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marching squares : ウィキペディア英語版
marching squares
Marching squares is a computer graphics algorithm that generates contours for a two-dimensional scalar field (rectangular array of individual numerical values). A similar method can be used to contour 2D triangle meshes.
The contours can be of two kinds:
* ''Isolines'' - lines following a single data level, or ''isovalue''.
* ''Isobands'' - filled areas between isolines.
Typical applications include the Contour lines on topographic maps or the generation of isobars for weather maps.
Marching squares takes a similar approach to the 3D marching cubes algorithm:
* Process each cell in the grid independently.
* Calculate a cell index using comparisons of the contour level(s) with the data values at the cell corners.
* Use a pre-built lookup table, keyed on the cell index, to describe the output geometry for the cell.
* Apply linear interpolation along the boundaries of the cell to calculate the exact contour position.
== Isoline ==


抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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