How merge node work?

[poppy]

Hi, quick question

About merge node. Is it physically merge two surface together (like metal welding) or it just combining (have small "holes" between surfaces).

and

How can I seperate combined mesh, like in Maya.

thanks!

Edited September 10, 2011 by poppy

[sanostol]

the merge node just adds streams of geometry data. the structure keeps the same. no points are merged. if a point shares the exact position with the point of the other geometry, there a two points inthe result

You can seperate a mesh by partitionSOP into groups by attribute. on attribute can be connectivity and there is a connectivitySOP for that. That sop generates a attribute and all primitives that share a polygon island get the same value in that attribute. the partitionSOP uses it to generate the groups. now You can delete the parts that are not needed easily, but You could also delete by an attribute expression

Martin

Hi, quick question

About merge node. Is it physically merge two surface together (like metal welding) or it just combining (have small "holes" between surfaces).

and

How can I seperate combined mesh, like in Maya.

thanks!

[jim c]

How can I seperate combined mesh, like in Maya.

thanks!

One way would be to select the faces you want to separate, and create a group. If you want to isolate just these faces within the same Geometry object, you can just use a Delete SOP, pick the group you made, and select Delete Non-Selected. This will isolate just you selected faces into it's own stream. You can then modify these to your hearts content and merge them back to the main network.

Alternately you can create the group as before, then create a new Geometry object and in this node delete the default file SOP, add an Object Merge Sop and bring in the correct node from your other object.

I've attached a sample hip that does both.

separateFacesEx.hipnc