This article presents the state of the art in the field. Most of this is yet to be implemented in commercial projects like games; VR and visualization applications. Code for the shader examples in this article is available under permissive open source licenses or as public domain software and is collected on the address:
Proceedings of SIGRAD 2013; Visual Computing; June 13-14; 2013; NorrkĂ¶ping; Sweden
 D. S. Ebert; F. K. Musgrave; D. Peachey; K. Perlin; and S. Worley. Texturing and Modeling: A Procedural Approach. Morgan Kaufmann Publishers Inc.; San Francisco; CA; USA; 3rd edition; 2002.
 A. R. Fernandes and B. Oliveira. Gpu tessellation: We still have a LOD of terrain to cover. In P. Cozzi and C. Riccio; editors; OpenGL Insights; pages 145â€“162. CRC Press; 2012.
 S. F. Frisken; R. N. Perry; A. P. Rockwood; and T. R. Jones. Adaptively sampled distance fields: a general representation of shape for computer graphics. In Proceedings of the 27th annual conference on Computer graphics and interactive techniques; SIGGRAPH â€™00; pages 249â€“254; New York; NY; USA; 2000. ACM Press/Addison-Wesley Publishing Co.
 C. Green. Improved alpha-tested magnification for vector textures and special effects. In ACM SIGGRAPH 2007 courses; SIGGRAPH â€™07; pages 9â€“18; New York; NY; USA; 2007. ACM.
 S. Gustavson. 2D shape rendering by distance fields. In P. Cozzi and C. Riccio; editors; OpenGL Insights; pages 173â€“181. CRC Press; 2012.
 S. Gustavson. Procedural textures in GLSL. In P. Cozzi and C. Riccio; editors; OpenGL Insights; pages 105â€“120. CRC Press; 2012.
 S. Gustavson and R. Strand. Anti-aliased euclidean distance transform. Pattern Recogn. Lett.; 32(2):252â€“257; Jan. 2011.
 P. Hanrahan and J. Lawson. A language for shading and lighting calculations. In Proceedings of the 17th annual conference on Computer graphics and interactive techniques; SIGGRAPH â€™90; pages 289â€“298; New York; NY; USA; 1990. ACM.
 I. McEwan; D. Sheets; M. Richardson; and S. Gustavson. Efficient computational noise in GLSL. Journal of Graphics Tools; 16(2):85â€“94; 2012.
 K. Perlin. An image synthesizer. SIGGRAPH Comput. Graph.; 19(3):287â€“296; July 1985.
 S. Upstill. RenderMan Companion: A Programmerâ€™s Guide to Realistic Computer Graphics. Addison-Wesley Longman Publishing Co.; Inc.; Boston; MA; USA; 1989.
 S.Worley. A cellular texture basis function. In Proceedings of the 23rd annual conference on Computer graphics and interactive techniques; SIGGRAPH â€™96; pages 291â€“294; New York; NY; USA; 1996. ACM.