YafaRay (formerly YafRay) is a

free and open-source Free and open-source software (FOSS) is a term used to refer to groups of software consisting of both free software and open-source software where anyone is freely licensed to use, copy, study, and change the software in any way, and the source ...

ray tracing program that uses an

XML Extensible Markup Language (XML) is a markup language and file format for storing, transmitting, and reconstructing arbitrary data. It defines a set of rules for encoding documents in a format that is both human-readable and machine-readable. T ...

scene description language A scene description language is any description language used to describe a scene to a 3D renderer, such as a ray tracer. The scene is written in a text editor (which may include syntax highlighting), as opposed to being modeled in a graphical ...

. There is a YafaRay addon for Blender 2.78. The ray tracer is licensed under the GNU Lesser General Public License (LGPL).

History

YafaRay's predecessor, YafRay ("Yet Another Free Raytracer"), was written by Alejandro Conty Estévez, and was first released in July 2002. The last version of that program was 0.0.9, which was released in 2006. Due to limitations of the original software design, the YafRay

raytracer In 3D computer graphics, ray tracing is a technique for modeling light transport for use in a wide variety of rendering algorithms for generating digital images. On a spectrum of computational cost and visual fidelity, ray tracing-based rend ...

was completely rewritten by Mathias Wein. The first stable version of the new raytracer, given the name ''YafaRay'' 0.1.0, was released in October 2008. The latest stable version is 3.4.1 released in 2020.

Features

Rendering

;Global illumination :YafaRay employs

global illumination Global illumination (GI), or indirect illumination, is a group of algorithms used in 3D computer graphics that are meant to add more realistic lighting to 3D scenes. Such algorithms take into account not only the light that comes directly from ...

using Montecarlo-derived approximations to produce realistically lit renders of 3D scenes. ;Skydome illumination :The illumination system is based mainly on light coming from an emitting sky (see skybox), taking into account soft-shadow calculations involved. The illumination can be obtained from a high-dynamic-range image (HDRI). ;Caustics :YafaRay uses a form of

photon mapping In computer graphics, photon mapping is a two-pass global illumination rendering algorithm developed by Henrik Wann Jensen between 1995 and 2001Jensen, H. (1996). ''Global Illumination using Photon Maps''. nlineAvailable at: http://graphics.stanf ...

that allows for caustics (light distortion produced by reflection or refraction of a curved surface, such as through a

burning glass A burning glass or burning lens is a large convex lens that can concentrate the sun's rays onto a small area, heating up the area and thus resulting in ignition of the exposed surface. Burning mirrors achieve a similar effect by using reflecting s ...

). For simulating somewhat

translucent In the field of optics, transparency (also called pellucidity or diaphaneity) is the physical property of allowing light to pass through the material without appreciable scattering of light. On a macroscopic scale (one in which the dimensions a ...

materials, there is a subsurface scattering shader under development. ;Depth of field :

Depth of field The depth of field (DOF) is the distance between the nearest and the furthest objects that are in acceptably sharp focus in an image captured with a camera. Factors affecting depth of field For cameras that can only focus on one object dist ...

effects can be produced by using settings for

focal distance The focal length of an optical system is a measure of how strongly the system converges or diverges light; it is the inverse of the system's optical power. A positive focal length indicates that a system converges light, while a negative foca ...

and

aperture In optics, an aperture is a hole or an opening through which light travels. More specifically, the aperture and focal length of an optical system determine the cone angle of a bundle of rays that come to a focus in the image plane. An opt ...

. With a fixed point in the scene in focus, objects closer and farther away will be out of focus. ;Blurry reflections :If the material of a surface is not a perfect

reflector Reflector may refer to: Science * Reflector, a device that causes reflection (for example, a mirror or a retroreflector) * Reflector (photography), used to control lighting contrast * Reflecting telescope * Reflector (antenna), the part of an ant ...

, '' distortion'' arises in the reflected light. This distortion will grow bigger as the reflecting object is taken farther away. YafaRay can simulate this phenomenon of blurry reflections.

Architecture

;Modular framework :YafaRay features a modular structure: at the core is a kernel the rest of the render elements (scene loader, lights, and shaders) must connect to. This, together with the specification of an

API An application programming interface (API) is a way for two or more computer programs to communicate with each other. It is a type of software Interface (computing), interface, offering a service to other pieces of software. A document or standa ...

, allows for the development of rendering plug-ins to enable the use of YafaRay from any program or 3D suite. YafaRay-supported software includes: Blender, Wings 3D, and

Aztec The Aztecs () were a Mesoamerican culture that flourished in central Mexico in the post-classic period from 1300 to 1521. The Aztec people included different Indigenous peoples of Mexico, ethnic groups of central Mexico, particularly those g ...

. ;Cross-platform :YafaRay was written in C++ for good portability, and there are precompiled

binaries A binary file is a computer file that is not a text file. The term "binary file" is often used as a term meaning "non-text file". Many binary file formats contain parts that can be interpreted as text; for example, some computer document file ...

for the most common platforms:

Linux Linux ( or ) is a family of open-source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991, by Linus Torvalds. Linux is typically packaged as a Linux distribution, which ...

Windows Windows is a group of several proprietary graphical operating system families developed and marketed by Microsoft. Each family caters to a certain sector of the computing industry. For example, Windows NT for consumers, Windows Server for serv ...

and

Mac OS X macOS (; previously OS X and originally Mac OS X) is a Unix operating system developed and marketed by Apple Inc. since 2001. It is the primary operating system for Apple's Mac (computer), Mac computers. Within the market of ...

. YafaRay can be used as a stand-alone

render engine Rendering or image synthesis is the process of generating a photorealistic or non-photorealistic image from a 2D or 3D model by means of a computer program. The resulting image is referred to as the render. Multiple models can be defined ...

, using its own scene description format. In this way, it can be used directly from the command line, it can be called by a

script Script may refer to: Writing systems * Script, a distinctive writing system, based on a repertoire of specific elements or symbols, or that repertoire * Script (styles of handwriting) ** Script typeface, a typeface with characteristics of handw ...

, etc. There are also provisions for

parallel Parallel is a geometric term of location which may refer to: Computing * Parallel algorithm * Parallel computing * Parallel metaheuristic * Parallel (software), a UNIX utility for running programs in parallel * Parallel Sysplex, a cluster of IBM ...

and/or distributed rendering.

External links

*
Source code

Material Library

Material Search
{{Software in the Public Interest 3D rendering software for Linux Free 3D graphics software Free software programmed in C++ Global illumination software Rendering systems

History

Features

Rendering

Architecture

See also

External links