AS3-建立在三维空间中随机加入影片箱路径(AS3- create a loopable rando

我想通过填充查找表与3D点（矢量3D来优化3D演示http://help.adobe.com/en_US/FlashPlatform/reference/actionscript/3/flash/geom/Vector3D.html ），我然后将访问以后。

这些3D点将定义在三维空间中随机和路径加入影片箱。

有谁知道实现这一目标的一种方式？

我想修改使用GreenSock贝塞尔补间创建3D空间中的贝塞尔，然后以某种方式抓住导致吐温的XYZ值。

好吧，你需要做两件事情：

从创建几个片段成环的3D三次Bezier曲线
创建，将你的对象作为一个目标，你的贝塞尔环路的路径和您的总循环时间的自定义补间功能。

您三次Bezier曲线的一个片段将始终以4个顶点，一个完整的循环必须包含至少2段，所以你需要随机创造至少7个顶点。顶点的数量始终是3 * NumberOfSegments + 1 ，但我们将只存储3 * NumberOfSegments作为第一个顶点将等于最后一个

最简单的情况下（2个段，6个顶点）：

...
private function generateRandomPoints():Vector<Vector3D>
{
    var resultingVector:Vector<Vector3D> = new Vector<Vector3D>();
    for(var i:int = 0; i < 6; i++)
    {
        var x:Number = Math.random() * 10;
        var y:Number = Math.random() * 10;
        var z:Number = Math.random() * 10;
        var currentPoint3D:Vector3D = new Vector3D(x, y, z);
        resultingVector.push(currentPoint3D);
    }
    return resultingVector;
}
...

现在，当我们有我们的道路上，我们可以分析它来获得这种渐变效果。您可以调用这个函数每次你需要新坐标（但你需要在一些地方保存你的初始时间），或创建一个中间人的对象将处理你的一切。我会告诉最基本的例子 - 自治功能：

public static function getNextCoordinates(loopStartTime:int, totalLoopTime:int, path:Vector.<Vector3D>):Vector3D
    {
        var resultingPoint:Vector3D = new Vector3D();
        var passedTime:int = getTimer() - loopStartTime;

        //Total passed ratio
        var passedRatio:Number = passedTime / totalLoopTime;
        var totalSegments:int = path.length / 3;

        var totalTimePerSegment:Number = totalLoopTime / totalSegments;

        //So it can loop forever
        while (passedRatio > 1)
        {
            passedRatio -= 1;
        }
        //Let's find our current bezier curve segment number
        var currentSegment:int = Math.floor( passedRatio * totalSegments);
        var currentSegmentRatio:Number = (passedTime - currentSegment * totalTimePerSegment) / totalTimePerSegment;
        //It can be optimized here
        while (currentSegmentRatio > 1)
        {
            currentSegmentRatio -= 1;
        }

        var startingIndex:int = currentSegment * 3;
        //our four path vertices
        var point0:Vector3D = path[startingIndex];
        var point1:Vector3D = path[startingIndex + 1];
        var point2:Vector3D = path[startingIndex + 2];

        //if it's a last segment, we need to "connect" to the first vertex
        if (startingIndex + 3 >= path.length)
        {
            var point3:Vector3D = path[0];
        }
        else
        {
            point3 = path[startingIndex + 3];
        }
        //At last, we find our coordinates
        var tempRatio:Number = 1 - currentSegmentRatio;
        resultingPoint.x = tempRatio * tempRatio * tempRatio * point0.x + 3 * tempRatio * tempRatio * currentSegmentRatio * point1.x + 3 * tempRatio * currentSegmentRatio * currentSegmentRatio * point2.x + currentSegmentRatio * currentSegmentRatio * currentSegmentRatio * point3.x;
        resultingPoint.y = tempRatio * tempRatio * tempRatio * point0.y + 3 * tempRatio * tempRatio * currentSegmentRatio * point1.y + 3 * tempRatio * currentSegmentRatio * currentSegmentRatio * point2.y + currentSegmentRatio * currentSegmentRatio * currentSegmentRatio * point3.y;
        resultingPoint.z = tempRatio * tempRatio * tempRatio * point0.z + 3 * tempRatio * tempRatio * currentSegmentRatio * point1.z + 3 * tempRatio * currentSegmentRatio * currentSegmentRatio * point2.z + currentSegmentRatio * currentSegmentRatio * currentSegmentRatio * point3.z;

        return resultingPoint;
    }

您可以扩展这个功能是补间对象的一部分。我在二维空间的测试，它完美的循环沿随机多段Bezier曲线精灵的运动

干杯!