SHAD3S: A model to Sketch, Shade and Shadow

• URL: http://arxiv.org/abs/2011.06822v3
• Date: Sun, 5 Sep 2021 02:16:43 GMT
• Title: SHAD3S: A model to Sketch, Shade and Shadow
• Authors: Raghav B. Venkataramaiyer, Abhishek Joshi, Saisha Narang and Vinay P. Namboodiri
• Abstract summary: Hatching is a common method used by artists to accentuate the third dimension of a sketch, and to illuminate the scene. Our system SHAD3S attempts to compete with a human at hatching generic three-dimensional (3D) shapes, and also tries to assist her in a form exploration exercise.
• Score: 20.209172586699175
• License: http://creativecommons.org/licenses/by-sa/4.0/
• Abstract: Hatching is a common method used by artists to accentuate the third dimension of a sketch, and to illuminate the scene. Our system SHAD3S attempts to compete with a human at hatching generic three-dimensional (3D) shapes, and also tries to assist her in a form exploration exercise. The novelty of our approach lies in the fact that we make no assumptions about the input other than that it represents a 3D shape, and yet, given a contextual information of illumination and texture, we synthesise an accurate hatch pattern over the sketch, without access to 3D or pseudo 3D. In the process, we contribute towards a) a cheap yet effective method to synthesise a sufficiently large high fidelity dataset, pertinent to task; b) creating a pipeline with conditional generative adversarial network (CGAN); and c) creating an interactive utility with GIMP, that is a tool for artists to engage with automated hatching or a form-exploration exercise. User evaluation of the tool suggests that the model performance does generalise satisfactorily over diverse input, both in terms of style as well as shape. A simple comparison of inception scores suggest that the generated distribution is as diverse as the ground truth.

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