An artist friendly hair shading system

Rendering hair in motion pictures is an important and challenging task. Despite much research on physically based hair rendering, it is currently difficult to benefit from this work because physically based shading models do not offer artist friendly controls. As a consequence much production work so far has used ad hoc shaders that are easier to control, but often lack the richness seen in real hair. We show that physically based shading models fail to provide intuitive artist controls and we introduce a novel approach for creating an art-directable hair shading model from existing physically based models. Through an informal user study we show that this system is easier to use compared to existing systems. Our shader has been integrated into the production pipeline at the Walt Disney Animation Studios and is being used in the production of the upcoming animated feature film Tangled.

[1]  James T. Kajiya,et al.  Rendering fur with three dimensional textures , 1989, SIGGRAPH.

[2]  Jonathan Grudin,et al.  Obstacles to participatory design in large product development organizations , 1990 .

[3]  I. Sadeghi Efficient Implementation of the Dual Scattering Model in RenderMan , 2010 .

[4]  L. Petrovic,et al.  Volumetric Methods for Simulation and Rendering of Hair , 2006 .

[5]  Dan B. Goldman Fake fur rendering , 1997, SIGGRAPH.

[6]  Jan Gulliksen,et al.  User-centered System Design , 2011 .

[7]  Steve Marschner,et al.  Light scattering from human hair fibers , 2003, ACM Trans. Graph..

[8]  Ivan Neulander Quick image-based lighting of hair , 2004, SIGGRAPH '04.

[9]  Steve Marschner,et al.  Efficient multiple scattering in hair using spherical harmonics , 2008, ACM Trans. Graph..

[10]  Ulrich Neumann,et al.  Modeling, rendering and animating human hair , 2002 .

[11]  Arno Zinke,et al.  Light Scattering from Filaments , 2007, IEEE Transactions on Visualization and Computer Graphics.

[12]  Donald A. Norman,et al.  User Centered System Design: New Perspectives on Human-Computer Interaction , 1988 .

[13]  Frédo Durand,et al.  Single Photo Estimation of Hair Appearance , 2009 .

[14]  Steve Marschner,et al.  A Survey on Hair Modeling: Styling, Simulation, and Rendering , 2007, IEEE Transactions on Visualization and Computer Graphics.

[15]  Frédo Durand,et al.  Hair photobooth: geometric and photometric acquisition of real hairstyles , 2008, ACM Trans. Graph..

[16]  John Hart,et al.  ACM Transactions on Graphics , 2004, SIGGRAPH 2004.

[17]  Cem Yuksel,et al.  Dual scattering approximation for fast multiple scattering in hair , 2008, ACM Trans. Graph..

[18]  Arno Zinke,et al.  Ibero-american Symposium on Computer Graphics -siacg (2006) Global Illumination for Fiber Based Geometries , 2022 .

[19]  Steve Marschner,et al.  Simulating multiple scattering in hair using a photon mapping approach , 2006, ACM Trans. Graph..

[20]  Reinhard Klein,et al.  A practical approach for photometric acquisition of hair color , 2009, ACM Trans. Graph..

[21]  Douglas Schuler,et al.  Participatory Design: Principles and Practices , 1993 .

[22]  Colin Potts,et al.  Design of Everyday Things , 1988 .

[23]  Ming-Hui Wen,et al.  Body and mind: a study of avatar personalization in three virtual worlds , 2009, CHI.