Griessmair, JosefPurgathofer, Werner2015-10-052015-10-0519891017-4656http://dx.doi.org/10.2312/egtp.19891010Solid geometric models can be deformed to free-form solids by the use of trivariate B-splines. This paper describes the problems of implementing such transformations for shaded rendering. The surfaces are subdivided into triangles adaptively so that the error in image space is limited. This adaptive triangulation ensures a smooth appearance of the resulting pictures.10.2312/egtp.19891010