![]() Right now there is no other way to set this property. You need to change preserveDrawingBuffer: false to preserveDrawingBuffer: true in your p5.js file manually.From that unique colour we can know which object it corresponds to in the real world (left). Then, the mouse coordinates on the first canvas (left) are mapped to the second hidden canvas (right) and we retrieve the color of the pixel under those coordinates. WHAT? Yes, the only difference of this world is that each object was assigned with a unique color. Second –– the quick and dirty, but not so quick, 3D color picking –– is to create an hidden canvas (in the example above the right canvas)Įqual to the webgl canvas of the world and duplicate the world there. There are basically two approaches to do this:įirst –– the mathematical one –– is to take the camera location, and location of the mouse on the screen and ray trace back to the world in order to see where those rays will intercept with the objects. In a 3D webgl environment when you want to click on a drawn object you have to do what is called 3D Picking. The code bellow is available at gist: Webgl 3D Picking in P5js with Colour Buffer Move mouse over the cat cubes to pick one. So lets implement a Colour buffer 3D picking for P5js for our sketches. ![]() P5js has a webgl mode that allows the creation of 3D worlds. ![]() Practical Webgl 3D Picking in P5js: Exploit a Color Buffer ![]()
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