A Not-Quite Arbitrary Distance Mapping

I suppose the question I should be asking is, how do you reference the x and y components of a sampled image. In the example above, I stuck v in for x and y on a whim and was surprised to get any kind of result. I had tried doing vx, vy = get_sample_grayscale(x, y, Source) but got an error saying dy was a nil value when I provided vy in my function call with vx. I can't recall another script I've seen that features a reference to the x and y from a sample image.

Indigo, I modeled my script after the API Worley Noise script, so my loops follow its example. I didn't really think about step size, and wonder if you have an example where it is used properly I could see?

Good point about how get_sample iterates over an image. Unfortunately, most examples of distance mapping I've seen (in various scripting languages) iterate over x and y per pixel (which I do) and have access to the x and y coordinates you sample the distance from. I'm not sure I'm getting that part entirely right. I'm still learning about transformations in Lua, so I don't quite know what you mean in your fourth point. Can you elaborate?

Thanks for the link! I'll check it out!

Okay, looking at it again, the problem I am running into is tied to the get_sample_grayscale() part, which gives me the value (brightness) of the current sample, but my distance calculations are designed to compare the position of the current sample and the nearest "brightest" point. Without a way of getting the coordinates for that I'm not providing the equation what it needs. Worley noise was working inside a cell grid in some way I'm not understanding very well, but which was defined in x and y coordinates.

I still can't figure out how I get the results I'm getting from a bevel, but I'm guessing it's the result of feeding a value between 0 and 1 as if that was a coordinate. I really wish there were more documentation for Lua graphics scripting. I may eventually sort this out, but it's not going to be easy.