Light Manipulation for an Expressive Depiction of Shape and Depth

Keywords :

• rendering
• shading
• cast shadows
• shape depiction

In my work, I have been interested in the use of lighting by traditional artists as a tool to effectively depict shape and depth. More specifically, my case study are the hand-painted mountain panoramas of Pierre Novat. However "realistic" they may seem, they are in fact a very personal representation of the landscape. Several mechanisms (geometric deformations, inconsistent lighting, cartographic elements) are articulated to best serve our perception of the terrain.

Based on the analysis of lighting in these panoramas and on research in computer graphics, visual perception, and cartography, I propose methods for the expressive rendering of lighting in synthetic images.

I will present the three following contributions:

1. Stylistic Study of the Hand-Painted Winter Panoramas of Pierre Novat
2. Local Light Alignment for Multi-Scale Shape Depiction
3. Multi-Scale Cast Shadows for Relief Depiction

Directors:

• Joëlle Thollot (Université Grenoble Alpes )
• Romain Vergne (Université Grenoble Alpes )

Raporteurs:

• Bernhard Jenny (Monash University )
• Xavier Granier (Institut d'Optique, Université Paris-Saclay )

Examinators:

• Sidonie Christophe (Université Gustave Eiffel, IGN )
• Jean-Sébastien Franco (Université Grenoble Alpes )
• Rémi Ronfard (Inria Rhône-Alpes )