2024-12-28WPF Viewport3D Model3DGroup GeometryModel3D ModelVisual3D PerspectiveCamera DirectionalLight MeshGe Vector3DCollectionPoint3DCollectionPointCollectionInt32CollectionLinearGradientBrushDiffuseMaterial RotateTransform3DAxisAngleRotation3D usingSystem;usingSystem.Collections.Generic;usingSystem.Linq;usingSystem.Text;usingSystem.Threadi