在垂直平面上添加的对象始终在 ARCore 中旋转 [英] Added object on vertical plane always rotated in ARCore

问题描述

我在 Sceneform ARFragment 的垂直平面上添加图像.但它总是会旋转.该代码在水平面上运行良好.我在垂直平面上放置图像的代码如下:

I am adding an image on vertical plane in Sceneform ARFragment. But it always get rotated. The code is working fine on horizontal plane. My code for placing images on vertical Plane is as follow:

arFragment.setOnTapArPlaneListener { hitResult: HitResult, 
                                         plane: Plane, 
                                   motionEvent: MotionEvent ->

    if(!isOnceTapedOnSurface) {
        val anchor = hitResult.createAnchor()
        val anchorNode = AnchorNode(anchor)
        anchorNode.setParent(arFragment.arSceneView.scene)

        andy = TransformableNode(arFragment.transformationSystem)

        if(plane.type == Plane.Type.VERTICAL) {
            val anchorUp = anchorNode.up
            andy.setLookDirection(Vector3.up(), anchorUp)
        }

        andy.setParent(anchorNode)
        andy.renderable = andyRenderable
        andy.select()

        // arFragment.arSceneView.planeRenderer.isVisible = false
        isOnceTapedOnSurface = true
    }
}

推荐答案

要解决此问题，您可以使用上述解决方案.但是您应该使用世界旋转来旋转对象.不要使用本地轮换.我们需要将旋转值归零.如果您使用局部旋转，对象将表现锚(父)旋转.所以通过使用世界旋转我们可以控制对象.

To fix this issue you can use the above solution. But you should rotate an object using world rotation. Don't use local rotation. We need to zero the rotation value. If you are using local rotation, the object will behave anchor(parent) rotation. So by using world rotation we can control the object.

String planeType = "";

//点击表面时可以获得锚点方向

//When tapping on the surface you can get the anchor orientation

if (plane.getType() == Plane.Type.VERTICAL){
                planeType = "Vertical";
            }else if (plane.getType() == Plane.Type.HORIZONTAL_UPWARD_FACING){
                planeType = "Horizontal_Upward";
            }else if (plane.getType() == Plane.Type.HORIZONTAL_DOWNWARD_FACING){
                planeType = "Horizontal_Downward";
            }else {
                planeType = "Horizontal";
            }```


// First set object world rotation zero

transformableNode.setWorldRotation(Quaternion.axisAngle(new Vector3(0, 0f, 0), 0));


// check plane type is vertical or horizontal if it is vertical below logic will work.

if (planeType.equals("Vertical")) {

   Vector3 anchorUp = anchorNode.getUp();
   transformableNode.setLookDirection(Vector3.up(), anchorUp);

}

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