Group Primatives by UV Tile

[whodini]

Hey guys, I'm looking into a way to group primitives based on their UV tile. I know how to do this in the viewport by switching to the UV view and selecting the faces of the geometry in the tile I want and clicking group in the shelf. However, I'm looking for a way to do this in vops or using an expression. I want a procedural way to do this. I don't know if the tiles are numbered or how I would go about doing this.

[acey195]

well if you are using vopsops you need your UVs to be point UVs (or convert them with an attribute promote) after that you can use something like a floor to to see in which tile the UVs are.

After that you could group the UVs by comparing the floor result with something. You could also use a modulo in between if you want to select every other UV tile for instance.

The same logic applies for using expressions something like floor($MAPU)>0, to select everything beyond the 0-1 range or floor($MAPU)%2==0 to select every other UV tile

for the V direction you can use $MAPV

Edited November 12, 2013 by acey195

[whodini]

thanks! thats a great idea. I'll give it a go

[DanBode]

Another way to do this is to use the Connectivity SOP with connectivity set to primitive, and "Use UV Connectivity" checked on. This will give you a unique class attribute for each connected set of uvs. Then just follow it up with an Partition SOP to make groups based on the class attribute.

[anim]

promote your uvs to primitive (works best from vertex), you may want to keep the original so uncheck Delete Original

then just append Partition SOP and write this as a rule

uvtile_`int($MAPU)`_`int($MAPV)`[/CODE]