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Showing content from https://docs.unity3d.com/Manual/sprite/../../ScriptReference/Cubemap.SetPixelData.html below:

Unity - Scripting API: Cubemap.SetPixelData

Sets the raw data of an entire mipmap level of a face directly in CPU memory.

This method sets pixel data for the texture in CPU memory. Texture.isReadable must be true, and you must call Apply after SetPixelData to upload the changed pixels to the GPU.

SetPixelData is useful if you want to load compressed or other non-color texture format data into a texture.

The size of the data array must be the width × height of the mipmap level, and the data layout must match the texture format, otherwise SetPixelData fails. You can use byte for T if you don't want to define a custom struct to match the texture format.

Unity throws an exception when SetPixelData fails.

Additional resources: SetPixels, GetPixelData, Apply.

using UnityEngine;
public class ExampleScript : MonoBehaviour
{
    public void Start()
    {
        Cubemap cubemap = new Cubemap(2, TextureFormat.RGB24, true);
        var byteArray = new byte[] {255, 0, 0,
                                    0, 255, 0,
                                    0, 0, 255,
                                    255, 235, 4,
                                    255, 0, 255,
                                    255, 255, 255,
                                    0, 0, 0,
                                    0, 255, 255,
                                    255, 0, 255};
        cubemap.SetPixelData(byteArray, 0, CubemapFace.PositiveX);
        cubemap.SetPixelData(byteArray, 1, CubemapFace.PositiveX,  12);
        cubemap.SetPixelData(byteArray, 0, CubemapFace.NegativeX, 15);
        cubemap.SetPixelData(byteArray, 1, CubemapFace.NegativeX, 12);
        cubemap.SetPixelData(byteArray, 0, CubemapFace.PositiveY);
        cubemap.SetPixelData(byteArray, 1, CubemapFace.PositiveY,  12);
        cubemap.SetPixelData(byteArray, 0, CubemapFace.NegativeY, 15);
        cubemap.SetPixelData(byteArray, 1, CubemapFace.NegativeY, 12);
        cubemap.SetPixelData(byteArray, 0, CubemapFace.PositiveZ);
        cubemap.SetPixelData(byteArray, 1, CubemapFace.PositiveZ,  12);
        cubemap.SetPixelData(byteArray, 0, CubemapFace.NegativeZ, 15);
        cubemap.SetPixelData(byteArray, 1, CubemapFace.NegativeZ, 12);
        cubemap.Apply(updateMipmaps: false);
    }
}

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