scenekit-放大/缩小到场景的选定节点

要在Z轴上重新定位,需要将当前节点矩阵与新矩阵相乘。

var node = childNode.transform
var translation = SCNMatrix4MakeTranslation(1.0, 1.0, adjustedZValue)
var newTrans = SCNMatrix4Mult(node, translation)
childNode.transform = newTrans

编辑:有些名字混淆了

我通过移动相机而不是缩放模型来解决问题。我通过手势识别器得到了轻触点,同样也得到了触摸点。

现在,我将视图坐标转换为场景坐标

CGPoint p = [gestureRecognize locationInView:scnView];

    NSArray *hitResults = [scnView hitTest:p options:nil];

    SCNVector3 projectedOrigin = [scnView projectPoint:SCNVector3Zero];

    SCNVector3 vector = SCNVector3Make(p.x, p.y, projectedOrigin.z);

    SCNVector3 worldPoint = [scnView unprojectPoint:vector];

然后将相机定位到世界点。

稍微清理一下,更“快速”:

let transform = childNode.transform
let adjustedZValue = Float32(3)
let translation = SCNMatrix4MakeTranslation(1.0, 1.0, adjustedZValue)
let newTrans = SCNMatrix4Mult(transform, translation)
childNode.transform = newTrans