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”
SurfaceFlows_Brush Surface Flows for Image-Based Shading Design,
Romain Vergne, Pascal Barla, Xavier Granier, Roland Fleming,
ACM Transactions on Graphics (Proceedings of Siggraph 2012).
Archive  –  paper  –  suppmat  –  video  – demo video 
Nekko A Vectorial Solver for Free-form Vector Gradient
Simon Boyé, Pascal Barla, Gael Guennebaud.
Transaction on Graphics, ACM, 2012, Proceedings of Siggraph Asia 2012.
Archive  –  paper  –  video  –  webGL demo library
 zephir_result Diffusion Curves: A Vector Representation for Smooth-Shaded Images,
Alexandrina Orzan, Adrien Bousseau, Holger Winnemöller, Pascal Barla, Joëlle Thollot, David Salesin,
ACM Transaction on Graphics (Proceedings of SIGGRAPH 2008), Volume 27, Number 3 – 2008
Archive  –  paper  –  video  –  win32 demo