CIRCUS RS cannot handle volume larger than 512x512x1024 on typical desktop environment

[smikitky]

Currently, CIRCUS RS stores the entire volume of a series into one WebGL texture.

However, there is a maximum size (width or length) of a texture that can be created on a device. On a Windows desktop machine, a typical value seems to be 16384:

WebGL Caps Viewer: https://www.geeks3d.com/webgl/

$16384 ^ 2 = 512 \times 512 \times 1024$, so this means CIRCUS currently cannot handle a large CT volume that has more than 1024 slices (which is 512 MiB for a 16-bit grayscale image).

If you try to view a large volume that exceeds this limit, you'll see the following error in the browser console:

To work around this, we need to use more than one texture to store one volume.