mental ray vs elvish ray...


TEST 1:


mental ray:


eye rays:        397901
shadow rays:     343112
rendering time:  3.44s
rays per sec:    215410.75
shadow rays per eye ray: 0.86


elvish ray:


eye rays:        500673
shadow rays:     437933
rendering time:  4.36s
rays per sec:    215276.61
shadow rays per eye ray: 0.87


TEST 2:


mental ray:


eye rays:        397901
shadow rays:     343112
rendering time:  3.44s
rays per sec:    215410.75
shadow rays per eye ray: 0.86


elvish ray:


eye rays:        458146
shadow rays:     404233
rendering time:  2.77s
rays per sec:    311328.15
shadow rays per eye ray: 0.88




why mental ray can save many rays when the sampling options are the same?...

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