Can someone please advise me on how to retrieve the dimensions of a texture? I have set my texture using the following line of code:
const texture = THREE.ImageUtils.loadTexture(src)
Do I need to load the image in order to obtain its dimensions (and can this be done with JavaScript alone, without involving HTML and div elements)?
I want to ensure that the material I create will perfectly match the dimensions of the texture.
Recently, THREE.ImageUtils.loadTexture has been marked as deprecated in the latest version of THREE.js (r90). It is recommended to switch to using THREE.TextureLoader instead.
Once you have loaded a texture, you can access the image and its properties easily.
texture.image
If your image is in a known format, you can retrieve the dimensions using the width/height properties.
Keep in mind that loading a texture is asynchronous, so make sure to define an onLoad callback function.
var loader = new THREE.TextureLoader();
var texture = loader.load( "./img.png", function ( tex ) {
// In this example, tex and texture are interchangeable
console.log( tex.image.width, tex.image.height );
console.log( texture.image.width, texture.image.height );
} );
If you disable sizeAttenuation and implement a function that resizes the Sprite based on the desired width, the code for this function would look like:
adjustSpriteWidth(width) {
const texture = sprite.material.map;
const scaleY = texture.image.height / texture.image.width;
sprite.scale.setX(width).setY(width * scaleY);
}
This allows setting the scale based on the specified width while maintaining the image's aspect ratio.
In addition, it is necessary to have a function that takes in the camera as a parameter and adjusts the sprite's width based on the type of camera being used:
updateSpriteScale(camera) {
let calculatedWidth = 1;
if(camera.isOrthographicCamera) {
calculatedWidth = camera.right - camera.left;
}
else if(camera.isPerspectiveCamera) {
calculatedWidth = 2 * camera.aspect * Math.tan(camera.fov * 0.5 * 0.01745329);
}
adjustSpriteWidth(calculatedWidth * scaleFactor);
}
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