Question

我有两个向量作为输入，我试图在它们之间创建一个圆柱体。但是，当我的点的x和z坐标相同且y坐标不同时，这会失败

我有以下功能：

ubuntu 18.04

}

当两个点的x，z坐标相同但y坐标完全不同时，我仍然不确定它失败的原因。

如果有人能解释我，我会很高兴。

先谢谢。

Answer 1

查看你的代码，看起来非常复杂，可以用很少的代码实现。

此代码可与SCNBox或SCNCylinder几何图形一起使用。

class MeasuringLineNode: SCNNode{

init(startingVector vectorA: GLKVector3, endingVector vectorB: GLKVector3) {
    super.init()

    //1. Create The Height Our Box Which Is The Distance Between Our 2 Vectors
    let height = CGFloat(GLKVector3Distance(vectorA, vectorB))

    //2. Set The Nodes Position At The Same Position As The Starting Vector
    self.position = SCNVector3(vectorA.x, vectorA.y, vectorA.z)

    //3. Create A Second Node Which Is Placed At The Ending Vectors Posirions
    let nodeVectorTwo = SCNNode()
    nodeVectorTwo.position = SCNVector3(vectorB.x, vectorB.y, vectorB.z)

    //4. Create An SCNNode For Alignment Purposes At 90 Degrees
    let nodeZAlign = SCNNode()
    nodeZAlign.eulerAngles.x = Float.pi/2

    //5. Create An SCNCyclinder Geometry To Act As Our Line
    let cylinder = SCNCylinder(radius: 0.001, height: height)
    let material = SCNMaterial()
    material.diffuse.contents = UIColor.white
    cylinder.materials = [material]

    /*
     If you want to use an SCNBox then use the following:

     let box = SCNBox(width: 0.001, height: height, length: 0.001, chamferRadius: 0)
     let material = SCNMaterial()
     material.diffuse.contents = UIColor.white
     box.materials = [material]

    */

    //6. Create The LineNode Centering On The Alignment Node
    let nodeLine = SCNNode(geometry: cylinder)
    nodeLine.position.y = Float(-height/2)
    nodeZAlign.addChildNode(nodeLine)

    self.addChildNode(nodeZAlign)

    //7. Force The Node To Look At Our End Vector
    self.constraints = [SCNLookAtConstraint(target: nodeVectorTwo)]
}

required init?(coder aDecoder: NSCoder) { fatalError("init(coder:) has not been implemented") }
}

假设您有2个SCNNodes（在我的示例中，我将简单地称为nodeA和nodeB），您可以创建一个连接线，如下所示：

//1. Convert The Nodes SCNVector3 to GLVector3
let nodeAVector3 = GLKVector3Make(nodeA.position.x, nodeA.position.y, nodeA.position.z)
let nodeBVector3 = GLKVector3Make(nodeB.position.x, nodeB.position.y, nodeB.position.z)

//2. Draw A Line Between The Nodes
let line = MeasuringLineNode(startingVector: nodeAVector3 , endingVector: nodeBVector3)
self.augmentedRealityView.scene.rootNode.addChildNode(line)

希望这会有所帮助......

无法在某些情况下创建气缸 - Arkit

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