带有贝塞尔曲线的 SCNShape [英] SCNShape with bezier path

问题描述

我想在 Scenekit iOS 中绘制 3d 线，我正在尝试使用下面的代码来绘制线，

I am tying to draw a 3d line in Scenekit iOS, i am trying below code to draw line,

func path() -> UIBezierPath
    {
        var bPath = UIBezierPath()
        bPath.moveToPoint(CGPointMake(0, 0))
        bPath.addLineToPoint(CGPointMake(10, 10))
        bPath.addLineToPoint(CGPointMake(5, 5))
        bPath.closePath()
        return bPath
    }

下面的代码是在SCNNode中加载该行，

and the below code is to load the line in SCNNode,

let sap = SCNShape()
    sap.path = path()
    let carbonNode = SCNNode(geometry: sap)
    carbonNode.position = SCNVector3Make(0, 0, 15)
    scene.rootNode.addChildNode(carbonNode)

但是，我的屏幕一片空白.

But, i am getting blank screen.

推荐答案

尝试更改几何体的材质.您可能有一个白色背景上的白色物体.

try changing your geometry's materials. You might have a white object on a white background.

事实证明，三角形的顶点是共线的.因此，您最终会得到一个退化三角形.

edit: it also turns out that the vertices of your triangle are colinear. You thus end up with a degenerate triangle.

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