And @siemen replied…
You will have to add some geometry at the bottom side so you can close it.
But what does the bottom have to do with projecting or cutting a shape from the middle of the cube?
And the final object will have no material thickness?
The goggles to be on the lampshade. that is the expected result.
Are you going to 3d print this object or just render?
I don’t know how to change thickness of material yet. But light needs to pass through
Yes I plan on 3d printing this
Good luck
Ok I still haven’t found out how to add the goggles can you guys help
As @siemen wrote you might have to explode and join the parts into one polysurface and then split or trim both parts
For Boolean Union to work correctly you ideally have 2 closed shapes. If you don’t, you might run into issues because Rhino doesn’t know what the inside or the outside of your open shape is therefore it cannot determine what part to keep from the other shape so it just guesses. That being said, Boolean union seems to give the correct result in this case after you removed those internal naked edges.
Alternatively you can look into the Split & Trim command to get what you want.
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How thick does the material have to be to print and how thick is my material?
Ok I just increased the material thickness to 0.1 by doing offset srf. Is 0.1 thin enough to allow light to pass through?
You’re going to print 0.1mm?
No, that’s for printing on paper. You’ll have to use OffsetSrf (with Solid=Yes) or Shell to create geometry that has actual thickness to it. The thickness required depends on the material, colour, printing technique and - perhaps most of all - the light source inside.
HTH, Jakob
I see you deleted the post with the file…
Can’t help you, sorry