Spline and Bevel Problem in the inner edges?!

[xeonow]

Hi guys, hope you can help me. I would like to model a window frame and my first thought was to use a spline and a profile. on the first look it looks ok, but in the inner edge there are some problems in the geometry.

any ideas how i can make the inner edges “merge together” or something like this?
converted to a mesh it looks like this:

thx for your time!

[Stan_Pancakes (Stanislav Blinov)]

It would seem your Frame curve has too many points. It really shouldn’t have any other than at the corners.

[xeonow]

the frame is curved on the top

if i reduce the resolution to 1 the corners are fine. i can convert to mesh and bevel the uper edges by myself, but i guess its not the best way…

resolution 1:

this is the result i would like to archive on the downside of the frame
but the upside looks then like this:

but should look like this:

[Stan_Pancakes (Stanislav Blinov)]

Nono, just make the sharp corners a Vector handle, and put Vector handles around them as well. Segments between Vector handles won’t be subdivided.

[Format64]

Handle types affect resulting geometry:

In this example both curves have similar profile but one on left has end handles set to Vector.

profile_vector_handles.blend (176.9 KB)

Also you can enable fireframe overlay to see how geometry gonna look like without converting to mesh.

[xeonow]

thx! i also got the tipp to view the model in the wireframe mode.
now i understand what the problem is.
yes i can solve this with the vector and a lower resolution!

thx guys!!