我有2个锚点,我想在一个锚点处绘制一个箭头对象,并在另一个锚点处绘制箭头的方向。我输入了一些代码,但无法正常工作]
private void drawLine(AnchorNode node1, AnchorNode node2) {
Vector3 point1, point2;
point1 = node1.getWorldPosition();
point2 = node2.getWorldPosition();
node1.setParent(mArFragment.getArSceneView().getScene());
//find the vector extending between the two points and define a look rotation
//in terms of this Vector.
final Vector3 difference = Vector3.subtract(point1, point2);
final Vector3 directionFromTopToBottom = difference.normalized();
final Quaternion rotationFromAToB =
Quaternion.lookRotation(directionFromTopToBottom, Vector3.up());
MaterialFactory.makeTransparentWithColor(getApplicationContext(), new Color(247, 181, 0, 0.7f))
.thenAccept(
material -> {
// create a rectangular prism, using ShapeFactory.makeCube()
// use the difference vector to extend to the necessary length
ModelRenderable model = ShapeFactory.makeCube(
new Vector3(.15f, .001f, difference.length()),
Vector3.zero(), material);
// set the world rotation of the node to the rotation calculated earlier
// and set the world position to the midpoint between the given points
Node nodeForLine = new Node();
nodeForLine.setParent(node1);
nodeForLine.setRenderable(model);
nodeForLine.setWorldPosition(Vector3.add(point1, point2).scaled(.5f));
nodeForLine.setWorldRotation(rotationFromAToB);
}
); // end rendering
ModelRenderable.builder()
.setSource(this, Uri.parse("model.sfb"))
.build()
.thenAccept(modelRenderable -> {
AnchorNode anchorNode = new AnchorNode(node1.getAnchor());
TransformableNode transformableNode = new TransformableNode(mArFragment.getTransformationSystem());
transformableNode.setParent(anchorNode);
transformableNode.setRenderable(modelRenderable);
transformableNode.setWorldRotation(rotationFromAToB);
mArFragment.getArSceneView().getScene().addChild(anchorNode);
transformableNode.select();
})
.exceptionally(throwable -> {
AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setMessage(throwable.getMessage()).show();
return null;
});
}
您看到箭头已渲染,但方向不正确。Current situation. See image
[我认为您希望一个锚点上的箭头指向另一个锚点-您可以使用'setLookDirection'和一个TransformableNode来做到这一点。
请参见下面的示例:
var newAnchorNode:AnchorNode = AnchorNode(newAnchor)
var transNode = TransformableNode(arFragment.transformationSystem)
transNode.setLookDirection(Vector3(0f, 1f, 1f), Vector3.left())
transNode.renderable = selectedRenderable
transNode.setParent(newAnchorNode)
newAnchorNode.setParent(arFragment.arSceneView.scene)
您可以将自己的值用于两个vector3。稍后我将更新方法说明(目前ARCore的文档链接似乎断开了),但是第一个Vector3是您希望可渲染对象“查看”的点,在这种情况下,另一个锚点很可能是第二个; Vector3是场景中可渲染对象的方向-即,如果要使其垂直,面向左等。
需要注意的一点,AFAIK,Sceeform仍然是为横向模式设计的,因此如果不使用横向模式,则可能需要尝试以所需的方式获取方向-例如,上例中的vector3.left()是为了使可渲染对象在人像显示器上直立显示。