wiked lo Posted April 6, 2003 Share Posted April 6, 2003 Hey is there a way to do make the source pop emit all the points at one time? Can I just make $ID all the same or what? Is that even possible ?? Thanks....Jeremy Quote Link to comment Share on other sites More sharing options...
plan9 Posted April 6, 2003 Share Posted April 6, 2003 in impulse activation try pulse($F,1,2) .....set your impulse birthrate to however many points you have, or just set it to a random value refer to your bible in the menu bar ...help > tutorial & user guide > expression cookbook Quote Link to comment Share on other sites More sharing options...
michael Posted April 6, 2003 Share Posted April 6, 2003 note that in Houdini 6 the Expression Cookbook has moved to the ExpressionLang pdf Quote Link to comment Share on other sites More sharing options...
wiked lo Posted April 6, 2003 Author Share Posted April 6, 2003 Thanks guys...I'll give it a shot. Quote Link to comment Share on other sites More sharing options...
Marc Posted April 7, 2003 Share Posted April 7, 2003 Or, if you want them to all birth at the same frame, then $FF==x (where 'x' is the frame number) is what you're looking for. Cheers Marc Quote Link to comment Share on other sites More sharing options...
old school Posted April 8, 2003 Share Posted April 8, 2003 Sometimes you want to duplicate the behaviour of the old particle SOP where you want to birth the exact number of points on a piece of geometry but don't want to use the softbody POP. You can reference in to an object in the Impulse Birth Rate with a npoints() functon: Impulse Activation: $FF==1 Impulse Birth Rate: npoints("/obj/model/my_reference_sop") To explain $FF version of the current frame. It returns a floating point value. An important touch with POPs. If you just use $F which returns an integer frame value and you up the oversampling in pop's, then $F will be true between $F=0.5 to 1.5. That means you will get more particles than you bargained for as POPs will evaluate at the sub-frame level. 1 Quote Link to comment Share on other sites More sharing options...
plan9 Posted April 8, 2003 Share Posted April 8, 2003 awesome old_school, thanks for the explanation! Quote Link to comment Share on other sites More sharing options...
Jason Posted April 8, 2003 Share Posted April 8, 2003 Depending on what you need, you may also just be able to put down a Spring POP and set the spring method to "No Springs". 1 Quote Link to comment Share on other sites More sharing options...
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