Shadow projections from multilight sources in computer-generated 3-D scences are performed in the new transformed space called stereo space with reduced computation. The new transformation has particular applications to raster-scan shading algorithms.
15th Design Automation Conference, DAC 1978
Azrieli School of Architecture and Urbanism

Andonian, K.S, & Toida, S. (S.). (1978). Multisource illumination and shadowing. In Proceedings - Design Automation Conference (pp. 158–163). doi:10.1109/DAC.1978.1585163