Version: 2022.3
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public static int maxTexture3DSize;


Maximum 3D texture size in pixels (Read Only).

The largest 3D texture width, height and depth that your graphics hardware supports.

Unity only supports textures up to a size of 16384, even if maxTexture3DSize returns a larger size.

You can only create a texture with the maximum size if you have enough memory. For example, to create a 3D texture with a size of 2048 in an uncompressed format such as TextureFormat.RGBA32, you need 32 gigabytes of memory because the amount of data is 4 bytes per pixel × 2048 x 2048 × 2048.

Additional resources: maxTextureSize, Texture3D.