[Sidefx-houdini-list] particle gnomon query on a flocking system

Andrew D Lyons tstexture at gmail.com
Wed Jan 26 11:34:19 EST 2011

I noticed that recently as well ( while teaching a class ). I'm pretty sure
that's broken/changed behavior.


On 26 January 2011 02:43, Phil Spicer <PSpicer at bournemouth.ac.uk> wrote:

> Hi,
> I have a simple flocking system which appears to work fine. When I copy
> geometry onto the particles, it aligns correctly with the direction of
> particle travel.
> If I activate the particle gnomon display however, all the particle gnomons
> appear aligned to world space. The particles move as before, but the gnomon
> display is not aligned with the direction of travel.
> I am wondering therefore why this is occurring... As said, the copy sop is
> aligning geometry to the direction of particle travel but ignoring the
> gnomon direction. Where is the copy sop getting this alignment information
> from?
> In H10 the particle gnomon and direction of particle travel were aligned,
> making checking the rotations of flocking particles simple to see at POP
> Level. Has anything changed? I have tried assigning a Rotate POP to brute
> force a random gnomon direction for each particle before it feeds into the
> follow and interact POPS; however this makes little difference. The
> direction of travel created by these operators again does not match the
> rotated gnomon display.
> Any thoughts welcome.
> Kind regards,
> Phil.
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Andrew D Lyons | Digital Artist | http://www.tstex.com

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