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Suggestion of a function to get screen coordinates #7059
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I think this could make sense to add, anecdotally it's probably the question I've been asked the most about p5, although not exclusively to WebGL, so 2D mode could feasibly implement something like this too. @limzykenneth any thoughts on naming? Flash used to have methods like (Also, I reopened the issue, was it intended to be closed?) |
FYI - I brought up this issue with @bohnacker years ago (while attempting to port a Processing lib to p5.js that depended on screenX/Y/Z) and they came up with the following solution (I'm not sure if it's been submitted for the upcoming new website (of which all existing ones should be auto-ported incase authors didn't see message to submit) – would of course be great to have them built in! |
After I came up with the idea, I lost motivation, so I closed it. |
I too agree to this , it would be nice to have such a function. |
Having a function like this will help contributors create new methods, like I did in #6116. I also think it is useful because it can be used to place visual information in 3D space. 2024-06-03.21-46-57.mp4 |
Increasing access
Proposal to implement functions like screenX(), screenY(), screenZ() in processing.
I often see suggestions that p5.js also needs a function to calculate screen coordinates.
I thought it would be good to have such a function, even if it's not the method I proposed here.
Most appropriate sub-area of p5.js?
Feature request details
I thought of a function like this:
This is a function that calculates screen coordinates and depth values from 3D coordinates for the currently set camera.
Screen coordinates are values based on the coordinate system of the 2D canvas, and depth values are 0 for near and 1 for far.
This kind of technique is actually already used in the p5.js library.
In #6116, when I improved orbitControl, it became necessary to obtain normalized device coordinates, so I implemented functions by suggestion of dave pagurek.
The method used here is based on that method.
"getNDC" is a temporary name and has no particular meaning. I think it needs to be changed with a proper name.
getNDC demo
2024-05-19.09-02-24.mp4
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