[Sidefx-houdini-list] grid motion

François Duchesneau houdini at trinix.ca
Tue May 23 23:38:58 EDT 2017

Hi Gary,

An easy way would be to convert the line on the grid to an sdf. From 
there it's easy to sim the particles with all the randomness your need 
and constrain them to follow a very tight range within the sdf.

You can also do the same kind of snapping by using the XYZ Distance and 
the Get Primitive functions in a vop pop to force your particles to 
always stick to the closest point on the grid lines.

Either way you may have to recalculate the velocity based on the real 
displacement of points after the snapping using the pprevious and P. But 
it's possible that this kind of accumulated velocity gives nice 
randomness in the motion depending on what you're after. Adding a force 
noise on top of an attraction force to the center may create something 
interesting as well.

Good luck


On 05/23/2017 10:55 PM, Gary Jaeger wrote:
> I have something I’ve been puzzling over and can’t solve. Imagine a grid of points, say on the xz plane. The points are evenly spaced in a grid. The points will all move towards 0,0,0, but they can only move on either the x or z axis at any given time. In other words, they move along the grid lines. Add to that some randomness so they don’t all follow the same or similar paths.
> How would you solve this? Thanks for any help.
> Gary Jaeger / 650.728.7957 direct / 415.518.1419 mobile
> http://corestudio.com <http://corestudio.com/>
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