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EvaluatePositionFromPercentage (NurbsCurve) *

Description

Returns a 3D vector containing the position, tangent in U direction, normal and bi-normal at a given percentage along the curve.

Scripting Syntax

NurbsCurve.EvaluatePositionFromPercentage( Percentage )

C# Syntax

Object NurbsCurve.EvaluatePositionFromPercentage( Double in_dPercentage );

Parameters

Return Value

A 1-dimensional Array containing the position, tangent, normal and bi-normal.

Examples

1. VBScript Example

set oRoot = Application.ActiveProject.ActiveScene.Root
set oArc = oRoot.AddGeometry( "Arc", "NurbsCurve" )
aValues = oArc.ActivePrimitive.Geometry.Curves(0).EvaluatePositionFromPercentage( 70.0 )

set oPosition = aValues(0)
logmessage "The position at 70%% of the curve is x :" &  oPosition.x & " y: " & oPosition.y & " z: " & oPosition.z

set oUTangent = aValues(1)
logmessage "The tangent in U at 70%% of the curve is x :" & oUTangent.x & " y: " & oUTangent.y & " z: " & oUTangent.z

set oNormal = aValues(2)
logmessage "The normal at 70%% of the curve is x :" & oNormal.x & " y: " & oNormal.y & " z: " & oNormal.z

set oBiNormal = aValues(3)
logmessage "The bi-normal at 70%% of the curve is x :" & oBiNormal.x & " y: " & oBiNormal.y & " z: " & oBiNormal.z

2. JScript Example

SICreateCurve("crvlist", 3, 0);
SIAddPointOnCurveAtEnd("crvlist", -3.951, 0.000, 1.651, false);
SIAddPointOnCurveAtEnd("crvlist", -3.214, 0.000, -1.884, false);
SIAddPointOnCurveAtEnd("crvlist", -0.592, 0.000, 1.146, false);
SIAddPointOnCurveAtEnd("crvlist", 1.660, 0.000, 2.856, false);
SIAddPointOnCurveAtEnd("crvlist", 3.272, 0.000, -1.224, false);

GetNurbsCurveListInfo( GetValue("crvlist") );

function GetNurbsCurveListInfo( oCurveList )
{
   var oPosition, oUTangent, oNormal, oBiNormal;
   var p = XSIMath.CreateVector3();
   oGeometry = oCurveList.ActivePrimitive.Geometry;

   // Display curve list info
   LogMessage( "    Name: " + oCurveList.Name );
   LogMessage( "FullName: " + oCurveList.FullName );
   LogMessage( "    Type: " + oCurveList.Type );

   // Display geometry info:
   LogMessage( "      Length: " + oGeometry.Length );
   LogMessage( "      Closed: " + oGeometry.Closed );
   LogMessage( "   Nb Points: " + oGeometry.Points.Count );
   LogMessage( "  Nb Control: " + oGeometry.ControlPoints.Count );
   LogMessage( "   Nb Curves: " + oGeometry.Curves.Count );
   LogMessage( "   Nb Facets: " + oGeometry.Facets.Count );
   LogMessage( " Nb Segments: " + oGeometry.Segments.Count );
   LogMessage( " Nb Clusters: " + oGeometry.Clusters.Count );
   LogMessage( "Nb Triangles: " + oGeometry.Triangles.Count ); //crashes Softimage

   // Get the lower-level stuff
   for ( i = 0; i < oGeometry.Curves.Count; i++ ) 
   {
       LogMessage( "--- Curve["+i+"] ---" );
       oCurve = oGeometry.Curves(i);

       // Find the midpont along the curve
       var aValues = new VBArray(oCurve.EvaluatePositionFromPercentage( 50.0 ));

       var oPosition = aValues.getItem(0);
       var oUTangent = aValues.getItem(1);
       var oNormal = aValues.getItem(2);
       var oBiNormal = aValues.getItem(3);

       LogMessage( " Position[x,y,z]: " + oPosition.x +","+ oPosition.y +","+ oPosition.z );
       LogMessage( "U Tangent[x,y,z]: " + oUTangent.x +","+ oUTangent.y +","+ oUTangent.z );
       LogMessage( "   Normal[x,y,z]: " + oNormal.x   +","+ oNormal.y +","+ oNormal.z   );
       LogMessage( "Bi Normal[x,y,z]: " + oBiNormal.x +","+ oBiNormal.y +","+ oBiNormal.z );

       // Display the info
       LogMessage( "   Nb Knots: " + oCurve.Knots.Count );
       LogMessage( "   Degree: "   + oCurve.Degree      );
   }

   return(0);
}

See Also

Autodesk Softimage v7.5     <     >