Mental Ray (stylized as mental ray) is a production-quality ray tracing application for 3D rendering. Its Berlin-based developer Mental Images was acquired by Nvidia in 2007 and Mental Ray was discontinued in 2017.
In November 2017 Nvidia announced that it would no longer offer new Mental Ray subscriptions, although maintenance releases with bug fixes were published throughout 2018 for existing plugin customers.[4]
Mental Ray was designed to be integrated into a third-party application using an API or be used as a standalone program using the .mi scene file format for batch-mode rendering. There were many programs integrating it such as Maya, 3D Studio Max, Cinema 4D, Revit, Softimage XSI, Houdini, SolidWorks and CATIA. Most of these software front-ends provided their own library of custom shaders (described below). However assuming these shaders are available to mental ray, any .mi file can be rendered, regardless of the software that generated it.
Mental Ray is fully programmable and infinitely variable, supporting linked subroutines also called shaders written in C or C++. This feature can be used to create geometric elements at runtime of the renderer, procedural textures, bump and displacement maps, atmosphere and volume effects, environments, camera lenses, and light sources.
An image of diamond rendered using Mental Ray in CATIA V5R19 Photo Studio
Supported geometric primitives include polygons, subdivision surfaces, and trimmed free-form surfaces such as NURBS, Bézier, and Taylor monomial.
Phenomena consist of one or more shader trees (DAG). A phenomenon looks like regular shader to the user, and in fact may be a regular shader, but generally it will contain a link to a shader DAG, which may include the introduction or modification of geometry, introduction of lenses, environments, and compile options. The idea of a Phenomenon is to package elements and hide complexity.
Since 2010 Mental Ray has also included the iray rendering engine,[5] which added GPU acceleration to the product. In 2013, the ambient occlusion pass was also accelerated by CUDA, and in 2015 the GI Next engine was added which can be used to compute all indirect/global illumination on GPUs.
In 2003, Mental Images received an Academy Award for contributions of mental ray to motion pictures.
See also
Dielectric Shader, able to realistically render the behavior of light rays passing through materials with differing refractive indices.
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This is a glossary of terms relating to computer graphics.
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