Normal map

From DmWiki

Normal Mapping is an application of the bump mapping technique. While bump mapping perturbs the existing normal of a model, normal mapping replaces the normal entirely. Like bump mapping, Normal Mapping is used to add detail to a model without using more polygons. But where a Bump Map is calculated based on a single channel (greyscale), normal mapping is a multichannel image (channels for Red, Green and Blue) derived from a set of more detailed versions of the model.

In computer games, this method is used to enhance the appearance of a low polygon model by using a normal map from a higher polygon model.

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Plan to have shader code here for an example for normal mapping in near future.

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