If I import an obj fie that has multiple objects and directly export (with zero changes) to a Geometry ROP as a Obj I lose the hierarchy when I take it back into other packages, it is from that point one solid object. I DO NOT WANT TO EXPORT AS ANY OTHER FILE TYPE. OBJ ONLY. Can anyone help?

I'm not sure .obj can hold such information, it's a relative simplistic geometry format
it can hold named poly groups that would come in other packages as flat objects

or do you have an example of .obj file that contains hierarchy that you exported from another package and trying to match?

tamte
I'm not sure .obj can hold such information, it's a relative simplistic geometry format
it can hold named poly groups that would come in other packages as flat objects

or do you have an example of .obj file that contains hierarchy that you exported from another package and trying to match?

Okay attached so attached is two screen shots,

1. What we export from Cinema then import into Houdini
2. What we export from Houdini back into Cinema

"two_objects.obj" is directly from Cinema with a hierarchy.
"two_objects_Exported.obj" is directly exported from Houdini without a hierarchy.

Vincent Griffith

VGriffith
If I import an obj fie that has multiple objects and directly export (with zero changes) to a Geometry ROP as a Obj I lose the hierarchy when I take it back into other packages, it is from that point one solid object. I DO NOT WANT TO EXPORT AS ANY OTHER FILE TYPE. OBJ ONLY. Can anyone help?

While obj supports tagging of groups and objects within one file, Houdini does not support exporting multiple objects in one obj export.

jsmack

VGriffith
If I import an obj fie that has multiple objects and directly export (with zero changes) to a Geometry ROP as a Obj I lose the hierarchy when I take it back into other packages, it is from that point one solid object. I DO NOT WANT TO EXPORT AS ANY OTHER FILE TYPE. OBJ ONLY. Can anyone help?

While obj supports tagging of groups and objects within one file, Houdini does not support exporting multiple objects in one obj export.

Wow that sounds like a very basic level thing that Houdini should support.

VGriffith

jsmack

VGriffith
If I import an obj fie that has multiple objects and directly export (with zero changes) to a Geometry ROP as a Obj I lose the hierarchy when I take it back into other packages, it is from that point one solid object. I DO NOT WANT TO EXPORT AS ANY OTHER FILE TYPE. OBJ ONLY. Can anyone help?

While obj supports tagging of groups and objects within one file, Houdini does not support exporting multiple objects in one obj export.

Wow that sounds like a very basic level thing that Houdini should support.

https://www.sidefx.com/bugs/submit [www.sidefx.com]

FBX and Alembic exports the groups as objects and keeps them when importing in Cinema 4d.