Fill and how it really works?

[TheSniper (Sam)]

All, Im trying to get my mind wrapped around how fill actually works.
Lets say I have a new drawing.
I draw circles , and more circles within the same circles. lets say 10 of them all offset by say 10mm
and lets say
1:I want to fill every other circle. creating a bulls eye of sorts.
2: I want to fill every 3rd circle.
3: just fill one of the circles.
etc…
How does Light burn decide where to start and where to stop.

Thanks. -Sam

[Rick (Technical Evangelist)]

Have a look at this:

How do I invert (negate) a vector engraving?

If you want to invert a vector engraving (Fill layer) you need to add an outline to it. Think about what happens when you scan a circle, compared to the letter ‘O’. The inner ring of the O toggles the fill. If you add another shape (like a square) outside it, it negates the whole thing: [image] And a slightly different example, this time done by changing the outer line around the design to a ‘Line’, instead of leaving it as part of the Fill layer: [image] In the case above, the design alr…

[LightBurn (Oz)]

All shapes on a single cut layer are treated as though they are boundaries for a single object. Fill works by toggling on / off every time you cross a boundary - that’s really it.

This is why two shapes perfectly on top of each other will cancel out - crossing a boundary twice in the same moment turns the fill on, then off again all at once.