Boolean difference of a Box in Box

[KarlW]

Hi eveyone,
attached, please find a Rhino File of two closed volumes. One of them is completely inside of the other one.
I tried to create a Boolean difference, in order to create a “hollow” Box, but that didn’t work.
I need to do this in Order to calculate the volume correctly. (Not add the volumes, but subtract them from each other).
Is that generally possible?

Or more generally, how does Rhino handle hollow boxes with a “wall thickness”?

Thanks
Karl

BooleanQuestion.3dm (370.8 KB)

Trying to boolean difference the red from the black in order to create a “hollow solid”

[Helvetosaur]

Have a look at this thread…

Given the number of threads on this recently, looks like I might need to make a Wiki page on this…

–Mitch

[Willem (Willem Derks)]

Hi Karl,

Have a look at this topic, it is are about the same issue you have:

Creating a hollow solid object

You can do this in Rhino with polysurfaces. It is generally not recommended, since the result may not behave as expected in other Rhino operations, but should be fine for your purposes. Make the inner and outer polysurfaces. Call NonmanifoldMerge selecting both, Call CreateRegions on the result. Delete the inner region. Chuck Welsh Robert McNeel and Associates

HTH
-Willem

[nozza_paolo]

Hi Karl
Make a micro hole in outer polysurface

–Paolo

boolean Question_PN.3dm (365.8 KB)

[margaret (Margaret Becker)]

@KarlW

Or more generally, how does Rhino handle hollow boxes with a “wall thickness”?

Basically, Booleans do not work on objects that do not intersect.