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We have also developed a real\u2010time implementation of the Kubelka\u2010Munk reflectance model for pigment mixing, compositing and rendering entirely on graphics hardware, using programmable fragment shading capabilities. We have integrated our paint model with a prototype painting system, which demonstrates the model's effectiveness in rendering viscous paint and capturing a thick,<jats:italic>impasto<\/jats:italic>\u2010like style of painting. Several users have tested our prototype system and were able to start creating original art work in an intuitive manner not possible with the existing techniques in commercial systems. 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