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Indigo is a new, free, actively developed, unbiased render engine.

Employing advanced features such as Metropolis Light Transport, Spectral light calculus,a virtual camera model, physical sky and more, Indigo can achieve much more realistic results than traditional GI raytracers.

Indigo does not need any render parameters like GI samples, AO samples, AA samples, Soft shadows, etc, and complicated lighting setups to achieve realistic results.

Indigo is free for non- and commercial use, but as of writing is not open-source.

Indigo是什么？简单来说它是一个渲染引擎。

Indigo使用反向或双向路径跟踪的MLT（Metropolis Light Transport）算法来替代传统的光线跟踪算法。

所有的光线照明能与物理模型（作为光谱数据）交互影响，Indigo拥有创作出照片级作品的所有条件，如：一个虚拟的摄影机模型、物理天空、体积光源等等。这些技术使得Indigo完全可以逼近NextLimit的Maxwell渲染器。

同时Indigo对于非商业用途是完全免费的，但它并不开源。