icreateeffects Posted December 22, 2016 Share Posted December 22, 2016 (edited) Hi, I have been trying to deform scatter point over the surface of the geometry, What would be the way to deform or slide scatter or give slide scatter points with offset over time on the surface of the geometry ? I have tried with color texture and it worked, but i am looking forward for the VOP method, can someone guide me over that ? I am still to houdini and trying things out. Thank you, Edited December 22, 2016 by icreateeffects Quote Link to comment Share on other sites More sharing options...
Sepu Posted December 22, 2016 Share Posted December 22, 2016 I do not get your question what do you mean "deform scatter point". if you put a scatter after a the geo has been deform or animated the scatter points will deform with the Geo. Or you mean offset the points up in Y. Sorry I do not get what you are trying to say, can you post what you got so far. Quote Link to comment Share on other sites More sharing options...
shawn_kearney Posted December 23, 2016 Share Posted December 23, 2016 Do you want points to move around on surface? You could use Scatter SOP and animate a density attribute or use VDB Advect Points SOP. Quote Link to comment Share on other sites More sharing options...
icreateeffects Posted December 23, 2016 Author Share Posted December 23, 2016 2 minutes ago, shawn_kearney said: Do you want points to move around on surface? You could use Scatter SOP and animate a density attribute or use VDB Advect Points SOP. yes, that is exactly what i am looking forward to, move my point over the surface. Quote Link to comment Share on other sites More sharing options...
shawn_kearney Posted December 23, 2016 Share Posted December 23, 2016 (edited) Ok. The easiest way i can think of would be to take a scalar (1-dimension/greyscale) noise, write it to an attribute called 'density' using an Attribute VOP SOP and attach it to a scatter node, then check 'density attribute'. By offsetting the noise to time (you need to pass it through a float to vector node) you'll get animation. This can give the appearance of movement by changing the density of the scatter, though the points do not actually move. If you need points to move then VDB Advect Points is what you'll need, but it's a bit more involved to set up and how you calculate your velocity field will depend on the effect you have in mind. I'm sure there are also ways top get POP particles to slide along geometry, too. But I prefer VDB Advect Points. Edited December 23, 2016 by shawn_kearney Quote Link to comment Share on other sites More sharing options...
shawn_kearney Posted December 23, 2016 Share Posted December 23, 2016 Here is a VDB Advect Points example: vdb_advection.hiplc Quote Link to comment Share on other sites More sharing options...
br1 Posted December 23, 2016 Share Posted December 23, 2016 Maybe this setup can help you out. It shows you how it's done in XSI and Houdini : Quote Link to comment Share on other sites More sharing options...
icreateeffects Posted December 23, 2016 Author Share Posted December 23, 2016 2 hours ago, br1 said: Maybe this setup can help you out. It shows you how it's done in XSI and Houdini : Thank you for the video, I am looking for scatter move over surface using noise. Quote Link to comment Share on other sites More sharing options...
icreateeffects Posted December 23, 2016 Author Share Posted December 23, 2016 I have tried this with colour texture, I am uploading the file so you can get the idea what i am looking forward to. thank you. Sphere_Scatter_Movement.hip 1 Quote Link to comment Share on other sites More sharing options...
Sepu Posted December 23, 2016 Share Posted December 23, 2016 Here you go. If you want to do in Vops just add a noise to Color. Sphere_Scatter_Movement_v2.hipnc 1 Quote Link to comment Share on other sites More sharing options...
icreateeffects Posted December 23, 2016 Author Share Posted December 23, 2016 44 minutes ago, Sepu said: Here you go. If you want to do in Vops just add a noise to Color. Sphere_Scatter_Movement_v2.hipnc Thank you, It seems pretty simple now. I wasnt converting my float values to vector, maybe thats why it wasnt working. Thank you Guys @Sepu, @br1 and @shawn_kearney Quote Link to comment Share on other sites More sharing options...
icreateeffects Posted December 23, 2016 Author Share Posted December 23, 2016 I have tried another method with the help of my friend using sdf geometry and attribute vop. you can have a look at the file. test_Sphere.hip 1 Quote Link to comment Share on other sites More sharing options...
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