POV-Ray

<h2 id="history">History</h2>

Sometime in the 1980s, David Kirk Buck downloaded the <a href="/facts/Source_code/o9J6Jv23">source code</a> for a <a href="/facts/Unix/0pNL2seI">Unix</a> ray tracer to his <a href="/facts/Amiga/60B3A9of">Amiga</a>. He experimented with it for a while and eventually decided to write his own ray tracer named DKBTrace after his initials. He posted it to the "You Can Call Me Ray" <a href="/facts/Bulletin_board_system/22d9c9s2">bulletin board system</a> (BBS) in Chicago, thinking others might be interested in it. In 1987, Aaron A. Collins downloaded DKBTrace and began working on an <a href="/facts/X86/Kypq5fgu">x86</a> port of it. He and David Buck collaborated to add several more features. POV also had/has similarities with (and borrows from) Rayshade, another BBS era raytracer, including the short but good <a href="/facts/Rayshade/hpT2HVfX">Rayshade</a> book.
When the program proved to be more popular than anticipated, they could not keep up with demand for more features. Thus, in July 1991, David turned over the project to a team of programmers working in the "GraphDev" <a href="/facts/Online_forum/bRuqfQfN">forum</a> on <a href="/facts/CompuServe/Pjpdcf2a">CompuServe</a>. At the same time, David felt that it was inappropriate to use his initials on a program he no longer maintained. The name "STAR-Light" (Software Taskforce on Animation and Rendering) was initially used, but eventually the name became "PV-Ray", and then ultimately "POV-Ray" (Persistence of Vision Ray Tracer),<a class="footnote-ref" id="fnref:2" href="#fn:2">2</a> a name inspired by <a href="/facts/Salvador_Dal%25C3%25AD/zSQQwTkm">Dalí</a>'s painting, <a href="/facts/The_Persistence_of_Memory/CJD3Tzdt">The Persistence of Memory</a>.<a class="footnote-ref" id="fnref:3" href="#fn:3">3</a><a class="footnote-ref" id="fnref:4" href="#fn:4">4</a>
Features of the application, and a summary of its history, are discussed in a February 2008 interview with David Kirk Buck and Chris Cason on episode 24 of <a href="/facts/FLOSS_Weekly/z5LB4IWD">FLOSS Weekly</a>.<a class="footnote-ref" id="fnref:5" href="#fn:5">5</a>

<h2 id="features">Features</h2>

POV-Ray has matured substantially since it was created. Recent versions of the software include the following features:

<ul><li>a <a href="/facts/Turing-completeness/73goop44">Turing-complete</a> scene description language (SDL) that supports macros and loops<a class="footnote-ref" id="fnref:6" href="#fn:6">6</a></li>
<li>a library of ready-made scenes, textures, and objects</li>
<li>support for a number of <a href="/facts/Geometric_primitive/FmpXkhao">geometric primitives</a> and <a href="/facts/Constructive_solid_geometry/Dcs2fzyU">constructive solid geometry</a></li>
<li>several kinds of <a href="/facts/Light_source/jeofpMn4">light sources</a></li>
<li>atmospheric effects such as <a href="/facts/Fog/mrIdyIc7">fog</a> and media (<a href="/facts/Smoke/KRJaumoC">smoke</a>, <a href="/facts/Clouds/KDgo0Wqu">clouds</a>)</li>
<li><a href="/facts/Reflection_(physics)/BhcjDs79">reflections</a>, <a href="/facts/Refraction/S8kvSKzM">refractions</a>, and light <a href="/facts/Caustic_(optics)/og01czyx">caustics</a> using <a href="/facts/Photon_mapping/t58p6V7w">photon mapping</a></li>
<li>surface patterns such as <a href="/facts/Wrinkle/qhLS2Lgb">wrinkles</a>, bumps, and <a href="/facts/Capillary_wave/KnCg8GAg">ripples</a>, for use in <a href="/facts/Procedural_texture/6mNLlWN3">procedural textures</a> and <a href="/facts/Bump_mapping/c97rLmK6">bump mapping</a></li>
<li><a href="/facts/Radiosity_(computer_graphics)/qN75qQgV">radiosity</a></li>
<li>support for <a href="/facts/Texture_(computer_graphics)/9gDTsuXN">textures</a> and rendered output in many image formats, including <a href="/facts/Truevision_Targa_file_format/rQc1hHS4">TGA</a>, <a href="/facts/Portable_Network_Graphics/mwgK6xw5">PNG</a>, and <a href="/facts/JPEG/HQ8QS3uB">JPEG</a>, among others</li>
<li>extensive <a href="/facts/User_documentation/cSXDUPPg">user documentation</a></li>
<li>support for custom output resolutions<a class="footnote-ref" id="fnref:7" href="#fn:7">7</a> (This includes extreme resolutions such as <a href="/facts/16K_resolution/B6rLVN8j">16K</a>)</li>
<li>two types of <a href="/facts/Supersampling/15ysD7bJ">SSAA</a><a class="footnote-ref" id="fnref:8" href="#fn:8">8</a> Type 1 is an adaptive, non-recursive, super-sampling method. It is adaptive because not every pixel is super-sampled. Type 2 is an adaptive and recursive super-sampling method. It is recursive because the pixel is sub-divided and sub-sub-divided recursively. The adaptive nature of type 2 is the variable depth of recursion.<a class="footnote-ref" id="fnref:9" href="#fn:9">9</a></li></ul>
One of POV-Ray's main attractions is its large collection of third-party-made assets and tools. A large number of tools, textures, models, scenes, and tutorials can be found on the web. It is also a useful reference for those wanting to learn how <a href="/facts/Ray_tracing_(graphics)/n6qpap2q">ray tracing</a> and related 3D geometry and computer graphics algorithms work.

<h3>Current version</h3>
The current official version of POV-Ray is 3.7. This version introduces:

<ul><li>support for <a href="/facts/Symmetric_multiprocessing/T9CahUsN">symmetric multiprocessing</a> (SMP), to allow the renderer to take advantage of <a href="/facts/Multiprocessing/aDCfehDQ">multiple processors</a></li>
<li>support for <a href="/facts/High-dynamic-range_imaging/bC6NAbGS">high-dynamic-range imaging</a> (HDRI), including the <a href="/facts/OpenEXR/Qrr9TgYb">OpenEXR</a> and <a href="/facts/Radiance_(software)/RkrnwR34">radiance</a> file formats</li>
<li>improved <a href="/facts/Bounding_volume/2okceuxx">bounding</a> using <a href="/facts/Binary_space_partitioning/sn9MhTSB">BSP</a> trees</li></ul>
Some of the main introduced features of the previous release (3.6) are:

<ul><li>extending <a href="/facts/UV_mapping/lzS1855A">UV mapping</a> to more primitives</li>
<li>adding 16- and 32-bit integer data to a density file</li>
<li>improving <a href="/facts/64-bit_computing/AgvkQHkM">64-bit</a> <a href="/facts/Computer_compatibility/PNAF7EAB">compatibility</a></li></ul>
In July 2006, <a href="/facts/Intel_Corporation/SMF0gJJX">Intel Corporation</a> started using the <a href="/facts/Beta_version/z4Q4RElA">beta version</a> of 3.7 to demonstrate their new <a href="/facts/Dual-core/ABNb65hQ">dual-core</a> <a href="/facts/Conroe_(microprocessor)/LFd3CrWg">Conroe processor</a> due to the efficiency of the SMP (symmetric multiprocessing) implementation.

<h3>Primitives</h3>

POV-Ray, in addition to standard <a href="/facts/3d_geometry/tHH3JFoq">3D geometric</a> shapes like <a href="/facts/Torus/J9SkaV1W">tori</a>, <a href="/facts/Sphere/jywYLNM2">spheres</a>, and <a href="/facts/Heightfield/EwXCqTY7">heightfields</a>, supports mathematically defined <a href="/facts/Primitives_(computer_graphics)/FmpXkhao">primitives</a> such as the <a href="/facts/Isosurface/kvMHSemB">isosurface</a> (a finite approximation of an arbitrary function), the <a href="/facts/Polynomial/Lzak8VVx">polynomial</a> primitive (an <a href="/facts/Infinity/cF506uD7">infinite</a> object defined by a <a href="/facts/Degree_of_a_polynomial/Bf8vEIhf">15th order or lower polynomial</a>), the <a href="/facts/Julia_set/dmn8xIcG">julia fractal</a> (a 3-dimensional slice of a <a href="/facts/Four-dimensional_space/vFQd0M7T">4-dimensional</a> fractal), the <a href="/facts/Superellipse/W30jhjo5">superquadratic ellipsoid</a> (an intermediate between a sphere and a cube), and the <a href="/facts/Parametric_feature_based_modeler/12J69aud">parametric</a> primitive (using equations that represent its surface, rather than its interior).
POV-Ray internally represents objects using their mathematical definitions; all POV-Ray primitive objects can be described by <a href="/facts/Mathematical_functions/CdReEKCh">mathematical functions</a>. This is different from many computer programs that include 3D models, which typically use <a href="/facts/Triangle/cRXUwsMn">triangle</a> <a href="/facts/Polygon_mesh/6WLD80ER">meshes</a> to compose all the objects in a scene.
This fact provides POV-Ray with several advantages and disadvantages over other rendering and modeling systems; POV-Ray primitives are more accurate than their polygonal counterparts: objects that can be described in terms of spheres, planar surfaces, cylinders, tori, and the like, are perfectly smooth and mathematically accurate in POV-Ray renderings, whereas polygonal artifacts may be visible in mesh-based modeling software. POV-Ray primitives are also simpler to define than most of their polygonal counterparts, e.g., in POV-Ray, a <a href="/facts/Sphere/jywYLNM2">sphere</a> is described simply by its center and radius; in a mesh-based environment, a sphere must be described by a multitude of small connected polygons (usually <a href="/facts/UV_sphere/lzS1855A">quads</a> or <a href="/facts/Icosphere/AaaKjYB9">triangles</a>).
On the other hand, script-based primitive modeling is not always a practical method to create certain objects, such as realistic characters or complex man-made artifacts like cars. Those objects can be created first in mesh-based modeling applications such as <a href="/facts/Wings_3D/MrWsU2vU">Wings 3D</a> and <a href="/facts/Blender_(software)/yzuvB0fL">Blender</a>, and then they can be converted to POV-Ray's own mesh format.

<h3>Examples of the scene description language</h3>
The following is an example of the scene description language used by POV-Ray to describe a scene to render. It demonstrates the use of a background colour, camera, lights, a simple box shape having a surface normal and finish, and the transforming effects of rotation.

#version 3.6;
// Includes a separate file defining a number of common colours
 #include "colors.inc"
 global_settings { assumed_gamma 1.0 }

// Sets a background colour for the image (dark grey)
 background { color rgb <0.25, 0.25, 0.25> }

// Places a camera
// direction: Sets, among other things, the field of view of the camera
// right: Sets the aspect ratio of the image
// look_at: Tells the camera where to look
 camera { location <0.0, 0.5, -4.0>
 direction 1.5*z
 right x*image_width/image_height
 look_at <0.0, 0.0, 0.0> }

// Places a light source
// color: Sets the color of the light source (white)
// translate: Moves the light source to a desired location
 light_source { <0, 0, 0>
 color rgb <1, 1, 1>
 translate <-5, 5, -5> }
// Places another light source
// color: Sets the color of the light source (dark grey)
// translate: Moves the light source to a desired location
 light_source { <0, 0, 0>
 color rgb <0.25, 0.25, 0.25>
 translate <6, -6, -6> }

// Sets a box
// pigment: Sets a color for the box ("Red" as defined in "colors.inc")
// finish: Sets how the surface of the box reflects light
// normal: Sets a bumpiness for the box using the "agate" in-built model
// rotate: Rotates the box
 box { <-0.5, -0.5, -0.5>,
 <0.5, 0.5, 0.5>
 texture { pigment { color Red }
 finish { specular 0.6 }
 normal { agate 0.25 scale 1/2 }
 }
 rotate <45,46,47> }

The following script fragment shows the use of variable declaration, assignment, comparison and the while loop construct:

#declare the_angle = 0;

#while (the_angle < 360)
 	box { <-0.5, -0.5, -0.5>
 		<0.5, 0.5, 0.5>
 texture { pigment { color Red }
 finish { specular 0.6 }
 normal { agate 0.25 scale 1/2 } }
 		rotate the_angle }
 	#declare the_angle = the_angle + 45;
 #end

<h2 id="modeling">Modeling</h2>
The POV-Ray program itself does not include a <a href="/facts/3D_modeling/6V3Ry9AJ">modeling</a> feature; it is essentially a pure renderer with a sophisticated model description language. To accompany this feature set, third parties have developed a large variety of modeling software, some specialized for POV-Ray, others supporting import and export of its data structures, including the free and open-source 3D creation suite <a href="/facts/Blender_(software)/yzuvB0fL">Blender</a>.<a class="footnote-ref" id="fnref:10" href="#fn:10">10</a>
A number of additional POV-Ray compatible modelers are linked from <a href="http://www.povray.org/resources/links/3D_Programs/Modelling_Programs/">Povray.org: Modelling Programs</a>.
In 2007, POV-Ray acquired the rights to <a href="http://www.stmuc.com/moray/medown.html">Moray</a> <a href="https://web.archive.org/web/20200428230409/http://www.stmuc.com/moray/medown.html">Archived</a> 2020-04-28 at the <a href="/facts/Wayback_Machine/nmQ3a6JC">Wayback Machine</a>,<a class="footnote-ref" id="fnref:11" href="#fn:11">11</a> an interactive 3-D modeling program long used with POV-Ray. However, as of December 2016, Moray development is stalled.<a class="footnote-ref" id="fnref:12" href="#fn:12">12</a>

<h2 id="software">Software</h2>
<h3>Development and maintenance</h3>
Official modifications to the POV-Ray source tree are done and/or approved by the POV-Team. Most patch submission and/or bug reporting is done in the POV-Ray newsgroups on the <a href="nntp://news.povray.org/">news.povray.org</a> <a href="/facts/Usenet/lYJWFBR6">news</a> server (with a <a href="/facts/Web_interface/e9sPEWVD">Web interface</a> <a href="http://news.povray.org/groups/">also available</a>). Since POV-Ray's source is available there are unofficial <a href="/facts/Fork_(software)/D6khxhpr">forks</a> and patched versions of POV-Ray available from third parties; however, these are not officially supported by the POV-Team.
Official POV-Ray versions currently do not support <a href="/facts/Shader/qfhkKFwA">shader</a> plug-ins.<a class="footnote-ref" id="fnref:13" href="#fn:13">13</a> Some features, like <a href="/facts/Radiosity_(computer_graphics)/qN75qQgV">radiosity</a> and <a href="/facts/Spline_(mathematics)/yafkQtqp">splines</a> are still in development and may be subject to syntactical change.

<h3>Platform support</h3>
POV-Ray 3.6 is distributed in compiled format for <a href="/facts/Mac_(computer)/8GhnXTK0">Mac</a>, <a href="/facts/Microsoft_Windows/bwhAhuSL">Windows</a> and <a href="/facts/Linux/9FvCKSTq">Linux</a>.
Support for <a href="/facts/Apple%25E2%2580%2593Intel_architecture/1GpN0gWz">Intel Macs</a> is not available in the <a href="/facts/Mac_(computer)/8GhnXTK0">Mac</a> version, but since <a href="/facts/Mac_OS_X/Y93vVpTm">Mac OS X</a> is a version of <a href="/facts/Unix/0pNL2seI">Unix</a> the Linux version can be <a href="/facts/Compiler/WNfCDFJe">compiled</a> on it.
The 3.7 versions with <a href="/facts/Symmetric_multiprocessing/T9CahUsN">SMP</a> support are officially supported for Windows and Linux. Unofficial <a href="/facts/Mac_(computer)/8GhnXTK0">Mac</a> versions for v3.7 can be found.<a class="footnote-ref" id="fnref:14" href="#fn:14">14</a>
POV-Ray can be <a href="/facts/Source_port/6z2qbY4I">ported</a> to any platform which has a compatible <a href="/facts/C%252B%252B/Et0F2qn9">C++</a> compiler.

<h3>Licensing</h3>
Originally, POV-Ray was distributed under its own POV-Ray License; namely, the POV-Ray 3.6 Distribution License<a class="footnote-ref" id="fnref:15" href="#fn:15">15</a> and the POV-Ray 3.6 Source License,<a class="footnote-ref" id="fnref:16" href="#fn:16">16</a> which permitted free distribution of the program source code and binaries, while restricting commercial distribution and the creation of derivative works other than fully functional versions of POV-Ray.
Although the <a href="/facts/Source_code/o9J6Jv23">source code</a> of older versions is available for modification, due to the above 3.6 and prior license restrictions, it was not <a href="/facts/Open-source_software/HzTaB8E9">open source</a> or <a href="/facts/Free_software/IaoVtJXn">free software</a> according to the <a href="/facts/Open_Source_Initiative/sJtjc2EF">OSI</a> or the <a href="/facts/Free_Software_Foundation/k0sBmw7y">FSF</a> definition of the term. This was a problem as <a href="/facts/Source_code/o9J6Jv23">source code</a> exchange with the greater <a href="/facts/Free_and_open-source_software/1cHtjLCB">FOSS</a> ecosystem was impossible due to <a href="/facts/License_incompatibility/sMCXI8sI">license incompatibility</a> with <a href="/facts/Copyleft_license/DHjTyl7C">copyleft licenses</a>.
One of the reasons that POV-Ray was not originally licensed under the free software <a href="/facts/GNU_General_Public_License/S75KhLSX">GNU General Public License</a> (GPL), or other open source licenses, is that POV-Ray was developed before the GPL-style licenses became widely used; the developers wrote their own license for the release of POV-Ray, and contributors to the software worked under the assumption their contributions would be licensed under the POV-Ray 3.6 Licenses.
In 2013, with version 3.7, POV-Ray was relicensed under the <a href="/facts/GNU_Affero_General_Public_License/n1h9A893">GNU Affero General Public License</a> version 3 (or later).<a class="footnote-ref" id="fnref:17" href="#fn:17">17</a> Thus POV-Ray is since then <a href="/facts/Free_software/IaoVtJXn">free software</a> according to the <a href="/facts/Free_Software_Foundation/k0sBmw7y">FSF</a> definition and also <a href="/facts/Open_source_software/HzTaB8E9">open source software</a> according to the <a href="/facts/Open_Source_Definition/cRszXMSN">Open Source Definition</a>.

<h2 id="see-also">See also</h2>
<ul>
<li>Amiga portal</li><li>Free and open-source software portal</li></ul>

Wikimedia Commons has media related to POV-Ray.

<ul><li><a href="/facts/Blender_(software)/yzuvB0fL">Blender</a> – a free and open-source software program for 3D modeling, animation, and rendering</li>
<li><a href="/facts/Kerkythea/nVBG2VjJ">Kerkythea</a> – a freeware ray-tracing program with enhanced <a href="/facts/Sketchup/jNSyQW7z">Sketchup</a> compatibility</li>
<li><a href="/facts/Sunflow/vEImxzTG">Sunflow</a> – an open-source rendering system for photo-realistic image synthesis, written in Java</li></ul>

<h2 id="external-links">External links</h2>

Wikimedia Commons has media related to POV-Ray.

<ul><li><a href="http://www.povray.org">Official website</a></li></ul>

<h2 id="references">References</h2>

<ol>
<li id="fn:1">"Polyray v1.7". Alexander R. Enzmann. Retrieved 2016-07-05. <a href="http://paulbourke.net/dataformats/polyray/" target="_blank">http://paulbourke.net/dataformats/polyray/</a> <a href="#fnref:1" class="footnote-back-ref">↩</a></li>
<li id="fn:2">"POV-Ray: News". povray.org. Retrieved 2018-12-19. <a href="http://www.povray.org/news/index.php#323" target="_blank">http://www.povray.org/news/index.php#323</a> <a href="#fnref:2" class="footnote-back-ref">↩</a></li>
<li id="fn:3">"Documentation: 1.1.5 The Early History of". POV-Ray. Retrieved 2014-05-05. <a href="http://www.povray.org/documentation/view/3.6.0/7/" target="_blank">http://www.povray.org/documentation/view/3.6.0/7/</a> <a href="#fnref:3" class="footnote-back-ref">↩</a></li>
<li id="fn:4">"The TWiT Netcast Network with Leo Laporte". Twit.tv. 2008-02-07. Retrieved 2014-05-05. <a href="http://twit.tv/floss24" target="_blank">http://twit.tv/floss24</a> <a href="#fnref:4" class="footnote-back-ref">↩</a></li>
<li id="fn:5">"The TWiT Netcast Network with Leo Laporte". Twit.tv. 2008-02-07. Retrieved 2014-05-05. <a href="http://twit.tv/floss24" target="_blank">http://twit.tv/floss24</a> <a href="#fnref:5" class="footnote-back-ref">↩</a></li>
<li id="fn:6">Paul Bourke: Supershape in 3D are examples of POV-Ray images made with very short code <a href="http://paulbourke.net/geometry/supershape/" target="_blank">http://paulbourke.net/geometry/supershape/</a> <a href="#fnref:6" class="footnote-back-ref">↩</a></li>
<li id="fn:7">"POV-Ray: Documentation: 2.1.2.2 General Output Options". www.povray.org. Retrieved 2023-09-08. <a href="https://www.povray.org/documentation/view/3.6.0/217/" target="_blank">https://www.povray.org/documentation/view/3.6.0/217/</a> <a href="#fnref:7" class="footnote-back-ref">↩</a></li>
<li id="fn:8">"POV-Ray: Documentation: 2.1.2.8 Tracing Options". www.povray.org. Retrieved 2023-09-08. <a href="http://www.povray.org/documentation/view/3.6.2/223/" target="_blank">http://www.povray.org/documentation/view/3.6.2/223/</a> <a href="#fnref:8" class="footnote-back-ref">↩</a></li>
<li id="fn:9">"POV-Ray: Documentation: 2.1.2.8 Tracing Options". www.povray.org. Retrieved 2023-09-08. <a href="http://www.povray.org/documentation/view/3.6.2/223/" target="_blank">http://www.povray.org/documentation/view/3.6.2/223/</a> <a href="#fnref:9" class="footnote-back-ref">↩</a></li>
<li id="fn:10">Blender <a href="https://en.blender.org/index.php/Extensions:2.6/Py/Scripts/Render/POV-Ray" target="_blank">https://en.blender.org/index.php/Extensions:2.6/Py/Scripts/Render/POV-Ray</a> <a href="#fnref:10" class="footnote-back-ref">↩</a></li>
<li id="fn:11">"News: Moray Announcement". POV-Ray. 2007-02-01. Retrieved 2014-05-05. <a href="http://www.povray.org/news/moray-announcement.php" target="_blank">http://www.povray.org/news/moray-announcement.php</a> <a href="#fnref:11" class="footnote-back-ref">↩</a></li>
<li id="fn:12">"POV-Ray/povray: The persistence of Vision Raytracer". POV-Ray. 2013-09-06. Retrieved 2022-08-05. <a href="https://github.com/POV-Ray/povray#3d-modeller" target="_blank">https://github.com/POV-Ray/povray#3d-modeller</a> <a href="#fnref:12" class="footnote-back-ref">↩</a></li>
<li id="fn:13">for such an implementation, see e.g., http://www.aetec.ee/fv/vkhomep.nsf/pages/povman2 Archived 2007-02-07 at the Wayback Machine <a href="http://www.aetec.ee/fv/vkhomep.nsf/pages/povman2" target="_blank">http://www.aetec.ee/fv/vkhomep.nsf/pages/povman2</a> <a href="#fnref:13" class="footnote-back-ref">↩</a></li>
<li id="fn:14">povrayunofficial_mac on megapov.inetart.net <a href="http://megapov.inetart.net/povrayunofficial_mac/index.html" target="_blank">http://megapov.inetart.net/povrayunofficial_mac/index.html</a> <a href="#fnref:14" class="footnote-back-ref">↩</a></li>
<li id="fn:15">"POV-Ray 3.6 Distribution License". povray.org. Retrieved 2016-12-12. <a href="http://www.povray.org/distribution-license-3.6.html" target="_blank">http://www.povray.org/distribution-license-3.6.html</a> <a href="#fnref:15" class="footnote-back-ref">↩</a></li>
<li id="fn:16">"POV-Ray 3.6 Source License". povray.org. Retrieved 2016-12-12. <a href="http://www.povray.org/source-license-3.6.html" target="_blank">http://www.povray.org/source-license-3.6.html</a> <a href="#fnref:16" class="footnote-back-ref">↩</a></li>
<li id="fn:17">Cason, Chris (8 November 2013). "Download POV-Ray 3.7.0". Retrieved 11 November 2013. Starting with version 3.7, POV-Ray is released under the AGPL3 (or later) license and thus is Free Software according to the FSF definition. [...] Full source code is available, allowing users to build their own versions and for developers to incorporate portions or all of the POV-Ray source into their own software provided it is distributed under a compatible license (for example, the AGPL3 or – at their option – any later version). <a href="http://www.povray.org/download/" target="_blank">http://www.povray.org/download/</a> <a href="#fnref:17" class="footnote-back-ref">↩</a></li>
</ol>

POV-Ray open-in-new

POV-Ray