gaya Posted February 24, 2014 Share Posted February 24, 2014 Hi, Houdini newbie here. I have been trying to "blow away" some points of an animated point cloud with no success. I would like to have control on what part of the point cloud gets applied a force to (I am using particles on each point of the point cloud and grouping them by colour). The problem is: the points number (and position) keeps changing every frame. Therefore the particles keep getting emitted every frame, whereas I want them to stop and leave the "part" empty. I cannot emit only on the first frame (i.e. birth impulse activation $F==1)because I need to keep the movement of the point cloud outside the "part" that I am blowing away.Also, I cannot use the scatter beacuse I don't have primitives and I have to keep the point cloud design.I have attached a file and the bgeo sequence containing 10 frames of the point cloud.It would be really nice to have some feedback from you guys Thank you in advance! OD_Force_Point_CLoud.hipnc ODForce_PointCloud.zip Quote Link to comment Share on other sites More sharing options...
advait Posted February 25, 2014 Share Posted February 25, 2014 Hello, if you dont want the particles to emit after 1st or 2nd frame , just use this expression - if($F<2,1,0) in impulse activation in source in popnet. I think it should work the way you want. Quote Link to comment Share on other sites More sharing options...
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