This work introduces a technique for interactive walkthroughs of non-photorealistically rendered (NPR) scenes using 3D line primitives to define architectural features of the model, as well as indicate textural qualities. Line primitives are not typically used in this manner in favor of texture mapping techniques which can encapsulate a great deal of information in a single texture map, and take advantage of GPU optimizations for accelerated rendering. However, texture mapped images may not maintain the visual quality or aesthetic appeal that is possible when using 3D lines to simulate NPR scenes such as hand-drawn illustrations or architectural renderings. In addition, line textures can be modified interactively, for instance changing the sketchy quality of the lines, and can be exported as vectors to allow the automatic generation of illustrations and further modification in vector-based graphics programs. The technique introduced here extracts feature edges from a model, and using these edges, generates a reduced set of line textures which indicate material properties while maintaining interactive frame rates. A clipping algorithm is presented to enable 3D lines to reside only in the interior of the 3D model without exposing the underlying triangulated mesh. The resulting system produces interactive illustrations with high visual quality that are free from animation artifacts.
@TechReport{ potter:2007:LTVC,
author = {Kristin Potter and Amy Gooch and Bruce Gooch and
Peter Willemsen and Joe Kniss and Richard Riesenfeld
and Peter Shirley},
title = {3D Line Textures and the Visualization of Confidence
in Architecture},
institution = {University of Utah},
year = {2007},
number = {UUCS-07-005},
}
BUR DE N E. E. : Entourage: A Tracing File for Architects and Interior Design. McGraw-Hill Professional Publishing, 1995. 7
DOOL E Y D. , COHE N M. F. : Automatic illus- tration of 3d geometric models: Lines. In Pro- ceedings of the Symposium on Interactive 3D Graphics (1990), pp. 77-82. 2
DE US S E N O. , S T ROT HOT T E T. : Computer- generated pen-and-ink illustration of trees. In Proceedings of ACM SIGGRAPH 2000 (2000), pp. 13-18. 7
DOL L NE R J . , WALT HE R M. : Real-time ex- pressive rendering of city models. In Proceed- ings of Information Visualization 2003 (2003), pp. 245-250. 3
F R E UDE NB E R G B. , MAS UC H M. , S T ROT HOT T E T. : Walk-through illustra- tions: Frame-coherent pen-and-ink style in a game engine. Computer Graphics Forum: Pro- ceedings of Eurographics 2001 20, 3 (2001), 184-191. 2, 3
GE UZ AI NE C. : Gl2ps: an opengl to postscript printing library. http://www.geuz.org/gl2ps/. 7
GOOC H B. , GOOC H A. : Non-Photorealistic Rendering. A.K. Peters, 2001. 2
KAP L AN M. , GOOC H B. , COHE N E. : Interac- tive artistic rendering. In Proceedings of the 1st International Symposium on Non-Photorealistic Animation and Rendering (2000), pp. 67-74. 3
KL E I N A. W. , LI W. W. , KAZ HDAN M. M. , COR R E A W. T. , F I NKE L S T E I N A. , F UNKHOUS E R T. A. : Non-photorealistic virtual environments. In Proceedings ACM SIGGRAPH 2000 (2000), pp. 527-534. 3
KOWAL S KI M. A. , MAR KOS I AN L. , NORT HRUP J . , BOUR DE VY L. , BAR Z E L R. , HOL DE N L. S . , HUGHE S J . F. : Art- based rendering of fur, grass, and trees. In Proceedings of ACM SIGGRAPH 99 (1999), pp. 433-438. 3
LI N M. W. : Drawing and Designing With Con- fidence : A Step-By-Step Guide. John Wiley & Sons, 1997. 7
MI YATA K. : A method of generating stone wall patterns. In Proceedings of ACM SIGGRAPH 90 (1990), pp. 387-394. 3
MAR KOS I AN L. , ME I E R B. J . , KOWAL S KI M. A. , HOL DE N L. S . , NORT HRUP J . D. , HUGHE S J . F. : Art-based rendering with continuous levels of detail. In Proceedings of the 1st International Symposium on Non- Photorealistic Animation and Rendering (NPAR 2000) (2000), pp. 59-66. 3