# 3Delight

3Delight is a 3D computer graphics software that runs on Microsoft Windows, macOS (both Intel and Apple Silicon) and Linux (both x86 and Graviton). Developed by Illumination Research, it is both a photorealistic and NPR path tracing offline renderer based on its NSI API scene description and on Open_Shading_Language for shading. It comes with supported, open source plug-in integrations for several DCC applications, such as Autodesk Maya, Houdini, Cinema4D, Katana, OpenUSD Hydra, and a democratic free license that allows for commercial use. It also provides a fully distributed cloud rendering service called 3Delight Cloud.

## History

Work on 3Delight started in 1999. The renderer became first publicly available in 2000. 3Delight was the first RenderMan-compliant renderer combining the REYES algorithm with on-demand ray tracing.
In March 2005, the license was changed. The first license was free and subsequent licenses cost 1,000 USD per two thread node and US$1,500 per four thread node. The first company that licensed 3Delight commercially was Rising Sun Pictures in early 2005.
Since 2018, all purchased licenses of 3Delight$^{NSI}$ are unlimited multi-core and the pricing was reduced to US$360 per year subscription or US$720 permanent with two year support. The first license is still free; initially limited to four cores/thread, later increased to eight and currently twelve.
As of 2018, Illumination Research, due to the aging of the Renderman Interface (RI), introduced the Nodal Scene Interface (NSI) that replaces the old Renderman one. To reflect such a change the name of the renderer has also been updated to 3Delight$^{NSI}$. Consequently the new 3Delight$^{NSI}$ renderer is not Renderman-compliant anymore.

## Specifications

Until version 10 (2013), 3Delight primarily used the REYES algorithm but was also capable of doing ray tracing and global illumination. As of version 11 (2014), 3Delight primarily used path tracing, with the option to use the REYES and RayTracing when needed. The 3Delight renderer was fully multi-threaded, supported RenderMan Shading Language (RSL) 1.0/2.0 with an optimized compiler and last stage JIT compilation. 3Delight supported distributed rendering. In 2018 3Delight$^{NSI}$ 1.0 was introduced as a forward path tracer based on the new NSI API and using OSL for all shaders and light emitters.
3Delight implements:
* Area light sources
* Depth of field
* Displacement mapping
* Environment mapping
* Global illumination
* Motion blur
* Programmable shading
* Camera projections
* Path tracing
* Spatial overrides
* Texture mapping
* Volume shading
* Hierarchical subdivision surfaces
Other specifications include:
* Extended display subset functionality
* Procedural geometry is instanced lazily.
* Displacement shaders can be stacked.
* Displacement shaders can (additionally) be run on the vertices of a geometric primitive, before that primitive is shaded.
* First order ray differentials on rays fired from within a shader.
* A read/write disk cache that allows for reduction of strain on the network.

## Supported platforms

* Apple macOS on both the x86-64 and Apple silicon architectures.
* Linux on the x86 and x86-64, architectures.
* Linux on the ARM64 architecture, on AWS Graviton.
* Microsoft Windows on the x86 and x86-64 architectures

### Operating environments

The renderer comes in 64-bit versions as well.

### Discontinued platforms

Platforms supported in the past included:
* Digital Equipment Corporation Digital UNIX on the Alpha architecture
* Silicon Graphics IRIX on the MIPS architecture (might still be supported, on request)
* Sun Microsystems Solaris on the SPARC architecture
* The Cell architecture
* Apple Mac OS X on the PowerPC (the last version to support PPC architecture was version 9).