Using an image as the background for a three.js scene may cause it to appear distorted

I am struggling with setting an image as a background for my scene without it becoming blurry. I have attempted to use the following code:

textureLoader.load("images/background/space.png", function(t) {
  scene.background = t;
});

The problem arises when trying to incorporate lensflare and glow effects, where blending only works if the background is set properly. If I apply the image directly as the canvas's background or add it as a mesh in the scene, everything looks fine. However, due to the need for specific effects, these methods are not suitable.

Including the image as a mesh within the scene causes issues with camera rotation affecting its position, which is not desired. The goal is for the image to act as a stable background element.

The difference in quality between a clear and blurry background is evident. The following images illustrate the contrast:

Blurry:

https://i.sstatic.net/SxlMa.png

Crispy:

https://i.sstatic.net/qBTmb.png

Attempts to adjust properties or set the background in various ways have not yielded satisfactory results. Is there a method to prevent the scene background from appearing blurry?

javascriptcssthree.js

Answer №1

When using Three.js, it is common for images to be resized to a power-of-two (256, 512, 1024, etc...) in order to accommodate mipmapping. If you upload an image that is 857px tall, it will be downscaled to the nearest power-of-two size, which is 512px tall. This downsizing could result in a drop in resolution. There are two solutions to address this problem:

  1. Upload a PNG file that is a power-of-two size. In your case, consider exporting a 2048x1024 image from your source file.

  2. To avoid downsampling, you can disable mipmapping by adjusting the minification filter of your texture to a setting that does not utilize mipmaps, such as LinearFilter or NearestFilter:

var bgTexture = new THREE.TextureLoader().load("images/background/space.png");
bgTexture.minFilter = THREE.LinearFilter;
scene.background = bgTexture;

Disabling mipmapping may introduce aliasing if the texture becomes too small, but should not be an issue if the texture fills the entire background. For more information on minification filter options, refer to the textures constants page under the "Minification Filters" section.

Answer №2

When I encountered a pixelated image and needed to zoom in significantly without any blurring, I found a solution that worked perfectly:

texture.magFilter = NearestFilter

It's important to remember that the key parameter here is magFilter, not minFilter

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