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384 lines
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<h1><span style="font-size: 12pt;"><font size=3 style="font-size:12pt;"><img src="image41.gif" width="25px" height="24px" border="0" class="img_whs1"></font></span>Shape Processing</h1>
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<p class="whs2"><b style="font-weight: normal;">T</b>o produce
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a <span style="font-weight: bold;"><B>Shape Processing</B></span> operation in
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the Main Menu select <span style="font-weight: bold;"><B>Repair - ></B></span>
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<span style="font-weight: bold;"><B>Shape Processing.</B></span></p>
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<p class="whs2">This operation processes one or more shapes
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using various operators.</p>
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<p class="whs2"> </p>
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<p class="whs2"><b><span style="font-weight: normal;">The</span>
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Result <span style="font-weight: normal;">will be a</span></b><b> <span
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style="font-weight: bold;"><B>GEOM_Object</b>.</B></span></p>
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<p class="whs2"> </p>
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<p class="whs2"><b style="font-weight: bold;">TUI Command:</b><i>
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</i><span style="font-style: italic;"><I>geompy.ProcessShape(Shape, Operators,
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Parameters, Values)</I></span>, where Shape is a processed shape, Operators
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is a list of operators ("FixShape", "SplitClosedFaces",
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etc.), Parameters is a list of parameters (<28>FixShape.Tolerance3d<33>, etc),
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Values is a list of values of parameters placed in the same order as in
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the list of Parameters .</p>
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<p class="whs2"> </p>
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<p class="whs2">In this dialog box you can select the object
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that you need to process, define its name and operators applied to it
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during processing. </p>
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<p class="whs2"> </p>
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<p class="whs3"><img src="pics/repair1.png" x-maintain-ratio="TRUE" width="403px" height="469px" border="0" class="img_whs4"></p>
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<p class="whs3"> </p>
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<p class="whs5">Operators and Parameters<span
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style="font-weight: normal;"> (TUI names are given in brackets)</span></p>
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<p class="whs2"> </p>
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<ul type="disc" class="whs6">
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<li class=kadov-p><p class="whs2"><span style="font-weight: bold;"><B>Fix
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Shape</B></span> (FixShape) - corrects invalid shapes. </p></li>
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<li class=kadov-p><p class="whs7"><span
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style="font-weight: bold;"><B>3D Tolerance</B></span> (FixShape.Tolerance3d)
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- work tolerance for detection of the problems and correction of them.</p></li>
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<li class=kadov-p><p class="whs7"><span
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style="font-weight: bold;"><B>Max 3D Tolerance</B></span> (FixShape.MaxTolerance3d)
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- maximal
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possible tolerance of the shape after correction.</p></li>
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<li class=kadov-p><p class="whs8"><span
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style="font-weight: bold;"><B>Fix Face Size</B></span> (FixFaceSize) - removes
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small faces, such as spots and strips. </p></li>
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<li class=kadov-p><p class="whs7"><span
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style="font-weight: bold;"><B>Tolerance</B></span> (FixFaceSize.Tolerance) -
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defines minimum possible face size.</p></li>
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<li class=kadov-p><p class="whs8"><span
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style="font-weight: bold;"><B>Drop Small Edges</B></span> (DropSmallEdges) -
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removes edges, which merge with neighbouring edges.</p></li>
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<li class=kadov-p><p class="whs7"><span
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style="font-weight: bold;"><B>3D Tolerance</B></span> (DropSmallEdges.Tolerance3d)
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- defines minimum possible distance between two parallel edges.</p></li>
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<li class=kadov-p><p class="whs8"><span
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style="font-weight: bold;"><B>Split Angle</B></span> (SplitAngle) - splits faces
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based on conical surfaces, surfaces of revolution and cylindrical surfaces
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in segments using a certain angle . </p></li>
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<li class=kadov-p><p class="whs7"><span
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style="font-weight: bold;"><B>Angle</B></span> (SplitAngle.Angle) - the central
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angle of the resulting segments (i.e. we obtain two segments if Angle=180,
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four if Angle=90, etc).</p></li>
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<li class=kadov-p><p class="whs7"><span
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style="font-weight: bold;"><B>Max. Tolerance</B></span> (SplitAngle.MaxTolerance)
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- maximum possible tolerance among the resulting segments.</p></li>
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<li class=kadov-p><p class="whs9">Split Closed Faces
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<span style="font-weight: normal;">(SplitClosedFaces)</span> - <span style="font-weight: normal;">splits
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closed faces in segments. The number of segments depends on the number
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of splitting points.</span></p></li>
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<li class=kadov-p><p class="whs7"><span
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style="font-weight: bold;"><B>Number of splitting points</B></span> (SplitClosedFaces.NbSplitPoints)
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- the number of splitting points.</p></li>
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<li class=kadov-p><p class="whs9">Split Continuity<span
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style="font-weight: normal;"> (SplitContinuity) - splits shapes to reduce
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continuities of curves and surfaces.</span></p></li>
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<li class=kadov-p><p class="whs10">3D Tolerance<span style="font-weight: normal;">
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(SplitContinuity.Tolerance3d) - 3D tolerance for correction of geometry.</span></p></li>
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<li class=kadov-p><p class="whs10">Surface Continuity<span
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style="font-weight: normal;"> (SplitContinuity.SurfaceContinuity) - required
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continuity for surfaces.</span></p></li>
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<li class=kadov-p><p class="whs10">Curve Continuity <span
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style="font-weight: normal;">(SplitContinuity.CurveContinuity)</span>
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- <span style="font-weight: normal;">required continuity for curves.</span></p></li>
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</ul>
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<p class="whs11">This and the previous parameters can
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take the following values:</p>
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<p class="whs12"><span style="font-size: 12pt; font-weight: normal;"><font size=3 style="font-size:12pt;"><span
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style="font-size: 12pt; font-weight: normal;"><font size=3 style="font-size:12pt;">P</font></span>arametric Continuity
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</font></span></p>
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<p class="whs12"><span style="font-weight: bold;"><B>C0</B></span>
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(Positional Continuity): curves are joined (the end positions of curves
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or surfaces are coincidental. The curves or surfaces may still meet at
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an angle, giving rise to a sharp corner or edge).</p>
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<p class="whs12"><span style="font-weight: bold;"><B>C1</B></span>
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(Tangential Continuity): first derivatives are equal (the end vectors
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of curves or surfaces are parallel, ruling out sharp edges). </p>
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<p class="whs12"><span style="font-weight: bold;"><B>C2</B></span>
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(Curvature Continuity): first and second derivatives are equal (the end
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vectors of curves or surfaces are of the same magnitude).</p>
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<p class="whs12"><span style="font-weight: bold;"><B>CN</B></span>
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N-th derivatives are equal (both the direction and the magnitude of the
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Nth derivatives of curves or surfaces (d/du C(u)) are the same at junction.</p>
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<p class="whs12">Geometric Continuity </p>
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<p class="whs12"><span style="font-weight: bold;"><B>G1</B></span>:
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first derivatives are proportional at junction</p>
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<p class="whs12">The curve tangents thus have the same
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direction, but not necessarily the same magnitude. i.e., C1'(1) = (a,b,c)
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and C2'(0) = (k*a, k*b, k*c). </p>
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<p class="whs12"><span style="font-weight: bold;"><B>G2</B></span>:
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first and second derivatives are proportional at junction </p>
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<p class="whs12">As the names imply, geometric continuity
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requires the geometry to be continuous, while parametric continuity requires
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that the underlying parameterization was continuous as well. </p>
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<p class="whs12">Parametric continuity of order n implies
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geometric continuity of order n, but not vice-versa. </p>
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<ul type="disc" class="whs6">
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<li class=kadov-p><p class="whs13"><span style="font-weight: bold;"><B>Bspline
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Restriction</B></span> (BsplineRestriction) - converts curves and surfaces
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to Bsplines and processes them with the following parameters:</p></li>
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<li class=kadov-p><p class="whs14">Surface Mode<span style="font-weight: normal;">
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(BSplineRestriction.SurfaceMode) - approximation of surfaces if restriction
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is necessary.</span></p></li>
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<li class=kadov-p><p class="whs14">3D Curve Mode<span
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style="font-weight: normal;"> (BSplineRestriction.Curve3dMode) - conversion
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of any 3D curve to BSpline and approximation.</span></p></li>
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<li class=kadov-p><p class="whs14">2D Curve Mode<span
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style="font-weight: normal;"> (BSplineRestriction.Curve2dMode) -</span>
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<span style="font-weight: normal;">conversion of any 2D curve to BSpline
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and approximation.</span></p></li>
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<li class=kadov-p><p class="whs11"><span style="font-weight: bold;"><B>3D
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Tolerance</B></span> (BSplineRestriction.Tolerance3d) - defines the possibility
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of surfaces and 3D curves approximation with the specified parameters.</p></li>
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<li class=kadov-p><p class="whs11"><span style="font-weight: bold;"><B>2D
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Tolerance</B></span> (BSplineRestriction.Tolerance2d) - defines the possibility
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of surfaces and 2D curves approximation with the specified parameters.</p></li>
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<li class=kadov-p><p class="whs11"><span style="font-weight: bold;"><B>Required
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Degree</B></span> (BSplineRestriction.RequiredDegree) - required degree of
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the resulting BSplines.</p></li>
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<li class=kadov-p><p class="whs11"><span style="font-weight: bold;"><B>Required
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number of segments</B></span> (BSplineRestriction.RequiredNbSegments) - required
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maximum number of segments of resultant BSplines</p></li>
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<li class=kadov-p><p class="whs11"><span style="font-weight: bold;"><B>3D
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Continuity</B></span> (BSplineRestriction.Continuity3d) - continuity of the
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resulting surfaces and 3D curves.</p></li>
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<li class=kadov-p><p class="whs11"><span style="font-weight: bold;"><B>2D
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Continuity</B></span> (BSplineRestriction.Continuity2d) - continuity of the
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resulting 2D curves.</p></li>
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<li class=kadov-p><p class="whs8"><span
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style="font-weight: bold;"><B>To Bezier</B></span> (ToBezier) - converts curves
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and surfaces of any type to Bezier curves and surfaces. </p></li>
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<li class=kadov-p><p class="whs14">Surface Mode<span style="font-weight: normal;">
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(ToBezier.SurfaceMode) - if checked in, allows conversion of surfaces.</span></p></li>
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<li class=kadov-p><p class="whs14">3D Curve Mode <span
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style="font-weight: normal;">(ToBezier.Curve3dMode) - if checked in, allows
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conversion of 2D curves.</span></p></li>
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<li class=kadov-p><p class="whs14">2D Curve Mode <span
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style="font-weight: normal;">(ToBezier.Curve2dMode) - if checked in, allows
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conversion of 3D curves.</span></p></li>
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<li class=kadov-p><p class="whs14">Max Tolerance<span
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style="font-weight: normal;"> (ToBezier.MaxTolerance) </span>- <span style="font-weight: normal;">defines</span>
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<span style="font-weight: normal;">tolerance for detection and correction
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of problems.</span> </p></li>
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<li class=kadov-p><p class="whs15">Same Parameter<span
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style="font-weight: normal;"> (SameParameter) <20> fixes
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edges of 2D and 3D curves not having the same parameter.</span> </p></li>
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<li class=kadov-p><p class="whs7"><span
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style="font-weight: bold;"><B>3D Tolerance</B></span> (SameParameter.Tolerance3d)
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<20> defines<span style="font-weight: bold;"> <B></B></span>tolerance for fixing
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of edges.<span style="font-weight: bold;"> <B></B></span></p></li>
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</ul>
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<p class="whs2"> </p>
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<p class="whs2"><b style="font-weight: bold;">Dialog Box:</b></p>
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<p class="whs2"> </p>
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<p class="whs3"><img src="pics/repair1.png" x-maintain-ratio="TRUE" width="403px" height="469px" border="0" class="img_whs4"></p>
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<p class="whs3"> </p>
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<p class="whs2"> </p>
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<p class="whs2"><b style="font-weight: bold;">Example:</b></p>
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<p> </p>
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<p class="whs2">Shape before applying Shape Processing (FixShape
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operator).</p>
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<p class="whs2"> </p>
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<p class="whs3"><img src="image154.jpg" width="300px" height="214px" border="0" class="img_whs16"> <img src="image156.jpg" width="244px" height="214px" border="0" class="img_whs17"></p>
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<p class="whs18"> </p>
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<p class="whs19">The
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same shape after applying Shape Processing.</p>
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<p class="whs18"> </p>
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<p class="whs3"><img src="image160.jpg" width="239px" height="214px" border="0" class="img_whs20"></p>
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<p class="whs21"> </p>
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<p class="whs21"><span style="font-weight: normal;">Our</span>
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TUI Scripts<span style="font-weight: normal;"> provide you with useful
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examples of the use of</span> <a href="repairing_operations.htm#bookmark">Repairing
|
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Operations</a>. </p>
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<p> </p>
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