v4.0
Returns the Position, U tangent, V Tangent and Normal at a given
normalized UV value in the same order as the output arguments in
NurbsSurface.EvaluateNormalizedPosition.
Note: This method must be used with scripting languages that don't
support arguments passed by reference such as JScript and
PerlScript. For more information on getting output arguments, see
About Output Argument
Arrays.
oArray = NurbsSurface.EvaluateNormalizedPosition2( UValueNormalized, VValueNormalized ); |
Array that contains SIVector3 objects representing the position, u tangent, v tangent and normal at the given UV.
| Parameter | Type | Description |
|---|---|---|
| UValueNormalized | Double | The normalized UValue(0.0 to 1.0) at which we want to evaluate the surface. |
| VValueNormalized | Double | The normalized VValue(0.0 to 1.0) at which we want to evaluate the surface. |
/*
This example illustrates how to retrieve the normalized UV value from a specific Knot
and how to use that to evaluate its position.
*/
var oSphere = ActiveSceneRoot.AddGeometry( "Sphere", "NurbsSurface" );
var oSurfaces = oSphere.ActivePrimitive.Geometry.Surfaces;
var oSurface = oSurfaces(0);
var aUKnotValues = new VBArray(oSurface.UKnots.Array);
var aVKnotValues = new VBArray(oSurface.VKnots.Array);
var aUVNormalizedValues = new VBArray( oSurface.GetNormalizedUVFromUV2(aUKnotValues.getItem(3),aVKnotValues.getItem(4)));
var aValues = new VBArray(oSurface.EvaluateNormalizedPosition2( aUVNormalizedValues.getItem(0), aUVNormalizedValues.getItem(1)));
var oPosition = aValues.getItem(0);
var oUTangent = aValues.getItem(1);
var oVTangent = aValues.getItem(2);
var oNormal = aValues.getItem(3);
LogMessage( "Position: " + oPosition.x + ", " + oPosition.y + ", " + oPosition.z );
LogMessage( "Tan U: " + oUTangent.x + ", " + oUTangent.y + ", " + oUTangent.z );
LogMessage( "Tan V: " + oVTangent .x + ", " + oVTangent .y + ", " + oVTangent .z );
LogMessage( "Normal: " + oNormal.x + ", " + oNormal.y + ", " + oNormal.z );
//--------------------------------------------------
// Output of above script:
//INFO : "Position: -4.718447854656915e-16, -2.828427124746189, 2.8284271247461916"
//INFO : "Tan U: 1, 0, 1.8784326741201244e-16"
//INFO : "Tan V: -5.3007381947367376e-17, 0.706986783671791, 0.7072267583409271"
//INFO : "Normal: -1.3280270746201882e-16, -0.7072267583409272, 0.7069867836717909"
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