Question

使用ARKit我可以点击曲面以在此处放置3D对象。我也可以移动手指，从而沿着表面移动物体。

如何让对象自动显示并粘贴在相机前面的表面，而无需触摸屏幕？

以下是通过手指点击放置3D对象的示例脚本：

using System;
using System.Collections.Generic;

namespace UnityEngine.XR.iOS
{
    public class UnityARHitTestExample : MonoBehaviour
    {
        public Transform m_HitTransform;

        bool HitTestWithResultType (ARPoint point, ARHitTestResultType resultTypes)
        {
            List<ARHitTestResult> hitResults = UnityARSessionNativeInterface.GetARSessionNativeInterface ().HitTest (point, resultTypes);
            if (hitResults.Count > 0) {
                foreach (var hitResult in hitResults) {
                    Debug.Log ("Got hit!");
                    m_HitTransform.position = UnityARMatrixOps.GetPosition (hitResult.worldTransform);
                    m_HitTransform.rotation = UnityARMatrixOps.GetRotation (hitResult.worldTransform);
                    Debug.Log (string.Format ("x:{0:0.######} y:{1:0.######} z:{2:0.######}", m_HitTransform.position.x, m_HitTransform.position.y, m_HitTransform.position.z));
                    return true;
                }
            }
            return false;
        }

        // Update is called once per frame
        void Update () {
            if (Input.touchCount > 0 && m_HitTransform != null)
            {
                var touch = Input.GetTouch(0);
                if (touch.phase == TouchPhase.Began || touch.phase == TouchPhase.Moved)
                {
                    var screenPosition = Camera.main.ScreenToViewportPoint(touch.position);
                    ARPoint point = new ARPoint {
                        x = screenPosition.x,
                        y = screenPosition.y
                    };

                    // prioritize reults types
                    ARHitTestResultType[] resultTypes = {
                        ARHitTestResultType.ARHitTestResultTypeExistingPlaneUsingExtent, 
                        // if you want to use infinite planes use this:
                        //ARHitTestResultType.ARHitTestResultTypeExistingPlane,
                        ARHitTestResultType.ARHitTestResultTypeHorizontalPlane, 
                        ARHitTestResultType.ARHitTestResultTypeFeaturePoint
                    }; 

                    foreach (ARHitTestResultType resultType in resultTypes)
                    {
                        if (HitTestWithResultType (point, resultType))
                        {
                            return;
                        }
                    }
                }
            }
        }


    }
}

Answer 1

我在Objective-C中做过类似的事情，所以希望我可以帮助你的团结榜样。

我的逻辑基本上是使用tap来放置对象是基于hitTest函数，并且从触摸位置提取了一个点。所以我只是在屏幕中心以编程方式创建了CGPoint，并使用此点运行了hitTest函数。它是否挂钩到一个计时器，并在那里添加了一个命中返回的对象。

CGPoint point = CGPointMake(self.sceneView.frame.size.width / 2, self.sceneView.frame.size.height / 2); //Get a point at the middle of the screen
NSArray <ARHitTestResult *> *hitResults = [_sceneView hitTest:point types:ARHitTestResultTypeFeaturePoint]; //Try to do a AR Hit Test on this point
if ([hitResults count] != 0) { //If have any results
    //Perform desired operation
}

ARKit - 放置对象而不触摸屏幕

1 个答案: