Selectively collapses edges based on length or angle.
To apply: Select the some edges, then choose from the Model toolbar.
To redisplay: Select the polygon mesh, click the button on the Select panel, then click the Edge Filter Op icon.
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Displays the number of and in the resulting mesh. These values are for information only; they cannot be changed directly, but will change as a result
of other settings.
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Specifies the criterion for removing edges:
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collapses edges that are shorter than a threshold. Use the Edge Length slider to set the threshold.
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collapses vertices where two edges meet at an angular difference less than a threshold. This lets you combine edges that
are almost colinear. Vertices where three or more edges meet are never collapsed. Use the Edge Angle slider to set the threshold.
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Collapses edges shorter than this value in Softimage units, when Filter Type is set to Edge Length.
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Collapses vertices where two edges meet with an angular difference smaller than this value in degrees, when Filter Type is
set to Edge Angle.
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Prevents boundary edges from being removed by the filtering operation.
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Poly. Mesh 
