Union/Subtract shell shapes

Rhino Rhino for Windows
1

Hi,

I’ve made two offset ‘shell’ shapes, one is a one side open beam and the other a mountain like shell shape.

I want to join these two shape so the side where the beam and the bottom of the mountain, creates a the whole for the shape.

To make it more clear what my endgoal is, I want to make chocolate shapes like the picture added.

Mesh > union doesn’t work.

Untitled
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Goal of my project

https://www.google.be/url?sa=i&rct=j&q=&esrc=s&source=images&cd=&cad=rja&uact=8&ved=0ahUKEwjS9P2185jXAhVNaVAKHe7DBNMQjRwIBw&url=https%3A%2F%2Fwww.aliexpress.com%2Fstore%2Fproduct%2FCheap-bakeware-chocolate-making-tools-plastic-chocolate-mould-kitchen-accessories-decorations-leaf-chocolate-molds-pastry-moulds%2F1862142_32626844192.html&psig=AOvVaw3R7Uck0_pA0sQF05NiW8aw&ust=1509471957131179

2

Hello - it’s hard to say without a file to look at but if you are usnng meshes, MeshBooleanUinion/Difference/Intersection is probably what to use, probably, but I would not use meshes in Rhino as a rule - there are not a lot of tools for mesh modeling and the mesh intersection ‘guts’ needed for trimming and Booleans is, well, weak in Rhino.

-Pascal