Shadow Algorithms Data Miner

136 4. Soft Shadows

Another class of back-projection techniques have been applied to radiosity

[560,141,561,142,368,101,32]inordertondanoptimaldiscontinuitymesh(see

Section 5.10.1 for details).

4.7.3 Single-Ray Analytic Solution

Parker et al. [452] apply ray tracing to generate approximate but pleasant-looking

so shadows by shooting only one shadow ray per spherical light. e basic idea

is to identify the silhouette of objects and make semitransparent a region around

the silhouette. ese semitransparent regions therefore produce penumbrae. Any

penumbra region outside the umbra results in some interpolation from the umbra

to achieve so shadows, i.e., ...