how to create variation, and I can't figure out how to adjust the particle sizes after the simulation. Any tips?

Message 2 of 4

Since you are looking to do this as a post process, you can just modify the point_size property on the MPM particles after you load back in your cache. Just use get_geo_property to fetch the array of point sizes, modify them e.g. using a noise node and use set_geo_property to save them back.

Message 3 of 4

That did the trick, thank you very much! I'll attach a screenshot of my solution, for anyone who's interested.

Message 4 of 4

Aaactually - I now realize I'm not quite there yet. (Is there a way to un-solve a thread?)


The method I used does vary the individual particle sizes... every frame. I would like to set a persistent point_size per point for the duration of the simulation, but can't seem to figure out how to get that to work, either.  

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