What is the purpose of SYSTEM.maxTextureWidth

[cl1069573062]

l see __createEquirectangularTexture means
if image width > SYSTEM.maxTextureWidth will resize image
but l only use createTexture(img), don't resize image , and is work
so What is the purpose of SYSTEM.maxTextureWidth , and resize image means

[mistic100]

This is is the maximum WebGL texture size supported by the device, generally 16384 on desktop and 4096 on mobiles. Bigger textures results in a black image.

And because the resize is done with a canvas it also depends of the maximum canvas size found with SYSTEM.getMaxCanvasWidth() (this is not a system constant though and found by trial and error)

[cl1069573062]

I uploaded an image size larger than 4096 pixels on my device, and my device maximum WebGL texture size is 4096.
l comment out this part of the code don't resize image，But it still works，It's confusing to me

Sample Pictures 8000 * 4000

[mistic100]

Do you see a console warning saying "THREE.WebGLRenderer: Texture has been resized from" ... ?
This is performed by THREE.js itself https://github.com/mrdoob/three.js/blob/dev/src/renderers/webgl/WebGLTextures.js

Perhaps when I started/forked this project, THREE.js did not handled it, or I did it myself to avoid the warning. I don't remember.

Either way the resizing is required.

[cl1069573062]

I understand. Thank you very much。