Surface features

MOTIVATION: Extract features (bumps, ridges, valleys, inflections) from arbitrary surfaces at multiple scales. Applied to line-based rendering, illustrative shading, 3D shape editing, etc. INSPIRATION: Guennebaud et al work on Algebraic Point Set Surfaces. Koenderink et al work on solid shape invariants.   Screen-Space Curvature for Production-Quality Rendering and Compositing.Nicolas Mellado, Pascal Barla, Gaël Guennebaud, Patrick … Read more

Image features

MOTIVATION: Extract features (contours, lines, junctions) from arbitrary images at multiple scales. Applied to image manipulation, sketch reconstruction, color filtering, etc. INSPIRATION: The Scale-Space litterature and use of Gaussian Derivatives. Adelson et al work on steerable filters and image pyramids. Zucker et al. work on folds and flows. Flow-guided Warping for Image-based Shape ManipulationRomain Vergne, … Read more

2D animation

MOTIVATION: Assist in the creation of in-betweens from a set of keyframe poses (image, drawing, etc). Suggest correspondences, derive mappings and let users control the interpolation process. INSPIRATION: Alexa et al. as-rigid-as-possible interpolation. Sykora et al. various techniques for 2D animation. Richard William’s book “The Animator Survival Kit”. Example-based Expressive Animation of 2D Rigid BodiesMarek … Read more

Digital painting

MOTIVATION: Provide painting tools that quickly produce color gradients, highlights, texture and reflection patterns. Ease and speed up the creation process in vector and/or raster graphics, leverage artistic skills. INSPIRATION: Elder et al. image reconstruction from its luminance edges. Jeschke et al. various extensions to Diffusion Curves. Gombrich’s book “Art and Illusion” Surface Flows for … Read more

Expressive Shading

MOTIVATION: Design techniques that manipulate appearance due to material & lighting at once. Preserve stylistic choices as well as directional and/or spatial appearance variations. INSPIRATION: Sloan et al. LitSphere and its adaptations in ZBrush, MatCaps. Fleming et al. perceptual experiments on material perception. Hogarth’s book “Dynamic Light and Shade”. Local Shape Editing at the Compositing … Read more

Radiance Tweaking

MOTIVATION: Understand interactions between illumination, shape and materials with a differential analysis. Enhance, manipulate and efficiently render 3D scenes in global illumination settings. INSPIRATION: Koenderink et al. analysis of highlights produced by different materials. Ramamoorthi et al. first-order analysis of the rendering equation. Fleming et al. perceptual experiments on shape-from-reflections.   Optimizing BRDF Orientations for … Read more