[BUG] Mesh rasterization seems to fail for complicated multi-part drawing

[JosephCatrambone]

Description When converting the following drawing (for finger cutouts in a block), the rasterized mesh does not match the shape of the drawing.

To Reproduce Steps to reproduce the behavior:

1. Seems to happen when using arcs and midpoint constraints. If I put the center of two arcs on a line and constrain the line to a midpoint (or to some distance from a point) then the solution that materializes is not expected. Don't have a perfect approach to reproducing yet, but here's another example of a mesh that fails to rasterize:

Expected behavior I would expect for a rounded arc to be

Screenshots Above

System Information:

• OS: Linux Mint 20.04
• Blender Version: 3.1.0
• Addon Version: 0.20.0

Blend File is Attached.

hand_keyboard.blend.zip

EDIT: In the blend file the last drawing is not fully constrained, but it doesn't make a difference when I do add the remaining constraints.

[teddywaweru]

the issue could be the lines that are joining the arc, & the line between the arcs & the rectangles. I may be wrong but the developers may have set up the add-on to recognize everything apart from construction lines as potential geometry. So this affects

so in the above, the left doesn't have the joining line between the arc & rectangle, while the second one does. I'd say the base principle is that any lines in the sketch will be regarded as active geometry when generating the mesh. All distance constraints would be kept as construction lines

[hlorus]

@teddywaweru is right here, the converter tries to create closed bezier splines to figure out what area to fill, if there's a junction it has to guess which path to use as the main path. There's some more info in the docs, see:

https://hlorus.github.io/CAD_Sketcher/integration/

Anyway there seems to be another issue so leaving this open for now.

[JosephCatrambone]

Good catch. I missed marking that as a construction line. I wonder what a good way to communicate disconnected paths would be. 🤔 Could perhaps mark 'open' bezier curves in a different color.

[hlorus]

This seems to be working with recent versions when marking the inner lines as construction.