[Solved!] Shadow raycast polygon fail (Help!)

[alucherdi]

Hi! I'm having some problems creating a shadow raycast library.
The raycast is working perfectly

But when I try to draw the shadow polygon it looks like the love.graphics.polygon is sort of "jumping" some of the points of the raycast


Here's the code:
https://github.com/Alucherdi/Love2d-sha ... ee/develop

I hope you can help me with my problem, feel free to ask any question, I'll answer as soon as possible. Thanks!

[raidho36]

If the polygon is a triangle fan, its first point must be in its center (i.e. where rays start), otherwise overlapping will occur, as seen on your image.

[s-ol]

If the polygon is a triangle fan, its first point must be in its center (i.e. where rays start), otherwise overlapping will occur, as seen on your image.

And the Polygon must be "simple". There's a love.math function to tesselate complex polygons into multiple simple ones i believe.

[davisdude]

Yes, love.math.triangulate

[raidho36]

It's not gonna be needed for this particular use, since it generates perfectly good triangle fans as it is.

[alucherdi]

Ok ok let me do some test with that information

[alucherdi]

Btw, it's not a triangle fan, I sort the angles and then make the polygon with the intersections. The first point in the center actually kind of worked! but there is a gap between 2 points. I also tryed to initialize the polygon points table with the last intersection but the overlap come back

[raidho36]

You just add that point again so that the triangle fan closes.

Also yes it is most definitely a triangle fan.

[alucherdi]

It's not!, when I draw the polygon the points that intersects don't return to the origin uwu, and it worked! thanks a lot!!



Thanks a lot, I'm pushing in git with the results

[davisdude]

I guess technically you're generating a triangle fan, but you're drawing a polygon.