39 lines
1.2 KiB
JavaScript
39 lines
1.2 KiB
JavaScript
/**************************************************************
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* Closed Spline 3D curve
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**************************************************************/
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THREE.ClosedSplineCurve3 = THREE.Curve.create(
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function ( points /* array of Vector3 */) {
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this.points = ( points == undefined ) ? [] : points;
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},
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function ( t ) {
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var points = this.points;
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var point = ( points.length - 0 ) * t; // This needs to be from 0-length +1
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var intPoint = Math.floor( point );
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var weight = point - intPoint;
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intPoint += intPoint > 0 ? 0 : ( Math.floor( Math.abs( intPoint ) / points.length ) + 1 ) * points.length;
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var point0 = points[ ( intPoint - 1 ) % points.length ];
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var point1 = points[ ( intPoint ) % points.length ];
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var point2 = points[ ( intPoint + 1 ) % points.length ];
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var point3 = points[ ( intPoint + 2 ) % points.length ];
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var vector = new THREE.Vector3();
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vector.x = THREE.Curve.Utils.interpolate( point0.x, point1.x, point2.x, point3.x, weight );
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vector.y = THREE.Curve.Utils.interpolate( point0.y, point1.y, point2.y, point3.y, weight );
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vector.z = THREE.Curve.Utils.interpolate( point0.z, point1.z, point2.z, point3.z, weight );
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return vector;
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}
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);
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