Group by size

[Ungoliant]

Hello everyone, how i can do groups by geometry size, per example, i want have the little chunks of a demolition

thanks

[SpencerL]

Hello everyone, how i can do groups by geometry size, per example, i want have the little chunks of a demolition

thanks

if your "chunks" are a mesh surface, ie 1 prim, then you can use an measure SOP > Area and use that attribute to group by their size. If they are a poly surface, then you could try a For Each SOP to measure the Bounding Box of each "chunk"...Inside the For Each SOP you could get the "size" of the Bounding by measuring the length of two opposite corners

length($XMAX - $XMIN, $YMIN - $YMAX, $ZMAX - $ZMIN)

and then group based on the "size"

[anim]

two other methods

1.

you can use foreach sop and measure sop to calculate area/volume of each chunk directly

inside foreach (filtered by piece* group mask)

-> measure SOP area/volume (it is calculated per primitive)

-> attribPromote SOP area/volume from Primitive to Detail with SUM method

-> attribPromote SOP area/volume from Detail to Primitive with almost any method, say Average

this way each primitive will have area/volume attribute with value of the area/volume of the whole chunk it belongs to

then primitive group by volume attribute treshold ($VOLUME<10 or similar)

(maybe you'll need to create attribCreate SOP before group, just to create AREA/VOLUME variable, so set it to primitive and uncheck write values)

2.

if you have DOP simulation of the chunks you can use "dopobject" attribute created by Dop_import SOP to get mass of each chunk from your dopnetwork by dopfield() expression

then group by mass atrtibute treshold

[TimHart]

Thanks guys, a big help!