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Environment Map contrubution calculation

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once I have my environment map color, what''s the proper method for mixing this in the lighting equation. The two methods I tried are: adding it to the output color like: Kr * environment + therestofthelighting and the other methode lerps it with the diffuse like: diffuse = lerp(diffuse, environment, Kr); ...calcrestoflighting... Neither of these looked quite right, so I was wondering what equation everyone else uses for reflection/environment mapping.

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