Andrew Ghost


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Recent Forum Posts

2 way Sim interaction Dec. 14, 2021, 5:07 p.m.

Hi im newish to Houdini and am trying to get two solvers to interact with one and other.


I have two examples in the attached file one a DOP network and one SOP level using rbdbulletsolver and vellumsolver.

"DOP_SIM": I can get interaction between the velum and the RBD but the RBD fracture happens @ frame 1 rather than when it hits the ground. it must be coliding with the velum?.

"RBD_EXT_SIM" again I can get these two to interact but the rbdconfigure node does not allow the vellum object merge to defroem anf remains a solid "convex bounds" collition. any advice would be greatly recieved.

What im tryign to achieve is a falling glass box full of coloured balls that shatteres on the ground releasing the balls witht he balls pushing the shards and the shards arresting some balls. so a 2 way interaction.

thank you in advance.

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Vex setattrib() not updating.. kind of... April 2, 2020, 11:17 p.m.

I'm playing about with vex at the moment.

I have a question re copy to points SOP and VEX trying to target and manipulate individual copies.

Lets say the pscale of copy ID3 is 2.5 to begin with..

setattrib(0, ‘point’, ‘pscale’, 3, 0, 10, ‘set’);

The geometry spreadsheet now states pscale = “10” and the geo in the scene view is indeed 10 units.

float myscale = attrib(0, ‘point’, ‘pscale’, 3);
printf('%f', myscale);

But this print function still shows “2.5"

What am I doing wrong?


further animate Alembic Files in Houdini? March 6, 2020, 12:41 a.m.

Hi I have an alembic file from Modo that contains “raining cubes” I can get it into Houdini, I can convert the .abc file to an RBD and have the cubes rain down and interact with a ground plane but…. the alembic file acts as a single abject, i.e. the cubes do not bounce individually. after the initial contact with the ground plane, the entire animation shoots up.

perhaps I don't fully understand the limitations of the alembic format?

Any assistance would be greatly appreciated.