yeteatime Posted September 10, 2019 Share Posted September 10, 2019 Hi! Houdini beginner here. I created a custom velocity using pointVOP and added onto VDB surface attrib point.v as vel. When I middle-mouse click, it shows that vel exists. I have it scaled higher than 0 on the volume source in the DOP network and set "Add" for the operation option, but it makes no difference in the smoke sim. There's supposed to be a noise pattern in the velocity, but it's only taking into account of gravity. If I disable the gravity, nothing happens to the volume (the volume surface get steppier? but it doesn't push the smoke or anything). There's also a custom temperature going into DOP, but that one works fine. So I think I missed a step somewhere when bringing the velocity into the DOP network.....What am I missing? Thank you!! Quote Link to comment Share on other sites More sharing options...
evanrudefx Posted September 10, 2019 Share Posted September 10, 2019 could you post scene? kinda hard to say whats wrong with out looking at it. Quote Link to comment Share on other sites More sharing options...
yeteatime Posted September 10, 2019 Author Share Posted September 10, 2019 Hi! Here are the geo and the hip file (I deleted the custom temperature part to clean up the file). Thank you for a taking a look at it! rhinogeo.bgeo.sc smoke_sim_vel_mystery.hipnc Quote Link to comment Share on other sites More sharing options...
evanrudefx Posted September 10, 2019 Share Posted September 10, 2019 (edited) hello! I made a few changes, I changed the vector type to displacement/velocity/acceleration. The reason it wasnt working was the source volume was set to v (on volume source dop), but it should have been vel to match the vdb : ) hope this helps smoke_sim_vel_mystery_fixed.hipnc Edited September 10, 2019 by ejr32123 1 Quote Link to comment Share on other sites More sharing options...
yeteatime Posted September 10, 2019 Author Share Posted September 10, 2019 Ohhh!!!!! Ahhh you are a life saver I was struggling for like hours x.x Thank you so much! 1 Quote Link to comment Share on other sites More sharing options...
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