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SPAkern Global Function bs3_surface_span_range_u

Gets the u parameter bounds of a surface's simple patches.

Role: If the surface is an array of simple patches, numbered sequentially in the increasing u and v directions, starting at 0.0, return the u parameter bounds of the patches indexed in the u direction by the given integer.

This routine returns an empty interval if the index is out of the range implied by the value returned by bs3_surface_nspans_u.

Effect: Read-only

Parameters:

i

span number n in u direction.

sur

given surface.

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