MadMax50 Posted February 4, 2019 Share Posted February 4, 2019 hello, I am trying to get rigid clumping in my vellum grains simulation. I have applied a noise to the grains and mapped that to "attractionweight" and "attractionstiffness". Then I made sure to turn the "attraction weight" in the vellum solver to 1. I must be missing something else, but I can't seem to figure out what it is. Seems like it is ignoring my attributes I created. I will attach my scene file for anyone that wants to look. Thank you. vellum_grains_attributes_rd.hipnc Quote Link to comment Share on other sites More sharing options...
MadMax50 Posted February 5, 2019 Author Share Posted February 5, 2019 anyone ? Quote Link to comment Share on other sites More sharing options...
toadstorm Posted February 5, 2019 Share Posted February 5, 2019 The grains attributes you're trying to use are for POP Grains, not Vellum Grains. If you want Vellum Grains to clump, you'll need to set up a constraint network. vellum_grains_attributes_rd_toadstorm.hipnc Quote Link to comment Share on other sites More sharing options...
MadMax50 Posted February 6, 2019 Author Share Posted February 6, 2019 @toadstorm Ah i see. thank you for the file. What would the attributes for vellum be in terms of stiffness. I am trying to art direct some clumping. Do I break the constraints like in a RBD workflow with a sopsolver? appreciate the help ! Quote Link to comment Share on other sites More sharing options...
toadstorm Posted February 6, 2019 Share Posted February 6, 2019 You could use the Cluster Attribute on the Vellum Configure Grain node to make the glue constraints only occur between grains that have an identical attribute value. The Cluster SOP is useful for generating these, or you can create them manually. You can break the constraints manually, or use the Detach Chance / Break Threshold options on the Vellum Configure Grain node to control how the constraints can break during the simulation. http://www.sidefx.com/docs/houdini/dyno/vellumattributes.html Quote Link to comment Share on other sites More sharing options...
logix1390 Posted February 7, 2019 Share Posted February 7, 2019 (edited) . Edited February 7, 2019 by logix1390 Quote Link to comment Share on other sites More sharing options...
MadMax50 Posted February 7, 2019 Author Share Posted February 7, 2019 @toadstormThank you ! Quote Link to comment Share on other sites More sharing options...
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