michal Posted March 11, 2008 Share Posted March 11, 2008 Hi All, I'm learning Houdini now and met one problem about Point SOP. There are four tabs over there: Standard, Particle, Force & Custom. I can use "Standard" to change colors of points, but when I tried to do something with "particle" & "force", it didn't work. [Grid] | [Popnet] | [Point] I understood that Point SOP can change the velocity & force of those points. I built a SOP Network as above, setting velocity in "particle tab" as (0, -100, 0). But those particles still don't move downward. I also tried with adding some forces to those points but again no effects. Could anyone let me know what's wrong with my understanding? How to use those attributes to affect my points? Tks. Quote Link to comment Share on other sites More sharing options...
shikung444 Posted March 11, 2008 Share Posted March 11, 2008 You have to put the point sop before the popnet, so it can pass those attributes in when it does the particle simulation. If you change the velocity afterward, it will show up in the motion blur, but it won't affect the particle's movement. Quote Link to comment Share on other sites More sharing options...
michal Posted March 11, 2008 Author Share Posted March 11, 2008 (edited) Thanks shikung444. I also got some idea from the book (Magic of Houdini). When I add a velocity attribute and assign its value as (0,1,0), I "didn't animate it up in Y with a value of 1." "This is basically just a characteristic that each point now has that POPs can read and use for particle velocity" What a great description... Edited March 11, 2008 by michal Quote Link to comment Share on other sites More sharing options...
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