Hi, i want to place a object in 3d world space without the use of hittest or plane detection in ios swift code. Suggest the best method. Now, I take the camera center matrix and use simd_mul to place the object, it works but the object gets placed at the centre of the mobile screen. I want to select the x and y positino on the screen 2d coordinate and place the object. I tried using the unprojectpoint function, to get the AR scene world coordinate of the point i touch on the mobile screen. I get the x, y,z values, they are very close to the values from camera center matrix. When i try to replace the unprojectpoint values in the cameracenter matrix, i dont see a difference in the location of the placed object. The below code always place object from center screen with specified depth, But i need to place object in user specified position(x,y) of the screen with depth. 2D pixel coordinate system of the renderer to the 3D world coordinate system of the scene. /* Create a transform with a translation of 0.2 meters in front of the camera. */ var translation = matrix_identity_float4x4 translation.columns.3.z = -0.2 let transform = simd_mul(view.session.currentFrame.camera.transform, translation) Refer from : [https://developer.apple.com/documentation/arkit/arskview/providing_2d_virtual_content_with_spritekit) The code i used for replacing the camera center matrix with the unprojectpoint is let vpWithZ = SCNVector3(x: 100.0, y: 100.0, z: -1.0) let worldPoint = sceneView.unprojectPoint(vpWithZ) var translation = matrix_identity_float4x4 translation.columns.3.z = Float(Depth) var translation2 = sceneView.session.currentFrame!.camera.transform translation2.columns.3.x = worldPoint.x translation2.columns.3.y = worldPoint.y translation2.columns.3.z = worldPoint.z let new_transform = simd_mul(translation2, translation) /* add object name you wanted in your project*/ let sphere = SCNSphere(radius: 0.03) let objectNode = SCNNode(geometry: sphere) objectNode.position = SCNVector3(x: transform.columns.3.x, y: transform.columns.3.y, z: transform.columns.3.z) The below image shows outline of my idea.