No idea.. The gradients are useful on creating skyboxes.. they helped a alot with my new textures for skyboxes
Off topic: The picture looks fullbright just use some adequaded light_enviroment options also add shadow_control and it will make it Perfect like a Evening
It would be useful to add some kind of edges to the window. So add on a layer of a darker yellow, add some filth/noise and use a circular transparency gradient. Viola!
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