Texture Generation for Expressive Rock Drawing

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This talk is about the PhD research work of Hugo Loi, about his progammable approach to design 2D arrangements for texture design. In particular, an extension of his proposition allows to specify and control the style of rendering of rock drawing in mountain maps. (Talk done at the International Cartographic Conference ICC 2017).
http://mapstyle.ign.fr

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Texture Generation for Expressive Rock Drawing

  1. 1. Texture generation for expressive rock drawing Sidonie Christophe, Hugo Loi, Mathieu Brédif, François Lecordix, Thomas Hurtut, Romain Vergne and Joëlle Thollot Univ. Paris-Est, LASTIG, IGN, ENSG, F-94160 Saint-Mande, France Univ. Grenoble Alpes, CNRS, Inria, France Polytechnique Montréal, Canada
  2. 2. 2 IGN
  3. 3. 3 IGN➔ How to design such complex textures? ➔ How to finely control the rendering style?
  4. 4. • Generic approach • Specific approach for rocky mountain Approach to design 2D arrangements (Loi et al. 2017) 4
  5. 5. • Texture specification and design: A ‘recipe’: combination of patterns, via operators Programmable approach (Loi et al. 2017) 5
  6. 6. • Generation of complex patterns Programmable approach (Loi et al. 2017) 6
  7. 7. • Generation of complex patterns Programmable approach (Loi et al. 2017) 7
  8. 8. • Generation of complex patterns Programmable approach (Loi et al. 2017) 8
  9. 9. 9 (Loi et al. 2017)
  10. 10. • How to move from an abstract texture to a textured area in a map? ▫ To identify rules and constraints in made-by-hand maps ▫ To develop a suitable transfer function between input parameters and the output image. And for the mountain? 10
  11. 11. • 2 types of hatches • one-dimensional terrain features (ridges and valleys) • surface information through global properties: density, orientation and randomness. => Spatially-varying textures: density and orientation => Control fields and related control mappers Constraints 11
  12. 12. 12 Input data used for rendering rocky areas
  13. 13. 13 (Loi 2015)
  14. 14. Proposition: hatching arrangements 14 1 filling layer + 1 ‘ink accumulation effect’ layer Initial hand-drawn hatching (Loi 2015) IGN ➔ Variation of heights, separation of mountain faces, multi-faces
  15. 15. Stylization step: a set of curves to be stylized 15 (Christophe et al. 2016)
  16. 16. Stylization step ➔ Enhancing relief perception without seeing textures 16
  17. 17. 17 (Loi 2015, Loi et al. 2017) Random or regular distributions for map design ➔ A set of curves: a vector layer in a cartographic pipeline
  18. 18. • Programmable approach: -> Specification of the targeted style -> Control over the hatching arrangement -> Iterative design of complex structures • Generation of cartographic data, followed by stylization step • Relief perception: heights, edges, passes, multi-faces Conclusion 18
  19. 19. Perspectives How to control the perception of the rendering style? • Geometries generation and stylization -> Shared influence on the quality of the distribution. -> Iterative steps to adapt 2D arrangements. • User control on the generation and stylization 19 Talk Expressive Map Design: THU 6, 11:30-11:50 (Coolidge)
  20. 20. Thank you for your attention! http://mapstyle.ign.fr sidonie.christophe@ign.fr Thanks to the French National Research Agency (ANR) MapStyle project [ANR-12-CORD-0025] 20 20 Talk Expressive Map Design: THU 6, 11:30-11:50 (Coolidge)
  21. 21. References Christophe, S., Duménieu, B., Turbet, J., Hoarau, C., Mellado, N., Ory, J., Loi, H., Masse, A., Arbelot, B., Vergne, R., Brédif, M., Hurtut, T., Thollot, J., Vanderhaeghe, D. (2016). Map Style Formalization: Rendering Techniques Extension for Cartography, Pierre Bénard; Holger Winnemöller. Expressive 2016 The Joint Symposium on Computational Aesthetics and Sketch-Based Interfaces and Modeling and Non-Photorealistic Animation and Rendering, May 2016, Lisbonne, Portugal. The Eurographics Association, Non-Photorealistic Animation and Rendering. Loi, H., Hurtut, T., Vergne, R., Thollot, J. (2017). Programmable 2D Arrangements for Element Texture Design. ACM Transactions on Graphics Volume 36 Issue 3, June 2017. Article No. 27 DOI: 10.1145/2983617 Loi, H. Programmable Synthesis of Element Textures and Application to Cartography. (2015). PhD in Computer Graphics. Université de Grenoble, 2015. English. Loi, H., Hurtut T., Vergne R., Thollot J. (2013) Discrete Texture Design Using a Programmable Approach, SIGGRAPH Talks, 2013. 21

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