Blend maps: enhanced terrain texturing

Very large textures are prohibitive for most interactive terrain rendering due to the use of excessive resources. Alternatively, tiled textures can be linearly blended to produce interesting transitions between predefined textures. However, these transitions seldom work well when the texture frequency content is not high. This paper introduces blend maps, a technique used to enhance the blending of textures so that features of the underlying texture are maintained or emphasised. The resulting texture appears more realistic in many cases, and adds to the perceived detail of the terrain. Blend maps are constructed by identifying important features in a texture. These features are often highlighted under certain lighting conditions. The blend maps are created manually, but some automation is possible. The importance is then used to control a blending operation in such a way that features can be preserved. The proposed algorithm is simple enough to allow realtime rendering on modern graphics hardware.

[1]  Gernot Schaufler,et al.  Nailboards: A Rendering Primitive for Image Caching in Dynamic Scenes , 1997, Rendering Techniques.

[2]  Marie-Paule Cani,et al.  Pattern-based texturing revisited , 1999, SIGGRAPH.

[3]  Manuel Menezes de Oliveira Neto,et al.  Relief texture mapping , 2000, SIGGRAPH.

[4]  Yizhou Yu,et al.  Feature matching and deformation for texture synthesis , 2004, SIGGRAPH 2004.

[5]  Carl Gutwin,et al.  Multiblending: displaying overlapping windows simultaneously without the drawbacks of alpha blending , 2004, CHI.

[6]  Hugues Hoppe,et al.  Parallel controllable texture synthesis , 2005, SIGGRAPH 2005.

[7]  Song-Chun Zhu,et al.  Visual learning by integrating descriptive and generative methods , 2001, Proceedings Eighth IEEE International Conference on Computer Vision. ICCV 2001.

[8]  J. Dollner,et al.  Texturing techniques for terrain visualization , 2000, Proceedings Visualization 2000. VIS 2000 (Cat. No.00CH37145).

[9]  Chin-Chen Chang,et al.  Synthesizing transition textures on succession patterns , 2005, GRAPHITE '05.

[10]  Sylvain Lefebvre,et al.  Pattern based procedural textures , 2003, I3D '03.

[11]  Christopher J. Migdal,et al.  The clipmap: a virtual mipmap , 1998, SIGGRAPH.

[12]  Jitendra Malik,et al.  Textons, contours and regions: cue integration in image segmentation , 1999, Proceedings of the Seventh IEEE International Conference on Computer Vision.

[13]  Victoria Interrante,et al.  Compositing color with texture for multi-variate visualization , 2005, GRAPHITE.