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Penumbra is an important factor for three dimensional Computer Graphics in order to represent realistic images. However, it is not easy to generate penumbra in high speed because we must handle area light. Therefore, this paper proposes a new high speed algorithm that represents high resolution penumbra casted from psuedo area light by applying ray tracing that handles point light only. Our new algorithm is able to simulate penumbra of area light with practically sufficient quality. This algorithm is capable to generate penumbra at almost the same time as point light calculation and several tens of times faster than normal area light calculation.

ENHANCED RAY TRACING ALGORITHM TO GENERATE PENUMBRA BY POINT LIGHT