Currently, I'm working with version 73 of V. I am dealing with UV coordinates obtained from the intersection of a raycaster and a texture of an object. Is there a way to extract the color (RGB or RGBA) of the used texture at these specific UV coordinates?
I attempted to retrieve the pixel value from the image in the texture, but unfortunately, this method was consuming excessive memory.
To ensure optimal performance, it is recommended to retain your texture's images. During initialization, for each image that will be converted into a texture, create a duplicate of its data using the following method:
// set up a canvas with the same dimensions as the image
some2dCanvasCtx.canvas.width = img.width;
some2dCanvasCtx.canvas.height = img.height;
// draw the image onto the canvas
some2dCanvasCtx.drawImage(img, 0, 0);
// copy the canvas contents
var texData = some2dCanvasCtx.getImageData(0, 0, img.width, img.height);
With the UV coordinates at hand, you can easily retrieve the corresponding color by:
var tx = Math.min(emod(u, 1) * texData.width | 0, texData.width - 1);
var ty = Math.min(emod(v, 1) * texData.height | 0, texData.height - 1);
var offset = (ty * texData.width + tx) * 4;
var r = texData.data[offset + 0];
var g = texData.data[offset + 1];
var b = texData.data[offset + 2];
var a = texData.data[offset + 3];
// only necessary if UV coords are outside the range [0, 1]
// for CLAMP_TO_EDGE, ensure to clamp UVs within this range instead.
function emod(n, m) {
return ((n % m) + m) % m;
}
If needed, WebGL can provide the texture color using the values of tx and ty. Refer to this answer for more details.
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