Group by primitive size

[Homer0]

Hi all, i'm trying to create a primitive group based on the size of geometry primitives.

In old version of Houdini, i recall i could use a Group sop, set it by Expression and use this: length($SIZEX,$SIZEY,$SIZEZ) > V ; where V is the size value to filter with.

Now in houdini 16 i have to use the GroupExpression sop, but it can read only vex, and i'm having trouble with it. I found in the help file that there still is a Length (vector) function, so i tried this: length (@size.x,@size.y,@size.z) > V, but it doesn't seems to work...

any advice on how to solve this?

[Homer0]

ok maybe i solved it; instead of using the GroupExpression node i used an attributeWrangle with:
 

v@min = {0.0, 0.0, 0.0 };
v@max = {0.0, 0.0, 0.0 };
getbbox(@min,@max);
v@size = @max - @min;

f@tsize = @size.x + @size.y + @size.z;

and AFTER that, i used the groupExpression node with:

@tsize > X

where X is the value i want to filter with

I could create the group in the wrangle itself, but i found more confortable the group node cause it highlights whatever is inside the group.

 

It seems to work now, but if you have other ways it's always good to know ^^

[Noobini]

why not use a Measure, then @area>blah ?

(of course, don't forget to switch to area in Measure)

Edited July 26, 2017 by Noobini

[Homer0]

i tried that, it works too ^^