Proceedings: GI 1996

Painting gradients: free-form surface design using shading patterns

C. van Overveld

Proceedings of Graphics Interface '96: Toronto, Ontario, Canada, 22 - 24 May 1996, 151-158

DOI 10.20380/GI1996.18

  • BibTeX

     title = {Painting gradients: free-form surface design using shading patterns},
     author = {C.W.A.M. van Overveld},
     booktitle = {Proceedings of the Graphics Interface 1996 Conference, May 22-24, 1996, Toronto, Ontario, Canada},
     year = {1996},
     month = {May},
     isbn = {0-9695338-5-3},
     publisher = {Canadian Human-Computer Communications Society},
     url = {},
     pages = {151--158}


An interactive system for designing curved surfaces is proposed which is based on direct manipulation of a single-view shaded image of this surface. Apart from functions like carving in the surface or adding to it, and local smoothing, sharpening or shifting of selected surface regions, the system supports painting local gradient distributions. An iterative algorithm enforces conservativity of the gradient map at all times, so that the shaded image corresponds everywhere to a possible 3-dimensional surface. This surface can be output either as a gradient map, to be used e.g. in bump mapping, or as an adaptively tiled triangular mesh.