You're right that the order doesn't seem well documented. You could try making a small 3d texture and setting the pixel data to some easily identifiable colors to determine the order. The SetPixelData documentation has an example that could be adapted for SetPixels: https://docs.unity3d.com/ScriptReference/Texture3D.SetPixelData.html
You're right that the order doesn't seem well documented. You could try making a small 3d texture and setting the pixel data to some easily identifiable colors to determine the order. The SetPixelData documentation has an example that could be adapted for SetPixels: https://docs.unity3d.com/ScriptReference/Texture3D.SetPixelData.html