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Action:
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Gets a cylinder enclosing a
bs3_curve.
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Prototype:
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void bs3_curve_cylinder (
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bs3_curve cu,
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// given curve
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SPAposition& root,
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// returned cylinder root
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// point
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SPAunit_vector& axis,
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// returned cylinder axis
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double& rad
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// returned cylinder radius
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);
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Includes:
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#include "kernel/acis.hxx"
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#include "baseutil/vector/position.hxx"
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#include "baseutil/vector/unitvec.hxx"
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#include "kernel/spline/bs3_crv/bs3curve.hxx"
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#include "kernel/spline/d3_bs3/spd3rtn.hxx"
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Description:
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The cylinder axis is parallel to the line between its end points, and its radius is the minimum required to enclose all the B-spline control points.
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The method is:
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First, set the axis to the line from
P1 to
Pn (these being the first and last vertexes in the B-spline hull).
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Second, find the vertex furthest from this line. Move the axis parallel to itself, halfway to this vertex.
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Third, find the vertex furthest from the new axis. Use the distance to this vertex as the cylinder radius.
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Library:
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kernel
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Filename:
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kern/kernel/spline/d3_bs3/spd3rtn.hxx
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Effect:
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Changes model
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