Similar select

[Houdini7]

Hi, 

 

Maya has a similar selection function, which enables you to select some faces and then based on this selection to select other similar faces within a tolerance. 

Is there something similar in houdini? 

 

If not I want to build one myself. 

The idea is to select the outer edges of the selected faces and save the angles between the neighboring edges. Then loop ever all edges and look for neighbour edges which have the same angles within a tolerance. Someone has a better algorithm? 

So for this one needs the following vex functions:

* get outer edges of selection, how? There is a sop from animatrix, which does it. But to make it general one would go over all selected islands, so how to do this? 

* get the neighbour edge clockwise

Or get the points of an edge and then the edges of the point. Which vex functions are helpful? 

 

Thanks in advance! 

[Noobini]

well the outer edges of selection just works out of the box, in the promo, you can also promote to points if you want, note the middle of the eyes will not be selected.

vu_selectionoutside.hiplc

[zlyu]

18 hours ago, Houdini7 said:

to select some faces and then based on this selection to select other similar faces within a tolerance

what you describe reminds Pattern Selection

select a polygon (point/edge) and a next one with Shift

press Shift+P to create Valid Pattern

then > Shift+up arrow/ down arrow key (clockwise and counterclock-wise) (with Ctrl+Shift+up/down > Expand Forward/Backward to End)

or left and right arrows - to grow selection in other directions

with K you may prehighlight selection

and Ctrl+Shift+E > to Select Boundary Edges

 

Edited January 2, 2020 by zlyu

[Houdini7]

29 minutes ago, zlyu said:

what you describe reminds Pattern Selection

select a polygon (point/edge) and a next one with Shift

press Shift+P to create Valid Pattern

then > Shift+up arrow/ down arrow key (clockwise and counterclock-wise) (with Ctrl+Shift+up/down > Expand Forward/Backward to End)

or left and right arrows - to grow selection in other directions

with K you may prehighlight selection

and Ctrl+Shift+E > to Select Boundary Edges

 

Thank you. Select similar works differently. You could select some faces which have unique forms, and then this pattern is searched on the whole object. In many cases pattern selection of houdini would not work in these cases. Could make some pics to clarify. 

[zlyu]

and I do believe SideFX has really cool video about this and more complicated nice stuff

Circle from Edges  

[zlyu]

2 minutes ago, Houdini7 said:

Thank you. Select similar works differently. You could select some faces which have unique forms, and then this pattern is searched on the whole object. In many cases pattern selection of houdini would not work in these cases. Could make some pics to clarify. 

that's a pity it's not what you're after

[AntoineSfx]

Can you provide a screen cap of what it looks like in Maya, especially the topology of the source and target ?

Or.. emulate it manually in Houdini (i.e draw the groups by hand) and provide a hip file.