They did that wrong and fixed it in R8.5.
Here is a way.
Plugin:Flexibility
Is this a bug? DeBrep an Extrusion makes 1 untrimmed surface - Grasshopper - McNeel Forum
They did that wrong and fixed it in R8.5.
Here is a way.
Plugin:Flexibility
Is this a bug? DeBrep an Extrusion makes 1 untrimmed surface - Grasshopper - McNeel Forum