The example mentioned above runs smoothly on all major browsers, including Safari on Mac OS. However, it fails to display the correct image on my iPad running the latest iOS 8. Click here for the example.
Similarly, the tutorial provided in the following link does not work properly on iOS 8 either.
Tutorial link here.
What is the best way to showcase panoramic images in webgl on iOS devices?
Check out on iOS and you'll notice that it shows a "Max Texture Size: 4096". Although iOS does support panorama images up to 4096*2048, there seems to be a bug in three.js. My testing has revealed that if a panorama image exceeds the size of 4096, it will automatically scale down to 4096*2048 and render correctly. However, when the image size is exactly 4096*2048, scaling doesn't occur and rendering issues arise.
To address this issue, a simple modification can be made to the function clampToMaxSize in three.js:
Instead of
if ( image.width > maxSize || image.height > maxSize ) {
Use
if ( image.width >= maxSize || image.height >= maxSize ) {
This change allows for proper scaling of images with dimensions 4096*2048. The key operation in the clampToMaxSize function is:
context.drawImage( image, 0, 0, image.width, image.height, 0, 0, canvas.width, canvas.height );
When it comes to mobile devices, they have limitations in terms of texture sizes compared to desktop browsers. In the
webgl_panorama_equirectangular.htmlWhen designing for IOS8 Safari, keep in mind that the maximum texture size is 2048x2048. For panoramic images, a resolution of 2048x1024 with a skybox using six 1024x1024 textures can provide better performance and visual quality.
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