## NurbsSurface.GetTrim2

### Description

Returns a complete data description of a nurbs surface trim. A trim is a nurbs curve list that is projected on a nurbs surface. The data is returned in a 1-dimension array and is ordered the same as for the NurbsSurface.GetTrim method output arguments.
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.

### C# Syntax

    Object NurbsSurface.GetTrim2( Int32 in_nTrimIndex, siNurbsFormat in_eNurbsFormat );

### Scripting Syntax

    oArray = NurbsSurface.GetTrim2( TrimIndex, [NurbsFormat] );

### Return Value

Array of values ordered as IsBoundary, ProjectionType, Count, ControlPoints, NbControlPoints, Knots, NbKnots, Closed, Degree, Parameterization

### Parameters

Parameter | Type | Description
--- | --- | ---
TrimIndex | Long | Specifies which trim must be described.
NurbsFormat | siNurbsFormat | Specifies how the data is formatted. Default Value: siSINurbs

### Examples

#### JScript Example

    // JScript example : shows how to retrieve the output arguments returned by NurbsSurface.GetTrim2
    // Create a sphere with some trims first
    CreatePrim("Sphere", "NurbsSurface", null, null);
    CreatePrim("Square", "NurbsCurve", null, null);
    Scale(null, -0.325581395348837, 1, 1, siRelative, siLocal, siObj, siXYZ, null, null, null, null, null, null, null, 0);
    Scale(null, 1, 0.732558139534884, 1, siRelative, siLocal, siObj, siXYZ, null, null, null, null, null, null, null, 0);
    SelectObj("sphere", null, true);
    ApplyTopoOp("TrimByProjection", "sphere;square", 3, siPersistentOperation, null);
    // get the trimmed surface
    var surfs = Application.Selection(0).ActivePrimitive.Geometry.Surfaces;
    // get the first trim parameters and convert VB array to JScript array
    var vbArgs = new VBArray(surfs(0).GetTrim2( 0, siSINurbs ));
    var args = vbArgs.toArray();
    // get the bondary flag of curves
    LogMessage("trim is boundary?: " + args[0] );
    // get the projection type
    LogMessage("projection type: " + args[1] );
    // get the number of curves
    LogMessage("number of curves: " + args[2] );
    // get the number of control points per curve
    var vbArg4 = new VBArray(args[4]);
    var ncpoints = vbArg4.toArray();
    for (i = 0; i < args[2]; i++)
    {
            LogMessage("number of control points for curve " + i + ": " + ncpoints[i] );
    }
    // get the control points
    var vbArg3 = new VBArray(args[3]);
    var cpts = vbArg3.toArray();
    for ( i=0; i<ncpoints.length; i++ )
    {
            for ( j=0, k=0; k<ncpoints[i]; k++, j+=4 )
            {
                    LogMessage("crv" + i + "[" + k + "]: " + cpts[j] + ", " + cpts[j+1] + ", " + cpts[j+2] + ", " + cpts[j+3] );
            }
    }
    // get the number knots per curve
    var vbArg6 = new VBArray(args[6]);
    var nknots = vbArg6.toArray();
    for (i = 0; i < nknots.length; i++)
    {
            LogMessage("number of knots for curve " + i + ": " + nknots[i] );
    }
    // get the knots
    var vbArg5 = new VBArray(args[5]);
    var knots = vbArg5.toArray();
    for ( j=0; j<nknots.length; j++)
    {
            for (i = 0; i < nknots[j]; i++)
            {
                    LogMessage("crv" + j + ": " + "knots" + i + ": " + knots[i] );
            }
    }
    // get nurbs curves closeness state
    var vbArg7 = new VBArray(args[7]);
    var closes = vbArg7.toArray();
    for (i = 0; i < closes.length; i++)
    {
            LogMessage("curve" + i + " closeness: " + closes[i] );
    }
    // get nurbs degree
    var vbArg8 = new VBArray(args[8]);
    var degrees = vbArg8.toArray();
    for (i = 0; i < degrees.length; i++)
    {
            LogMessage("curve" + i + " degree: " + degrees[i] );
    }
    // get nurbs parameterization factor
    var vbArg9 = new VBArray(args[9]);
    var params = vbArg9.toArray();
    for (i = 0; i < params.length; i++)
    {
            LogMessage("curve" + i + " parameterization: " + params[i] );
    }

### See Also

NurbsSurfaceMesh.AddSurfaceWithTrim NurbsSurface.GetTrim NurbsSurface.TrimCount