It would be ideal if the image was created following some logic, much like how a 3d printer prints a layer. It's fine if it jumps around a bit. Like if I was mapping out 3 overlapping circles, if it only did the three outside sections before jumping to the inside sections, that would be fine.
This will be used just to put a spray paint mark around the outline of the image on walls or hills, they'll be pretty basic images, like silhouettes or line drawings. Because some of these surfaces are quiet far away and not flat, I'll be using this laser at the viewing position and this will make the images perspective perfect from that angle (relatively)
I've currently being doing this with ropes and one person at the viewing angle, this takes time and isn't at all accurate. But from doing it this way, I have learnt that in some places and depending on the image and distance, I can easily have 6 to 12 inches of error.
The real struggle I'm having moving forward with things to try is the fact that my setup needs to be (as far as I figure) like that laser turret I shared in the YouTube video. Where basically it's just two steppers on top of each other, so I can't really use gcode.
Here's an image of something I did with turf on the side of a hill. There's a bunch of tiers on this hill, so imaging the laser tracing this out, I follow along slowly marking this out, then come back later with a mower to finish it up. If the laser can draw that same image pretty well on a wall, it can do the same on the side of the hill and the perspective will hold from that position.
