This class computes the traveling time T using the fast marching method for arbitrary triangulated meshes.
If the equation is solved multiple times, computation time is saved by re-using unchanged values.
The quality of the result depends on the quality of the triangulation. For a high accuracy the triangulation
should not contain too many non-acute triangles.
@param
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The time cost function defined on the geometry.
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The narrow-band of the fast marching method.
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