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Luculentus
From the Latin ‘luculentus’, meaning ‘bright’, ‘shining’, ‘impressive’, ‘gorgeous’. Proof of concept spectral path tracer, released under the GNU General Public License.
Luculentus traces rays at different wavelengths, giving it the ability to simulate effects like dispersion and chromatic aberration. It was written with code clarity as the primary goal; it is not optimised for speed, although it is multithreaded.