[Sidefx-houdini-list] POP's: best way to threshold particle emission based on an point attribute

Miles Green Miles.Green at al.com.au
Mon Nov 15 18:41:22 EST 2010


Hi,
 does anyone have any recommendation's for the best/fastest/most 
efficient way to birth particles from polygons based on a custom point 
attribute?

the two methods I currently have are;

1)  inherit the custom attribute into pops via the source node, then 
follow it with a  kill Node that checks if the custom attribute is under 
a certain threshold
  - NOTE: this seems wasteful to me as the particles are created and 
then killed

2) use a scatter  in sops before the popnetwork to create birth points 
on the poly, and then use a delete Node to delete those points where the 
custom attribute is under a certain threshold
 - NOTE: this seems slower than solution (1)  above

I ideally would like to use the custom attribute directly in the popnets 
source node to specify that particles never get created if the custom 
attribute is below a certain value

thanks for any help
  Miles



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