Sketch Based Modeling Algorithm Using Shape from Shading
Guoyu Sun · Journal of Engineering Graphics · 2006
A sketch based algorithm for designing freeform models using the technique of Shape from Shading is provided.In the first step,the user drawn contour curve that forms a closed region in a representation called displaced subdivision curve.In the second step,a smooth distance field within the closed region is computed according to the shortest path of each interior point to the contour curve,where the distance field can be fine-tuned using some curve adjustment method.A model part is generated on top of the distance field using the technique of shape from shading in the third step.Finally a complete model is obtained by interactively assembling the individual parts generated in the previous steps.The algorithm emphasizes the style of handwriting,and the interactive style of ‘What You See Is What You Get’.It can be widely used in 3D modeling of the animation,model designing in game and computer aided instruction(CAI) and so on.