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Potential energy surfaces of chemical reactions can be explored efficiently by rendering in the haptic device the gradients calculated with first\u2010principles methods. The underlying potential energy surface is accurately fitted on the fly by the interpolating moving least\u2010squares (IMLS) scheme to a grid of quantum chemical electronic energies (and geometric gradients). In addition, we introduce a new IMLS\u2010based method to locate minimum\u2010energy paths between two points on a potential energy surface. \u00a9 2009 Wiley Periodicals, Inc. 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