I'm almost positive this is an easy fix, but rather than spending additional hours on it, I've decided to reach out! I tried to use the Boolean modifier, but it didn't do anything. Am I using the wrong modifier? What's your best solution?
This isn't really a job for a Boolean, if you can avoid it...it's modelling.
One way would be to start with a couple of quads covering the region of interest:
- I inset, by the thickness of the sill, and repeat, by the thickness of the inner rail.
- X delete the inner face.
- AltE extrude all faces along normals, by the depth of the inner rail. For all extrusions, ensure 'Even Thickness' is checked.
- Alt Select the sill face-loop, and extrude to the depth of the sill.
For this result:
I've managed to find my own way through this!
Here's what worked for me:
Create a cube, and duplicate it.
Apply the Boolean modifier, delete the extra cube.
Here are the final results!
You can also join the 2 objects by selecting both and pressing Ctrl+J. Then tab into Edit Mode and select an intersecting face or faces, either the ones on the left or the ones on the right (but not both sides) and press Ctrl+F then select
Intersect (Knife). Notice how they merge.
Then you can easily delete the excess geometry. Sometimes it generates other little funny geometry. Just dissolve any weird vertices that get generated.
And finally make sure to remove duplicate overlapping vertices by selecting all with A and pressing M > Merge By Distance.