public override void DidAddNode(ISCNSceneRenderer renderer, SCNNode node, ARAnchor anchor)
{
if (anchor != null && anchor is ARImageAnchor)
{
var imageAnchor = anchor as ARImageAnchor;
var referenceImage = imageAnchor.ReferenceImage;
var imageWidth = referenceImage.PhysicalSize.Width;
var imageHeight = referenceImage.PhysicalSize.Height;
var verticesArray = new List <SCNVector3>()
{
new SCNVector3((float)-imageWidth / 2, 0, (float)-imageHeight / 2),
new SCNVector3((float)-imageWidth / 2, 0, (float)imageHeight / 2),
new SCNVector3((float)imageWidth / 2, 0, (float)-imageHeight / 2),
new SCNVector3((float)imageWidth / 2, 0, (float)imageHeight / 2),
};
foreach (var v in verticesArray)
{
var sphere = new SCNNode();
sphere.Geometry = SCNSphere.Create(new nfloat(0.0025));
sphere.Geometry.FirstMaterial.Diffuse.Contents = UIColor.Red;
sphere.Geometry.FirstMaterial.Emission.Contents = UIColor.Blue;
sphere.Position = v;
node.Add(sphere);
// Create a plane to visualize the initial position of the detected image.
var plane = SCNPlane.Create(imageWidth, imageHeight);
var planeNode = SCNNode.Create();
planeNode.Name = "Unicorn";
planeNode.Geometry = plane;
planeNode.Geometry.FirstMaterial.Diffuse.Contents = UIColor.Blue;
planeNode.Opacity = new nfloat(0);
/*
* `SCNPlane` is vertically oriented in its local coordinate space, but
* `ARImageAnchor` assumes the image is horizontal in its local space, so
* rotate the plane to match.
*/
var EulerY = planeNode.EulerAngles.Y;
var EulerZ = planeNode.EulerAngles.Z;
planeNode.EulerAngles = new SCNVector3((float)-3.1416 / 2, EulerY, EulerZ);
node.Add(planeNode);
// Create a box to visualize the initial position of the detected image.
var box = SCNBox.Create(imageWidth, 0.005f, imageHeight, 0);
var opaqueMat = new SCNMaterial();
opaqueMat.Diffuse.ContentColor = UIColor.Red;
opaqueMat.DoubleSided = true;
var transMat = new SCNMaterial();
opaqueMat.Diffuse.ContentColor = UIColor.Purple;
transMat.Transparency = 0;
var boxNode = new SCNNode {
Position = new SCNVector3(0, 0, 0), Geometry = box
};
boxNode.Geometry.Materials = new SCNMaterial[] { opaqueMat, opaqueMat, opaqueMat, opaqueMat, transMat, transMat };
EulerY = boxNode.EulerAngles.Y;
EulerZ = boxNode.EulerAngles.Z;
//boxNode.EulerAngles = new SCNVector3(-3.1416f / 2, EulerY, EulerZ);
node.Add(boxNode);
}
}
}