Indigo Renderer

Indigo Renderer is 3D rendering software developed by Glare Technologies. It uses unbiased rendering technologies to create photo-realistic images by simulating the behavior of light using equations. The software is capable of producing effects such as:

• Depth of field, as when a camera is focused on one object and the background is blurred
• Spectral effects, as when a beam of light goes through a prism and a rainbow of colours is produced
• Refraction, as when light enters a pool of water and the objects in the pool seem to be "bent"
• Reflections, from subtle reflections on a polished concrete floor to the pure reflection of a silvered mirror
• Caustics, as in light that has been focused through a magnifying glass and has made a pattern of brightness on a surface

Indigo Renderer

A photorealistic image rendered with Indigo
Developer(s)	Glare Technologies
Stable release	4.2 (December 6, 2019 (2019-12-06)) [±]
Operating system	Linux, macOS and Windows
Type	Rendering system
License	Proprietary commercial software
Website	indigorenderer.com

A render demonstrating Indigo's realistic light simulation

Indigo Renderer utilizes various methods including Metropolis light transport (MLT), spectral light calculus, and virtual camera model. Scene data can be stored in XML or IGS format.

The software features Monte-Carlo path tracing, bidirectional path tracing and MLT on top of bidirectional path tracing, distributed render capabilities, and progressive rendering (image gradually becomes less noisy as rendering progresses). It also supports subsurface scattering and has its own image format (.igi).

It was originally released as freeware but it became a commercial product with the 2.0 release. The Indigo 3 series introduced features such as real-time editing capabilities, while version 4 of the software adds pure GPU rendering through a vendor neutral OpenCL path tracing engine. [1][2]