Question

我正在使用ARKit和SceneKit进行透视测试。这个想法是在地面上显示平面3D模型时改善3D渲染。我已经打开了另一个即将解决的透视问题的门票。（ARKit Perspective Rendering）

但是，在进行大量测试/ 3D显示后，我发现有时锚定3D模型时，其大小可能会有所不同...（宽度和长度）我通常会显示一个16米长，1.5米宽的3D模型。您完全可以想象这会扭曲我的渲染。我不知道为什么我的显示器在3D模型大小方面可能会有所不同。也许是来自跟踪和我的测试环境。

下面是我用于将3D模型添加到场景中的代码：

func renderer(_ renderer: SCNSceneRenderer, didAdd node: SCNNode, for anchor: ARAnchor) {
    guard let imageAnchor = anchor as? ARImageAnchor else { return }
    let referenceImage = imageAnchor.referenceImage
    let imageAnchorPosition = imageAnchor.transform.columns.3
    print("Image detected")

    let modelName = "couloirV2"
    //let modelName = "lamp"
    guard let object = VirtualObject
        .availableObjects
        .filter({ $0.modelName == modelName })
        .first else { fatalError("Cannot get model \(modelName)") }

    print("Loading \(object)...")

    self.sceneView.prepare([object], completionHandler: { _ in
        self.updateQueue.async {
            // Translate the object's position to the reference node position.
            object.position.x = imageAnchorPosition.x
            object.position.y = imageAnchorPosition.y
            object.position.z = imageAnchorPosition.z

            // Save the initial y value for slider handler function
            self.tmpYPosition = object.position.y

            // Match y node's orientation
            object.orientation.y = node.orientation.y
            print("Adding object to the scene")

            // Prepare the object
            object.load()

            // Show origin axis
            object.showObjectOrigin()


            // Translate on z axis to match perfectly with image detected.
            var translation = matrix_identity_float4x4
            translation.columns.3.z += Float(referenceImage.physicalSize.height / 2)
            object.simdTransform = matrix_multiply(object.simdTransform, translation)

            self.sceneView.scene.rootNode.addChildNode(object)
            self.virtualObjectInteraction.selectedObject = object
            self.sceneView.addOrUpdateAnchor(for: object)
        }
    })
}

缩放比例不好，渲染ARKit

0 个答案: