Thin walls: improvement

[supermerill]

Hi,
I just slain my personal dragon by improving the thin wall algorithm.

• no more strange turn at end => fusion of voronoi end lines when they are near enough
• anchoring inside the perimeters => extends the lines end inside the perimeter to join it. A gui parameter can be created to adjust it if needed (currently, it extends to meet the center).
• conservation of too small segments of thin walls when they are crossing each other => modification of the fusion algorithm to select the most strait path instead of a random one
• no more cutting of small walls path by the gcode writer (no_sort for each thin wall extrusion) to have nice long lines of extrusions instead of many smaller.

before:

after:

Do you want a pull request?

for the curious: f685442

[lordofhyphens]

This has been merged into upstream Slic3r

[bubnikv]

@lukasmatena Would you please review this code? Thanks.

[supermerill]

If you want to make a code review, i should create a pull request as all the needed code isn't in this commit.

[wavexx]

Would you make a proper PR for this? I think it would also be helpful also for prusa to keep track of other tweaks you did beyond the mentioned commit (if any).

[supermerill]

I will update it when the one in the mainline branch will be merged.

[wavexx]

There's so much development to love both in slic3r mainline and prusa's fork... 😢
I switch between the two depending on the part I need to print!