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I want to make realistic ice

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Variable index of refraction and specularity, fresnel weighted reflection/refraction factor, normal-mapped lookup to environment maps, per-pixel evaluation of diffuse, specular and scattered lighting...

Depends on how photorealistic you want it to be [smile]

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Looking into the various water-rendering algorithms/shaders (fresnel weighted reflection/refraction from Nik02's list) as they'll probably get you a very similar result. Just tweak the parameters accordingly to make it look more like ice [smile]

hth
Jack

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