Glenn Dawick

Thanks for your reply VortexVFX, it sounds pretty complicated! Something time won't allow on this particular project unfortunately, but I'd love to hear if you ever come up with a solution in future.

Hi there, I'm trying to figure out a way to collide flip particles with a shaped container, without having to calculate the full exterior edge of the pool collision.

This is a much smaller version of a very high res sim. I'm trying to work out if the entire inner edge of the pool container shape is necessary to sim, or is it possible to sim just the narrow band surface and still collide with the custom shaped container.

Two examples shown here.. First is a narrow band custom shaped container - Water does not collide.

Second is a narrow band container with custom pool collision shape - Water does collide, but seems unnecessary to simulate the entire surrounding edge.

Is there another way to get the result I'm after, without having to calculate the full exterior of the pool shape?

HIP file attached.

Solved with some help over on the Odforce forums.


Offsetting the volume .bgeo sequence is easy enough, as long as the volume LOP Sampling Behaviour is set to the length of the .bgeo smoke cache.


Offsetting the geometry / particle .bgeo sequence has a few more steps.
The Geometry Sequence LOP requires an Import Path Prefix:


The Cache LOP should be set to Always Cache All Frames and the length of the .bgeo sequence should be set:


The Instancer LOP needs the same Prototype Primitive path that has been set on the Geometry Sequence LOP:


.hip file and small .bgeo caches attached for anyone interested.