Tom Velebny

It sort of works, but you have to name the folder $JOB/otls Then you have to set the project, save your file and reopen it. It's probably easier to create a simple package now...

It sort of works, but you have to name the folder $JOB/otls Then you have to set the project, save your file and reopen it. It's probably easier to create a simple package now...

I’m looking into exporting pre-fractured meshes from Houdini into UE5 as a Geometry Collection.

I’d like to use the RBD Material Fracture node to create 3 levels of fractures – Let’s say there’s a sphere that gets fractured in two pieces (L1), then those two get further divided into two (L2) and then each of those 4 pieces gets divided into two once more, to a total of 8 (L3).



This works in UE5 only up to level 2, but not with level 3.

Here’s my level 2 setup (also attached as an HDA), I’m using a combination of @unreal_gc_pieceand @unreal_gc_cluster:

1. All primitives get @unreal_gc_cluster = 2to indicate 2 levels of fractures
   
2. Then selecting primitives by their @namenotation that’s coming from the RBD fracture, I divide them into two clusters:
   @name=piece0-0-*get assigned @unreal_gc_cluster = 1;@name=piece0-1-*get assigned @unreal_gc_cluster = 2;
   
   
   
   However, I am unable to do this with the level 3 fracture, as the primitives need to be in multiple clusters at the same time and that doesn't seem to be possible with the current attributes.
   
   This is the level 3 setup I’d like to achieve in UE5, where I had to cluster the leaf nodes manually:
   
   
   
   The provided example HDAs show multiple levels of fractures, but never with the hierarchy that I'm after, where clusters would split into smaller and smaller chunks.
   
   The documentation [www.sidefx.com] says that "Full control over the exact GeometryCollection hierarchy is not supported at this time", is this one of those cases or am I doing something wrong? If it's the former, do you have a timeline when this could be implemented?
   
   Thanks!