Method and apparatus for shadow estimation and spreading
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United States of America Patent
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Dec 27, 2016
Grant Date -
May 12, 2016
app pub date -
Nov 11, 2014
filing date -
Nov 11, 2014
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Abstract
A computer-implemented method for creating an image that depicts shadowing for a specified light source even though the input data is not three-dimensional and is limited to elevation data that associates an elevation value with each of a plurality of spatial coordinates. Plumb line walls are generated between elevation points of neighboring grid cells for each elevation point meeting a specified delta elevation criterion. A shadow map is accumulated based on visibility of each pixel to the light source position, and then, in a subsequent pass through the coordinate pixels of the data, an image is created in a tangible medium with each pixel correspondingly visible or shadowed, either totally or partially. Values along one dimension may be spread over a Z-buffer range to optimally resolve visibility features.
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