Reply To: Listening room

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Jeremy HillJeremy Hill

Bump mapping has an associated cost, since you must evaluate more than one point to find the curve, but this cost is not related to the nature of the map, or really anything else. It will increase as the visible bumped surface area increases, as a percentage of all rays being computed (e.g. as you zoom in on a bumped surface).

So I guess if you are able to observe a measurable difference unrelated to that, it could be related to the lighting situation being altered by the bump; it seems possible that data will be forced out of cache more often than if you did not use bump, since bump will increase ray incoherence.