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You create a Cube Map to represent your environment; Sphere Maps are also possible, but often look distorted. Basically you give the environment map a set of images showing a "`360°`" view of the background scene – very similar to a skybox. The renderer maps the environment on the texture of the reflective surface, which results in an acceptable "`glass/mirror/water`" effect. Just like a skybox, the reflection map is static, so dynamic things (such as the player walking) are not part of the reflection. (!)
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mitm001