The problem seems to be the limitations inherent in the version of DirectX we're using. If you watch Halley, you'll see that she's orange, until a light hits her, and at that spot she'll turn yellow. That's an oversimplification of what an irridescent surface (like a goldfish's scales) does under varying lighting conditions... but it's the best we can do at the moment. I agree, though, shimmery, irridescent gold should be the very next improvement we attempt... as soon as we graduate to the latest DirectX!
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