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ConstructPointLocators (NurbsSurfaceMesh) *

Introduced

5.0

Description

Builds a PointLocatorData from NurbsSurfaceMesh-specific topological information. Subsurface indices and normalized UV surface parameters are required in order to define each point locator. The UV array should contain two values for each specified subsurface index.

Notice that the returned point locators can be evaluated on any NurbsSurfaceMesh instance having the same topology.

Scripting Syntax

NurbsSurfaceMesh.ConstructPointLocators( SubSurfaceIndices, NormalizedUVs )

C# Syntax

PointLocatorData NurbsSurfaceMesh.ConstructPointLocators( Object in_pSubSurfaceIndices, Object in_pNormalizedUVs );

Parameters

Return Value

PointLocatorData

Examples

JScript Example

/*
   This example creates point locators at random surface locations,
   and positions a Null at each of these point locators.
*/

NewScene( null, false );
var root = Application.ActiveSceneRoot;
var SphereGeom = root.AddGeometry("Sphere", "NurbsSurface").ActivePrimitive.Geometry;

var NbPtLocators = 50;

var SubSurfaceArray = new Array(NbPtLocators);
var UVArray = new Array(NbPtLocators*2);

for(i = 0; i < NbPtLocators; i++)
{
   SubSurfaceArray[i] = 0;
   UVArray[i*2] = Math.random();
   UVArray[i*2+1] = Math.random();
}

var PointLocatorsFromRandomUVs = SphereGeom.ConstructPointLocators(SubSurfaceArray, UVArray);

CreateNullsAtPointLocations(SphereGeom, PointLocatorsFromRandomUVs);


function CreateNullsAtPointLocations( InGeom, InPointLocators )
{
   var SpherePositions = InGeom.EvaluatePositions(InPointLocators).toArray();
   var SphereNormals = InGeom.EvaluateNormals(InPointLocators).toArray();

   var TempVector = XSIMath.CreateVector3();
   var TempRotation = XSIMath.CreateRotation();

   for (i = 0; i < SpherePositions.length; i+=3)
   {
       var NullObj = root.AddNull();

       TempVector.Set(SpherePositions[i], SpherePositions[i+1], SpherePositions[i+2]);
       NullObj.LocalTranslation = TempVector;

       TempVector.Set(SphereNormals[i], SphereNormals[i+1], SphereNormals[i+2]);

       TempRotation.SetFromXYZAxes( TempVector, TempVector, TempVector );
       NullObj.LocalRotation = TempRotation;
   }
}

See Also

Autodesk Softimage v7.5     <     >