vicvvsh

Hi, you should compute velocity on a box geometry before put it to simulation. Use trail sop.

In the topic from the link there is an example file, called collisionChangeTopo_dv.hipnc and there is one method of retiming by timeshift sop inside it. Also: https://www.cgcircuit.com/tutorial/introduction-to-retime it's free.

Hi, here you can find a possible solution.

Here is a scene, 5 subdivide sop divide a box each frame with Depth = $F and after each subdivision cache geo. It is very heavy for computer's memory so be careful. rops_dependensy.hipnc

If you plug fetch ROPs sequentially without merge ROP and start render from last node it should work.

Did you uncheck "Render Full Range (Override Frame-By-Frame)" checkbox on Alembic Output ROP while you used Fetch ROPs with frame by frame mode?

It does not change and you can easily transform float type to integer it is not necessary to use solver sop for this add_to_group_and_track_age_02.hipnc

Hi, look at the attached file add_to_group_and_track_age_01.hipnc

Hi, here is a hip file with may try. You can control amount of groups on a cluster points sop by "Clusters" parameter and randomization by adjusting "Seed" parm on the same node or on a Sort sop. Random_Groups_01.hipnc

Hi, in your case a Solver sop is the way to go. Stay_Deleted_01.hipnc

Hi, you can pull your animated geometry into chop with Geometry chop node. Then read a value of channels, which are point's coordinate, within a point wrangle using chop() function. https://www.sidefx.com/docs/houdini/vex/functions/chop.html

Hi, in my opinion the simplest way to get vdb with a hole is vdbfrompolygons sop. Just make sure the geo is watertight and walls have depth bigger then 1 voxel's size. I attached a file with examples of how to create VDBs with a hole and use them as collider in flip simulation. vdb_with_hole.hipnc

Hi, why wouldn't using Wire Glue Constraint Dop instead of SBD Constraint?

Hi, you can convert @clumpid to point groups with partition sop and then expend these groups into arrays with expandpointgroup() vex function. set_array.hipnc

You can define directory in houdini.env file, i.e.: MYDIR="/path/to/your/folder" since that you can using variable $MYDIR like $HIP, $JOB etc. Or you can use packages https://www.sidefx.com/docs/houdini/ref/plugins.html