Add a simple subtle outline effect by drawing back faces using wireframe mode

[Noisyfox]

This should improve the contrast of the edges and make features more visible.

Some comparisons:

[Eldenroot]

Wow, nice!!

[kylek29]

This has been a longtime needed feature, even for PrusaSlicer. You can't see much with many colors of filament. Much appreciated.

One question, how does it look with a black filament color? Does the effect still work to make things more visible?

[Noisyfox]

One question, how does it look with a black filament color? Does the effect still work to make things more visible?

That's a good question, will take a look.

[Noisyfox]

I've updated the algorithm so that it shows white outline for dark color and black outline for light color. It's still not perfect but I think it's a lot better now.

[SoftFever]

Awesome

[igiannakas]

Think it's not working 100% right on Mac? Is it supposed to be red in colour? It also seems to change colour when I change the filament to another but the colour selection doesnt make sense :)

Also observing some polygon clipping:

[igiannakas]

Also on the printer image it’s showing the lines

[Noisyfox]

Think it's not working 100% right on Mac? Is it supposed to be red in colour? It also seems to change colour when I change the filament to another but the colour selection doesnt make sense :)

Also observing some polygon clipping:

It's expected to also show these outlines in the thumbnail (because I didn't disable the outline when rendering the thumbnails), however the colors are far off. It should be black or white, not red or purple.

[Noisyfox]

And yes current algorithm will cause some extra artifacts on broken model that has non-manifold edges/non-closing faces etc, though this happens on old versions as well:

So it's not really the issue of this PR. The only difference is now it renders not only flickering faces but some extra lines (due to the render of backface wireframes)

[igiannakas]

And yes current algorithm will cause some extra artifacts on broken model that has non-manifold edges/non-closing faces etc, though this happens on old versions as well:

So it's not really the issue of this PR. The only difference is now it renders not only flickering faces but some extra lines (due to the render of backface wireframes)

Gotcha. Colors though are weird. Yours look soooo much better :D

[Noisyfox]

Yeah I'll take a look at the color issue.

[Noisyfox]

Btw, m1 mac or intel mac?

[igiannakas]

Btw, m1 mac or intel mac?

M1 Pro 14 inch

[igiannakas]

So this one also causes significant performance issues on M1 Pro/Max laptops when rendering complex high polygon models. See comment here:

#2905 (comment)

[Noisyfox]

So this one also causes significant performance issues on M1 Pro/Max laptops when rendering complex high polygon models. See comment here:

#2905 (comment)

Yeah and it also has color issue on m1 macs. I think I'll have to disable this on m1 macs then.

[SoftFever]

It's not working well for some models on Windows as well.
I think we'd better make it a option and turn it off by default @Noisyfox

[Noisyfox]

It's not working well for some models on Windows as well. I think we'd better make it a option and turn it off by default @Noisyfox

Well this is exactly what it should look like with current approach. It only adds outlines to places where front face and back face shares the same edge, not based on the relative angle between two faces.

[SoftFever]

After discussing with @Noisyfox, we decided to revert this change for now.

[Eldenroot]

Works Fine on win. What About to add a new settings to enable/disable?