Version: 2021.3
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SystemInfo.maxCubemapSize

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public static int maxCubemapSize;

Description

Maximum cubemap texture size in pixels (Read Only).

The largest cubemap texture width and height that your graphics hardware supports.

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

You can only create a texture with the maximum size if you have enough memory. For example, to create a cubemap with a size of 16384 in an uncompressed format such as TextureFormat.RGBA32, you need 6 gigabytes of memory because the amount of data is 4 bytes per pixel × 6 textures × 16384 x 16384.