Procedura: Creare una scena 3D
In questo esempio viene illustrato come creare un oggetto 3D simile a un foglio di carta piatto ruotato. Un Viewport3D insieme ai componenti seguenti viene usato per creare questa semplice scena 3D:
Una fotocamera viene creata usando un oggetto PerspectiveCamera. La fotocamera specifica quale parte della scena 3D è visualizzabile.
Viene creata una mesh per specificare la forma dell'oggetto 3D (foglio di carta) utilizzando la Geometry proprietà di GeometryModel3D.
Viene specificato un materiale da visualizzare sulla superficie dell'oggetto (sfumatura lineare in questo esempio) usando la Material proprietà di GeometryModel3D.
Viene creata una luce per brillare sull'oggetto utilizzando DirectionalLight.
Creare una scena 3D in XAML
Il codice seguente illustra come creare una scena 3D in XAML.
<Page xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" >
<DockPanel>
<Viewbox>
<Canvas Width="321" Height="201">
<!-- The Viewport3D provides a rendering surface for 3-D visual content. -->
<Viewport3D ClipToBounds="True" Width="150" Height="150" Canvas.Left="0" Canvas.Top="10">
<!-- Defines the camera used to view the 3D object. -->
<Viewport3D.Camera>
<PerspectiveCamera Position="0,0,2" LookDirection="0,0,-1" FieldOfView="60" />
</Viewport3D.Camera>
<!-- The ModelVisual3D children contain the 3D models -->
<Viewport3D.Children>
<!-- This ModelVisual3D defines the light cast in the scene. Without light, the 3D
object cannot be seen. Also, the direction of the lights affect shadowing. If desired,
you can create multiple lights with different colors that shine from different directions. -->
<ModelVisual3D>
<ModelVisual3D.Content>
<DirectionalLight Color="#FFFFFF" Direction="-0.612372,-0.5,-0.612372" />
</ModelVisual3D.Content>
</ModelVisual3D>
<ModelVisual3D>
<ModelVisual3D.Content>
<GeometryModel3D>
<!-- The geometry specifies the shape of the 3D plane. In this sample, a flat sheet is created. -->
<GeometryModel3D.Geometry>
<MeshGeometry3D
TriangleIndices="0,1,2 3,4,5 "
Normals="0,0,1 0,0,1 0,0,1 0,0,1 0,0,1 0,0,1 "
TextureCoordinates="0,0 1,0 1,1 1,1 0,1 0,0 "
Positions="-0.5,-0.5,0.5 0.5,-0.5,0.5 0.5,0.5,0.5 0.5,0.5,0.5 -0.5,0.5,0.5 -0.5,-0.5,0.5 " />
</GeometryModel3D.Geometry>
<!-- The material specifies the material applied to the 3D object. In this sample a linear gradient
covers the surface of the 3D object.-->
<GeometryModel3D.Material>
<MaterialGroup>
<DiffuseMaterial>
<DiffuseMaterial.Brush>
<LinearGradientBrush StartPoint="0,0.5" EndPoint="1,0.5">
<LinearGradientBrush.GradientStops>
<GradientStop Color="Yellow" Offset="0" />
<GradientStop Color="Red" Offset="0.25" />
<GradientStop Color="Blue" Offset="0.75" />
<GradientStop Color="LimeGreen" Offset="1" />
</LinearGradientBrush.GradientStops>
</LinearGradientBrush>
</DiffuseMaterial.Brush>
</DiffuseMaterial>
</MaterialGroup>
</GeometryModel3D.Material>
<!-- Apply a transform to the object. In this sample, a rotation transform is applied, rendering the
3D object rotated. -->
<GeometryModel3D.Transform>
<RotateTransform3D>
<RotateTransform3D.Rotation>
<AxisAngleRotation3D Axis="0,3,0" Angle="40" />
</RotateTransform3D.Rotation>
</RotateTransform3D>
</GeometryModel3D.Transform>
</GeometryModel3D>
</ModelVisual3D.Content>
</ModelVisual3D>
</Viewport3D.Children>
</Viewport3D>
</Canvas>
</Viewbox>
</DockPanel>
</Page>
Creare una scena 3D nel codice procedurale
Il codice seguente illustra come creare la stessa scena 3D nel codice procedurale.
using System;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Media;
using System.Windows.Media.Media3D;
namespace SDKSample
{
public partial class Basic3DShapeExample : Page
{
public Basic3DShapeExample()
{
// Declare scene objects.
Viewport3D myViewport3D = new Viewport3D();
Model3DGroup myModel3DGroup = new Model3DGroup();
GeometryModel3D myGeometryModel = new GeometryModel3D();
ModelVisual3D myModelVisual3D = new ModelVisual3D();
// Defines the camera used to view the 3D object. In order to view the 3D object,
// the camera must be positioned and pointed such that the object is within view
// of the camera.
PerspectiveCamera myPCamera = new PerspectiveCamera();
// Specify where in the 3D scene the camera is.
myPCamera.Position = new Point3D(0, 0, 2);
// Specify the direction that the camera is pointing.
myPCamera.LookDirection = new Vector3D(0, 0, -1);
// Define camera's horizontal field of view in degrees.
myPCamera.FieldOfView = 60;
// Asign the camera to the viewport
myViewport3D.Camera = myPCamera;
// Define the lights cast in the scene. Without light, the 3D object cannot
// be seen. Note: to illuminate an object from additional directions, create
// additional lights.
DirectionalLight myDirectionalLight = new DirectionalLight();
myDirectionalLight.Color = Colors.White;
myDirectionalLight.Direction = new Vector3D(-0.61, -0.5, -0.61);
myModel3DGroup.Children.Add(myDirectionalLight);
// The geometry specifes the shape of the 3D plane. In this sample, a flat sheet
// is created.
MeshGeometry3D myMeshGeometry3D = new MeshGeometry3D();
// Create a collection of normal vectors for the MeshGeometry3D.
Vector3DCollection myNormalCollection = new Vector3DCollection();
myNormalCollection.Add(new Vector3D(0,0,1));
myNormalCollection.Add(new Vector3D(0,0,1));
myNormalCollection.Add(new Vector3D(0,0,1));
myNormalCollection.Add(new Vector3D(0,0,1));
myNormalCollection.Add(new Vector3D(0,0,1));
myNormalCollection.Add(new Vector3D(0,0,1));
myMeshGeometry3D.Normals = myNormalCollection;
// Create a collection of vertex positions for the MeshGeometry3D.
Point3DCollection myPositionCollection = new Point3DCollection();
myPositionCollection.Add(new Point3D(-0.5, -0.5, 0.5));
myPositionCollection.Add(new Point3D(0.5, -0.5, 0.5));
myPositionCollection.Add(new Point3D(0.5, 0.5, 0.5));
myPositionCollection.Add(new Point3D(0.5, 0.5, 0.5));
myPositionCollection.Add(new Point3D(-0.5, 0.5, 0.5));
myPositionCollection.Add(new Point3D(-0.5, -0.5, 0.5));
myMeshGeometry3D.Positions = myPositionCollection;
// Create a collection of texture coordinates for the MeshGeometry3D.
PointCollection myTextureCoordinatesCollection = new PointCollection();
myTextureCoordinatesCollection.Add(new Point(0, 0));
myTextureCoordinatesCollection.Add(new Point(1, 0));
myTextureCoordinatesCollection.Add(new Point(1, 1));
myTextureCoordinatesCollection.Add(new Point(1, 1));
myTextureCoordinatesCollection.Add(new Point(0, 1));
myTextureCoordinatesCollection.Add(new Point(0, 0));
myMeshGeometry3D.TextureCoordinates = myTextureCoordinatesCollection;
// Create a collection of triangle indices for the MeshGeometry3D.
Int32Collection myTriangleIndicesCollection = new Int32Collection();
myTriangleIndicesCollection.Add(0);
myTriangleIndicesCollection.Add(1);
myTriangleIndicesCollection.Add(2);
myTriangleIndicesCollection.Add(3);
myTriangleIndicesCollection.Add(4);
myTriangleIndicesCollection.Add(5);
myMeshGeometry3D.TriangleIndices = myTriangleIndicesCollection;
// Apply the mesh to the geometry model.
myGeometryModel.Geometry = myMeshGeometry3D;
// The material specifies the material applied to the 3D object. In this sample a
// linear gradient covers the surface of the 3D object.
// Create a horizontal linear gradient with four stops.
LinearGradientBrush myHorizontalGradient = new LinearGradientBrush();
myHorizontalGradient.StartPoint = new Point(0, 0.5);
myHorizontalGradient.EndPoint = new Point(1, 0.5);
myHorizontalGradient.GradientStops.Add(new GradientStop(Colors.Yellow, 0.0));
myHorizontalGradient.GradientStops.Add(new GradientStop(Colors.Red, 0.25));
myHorizontalGradient.GradientStops.Add(new GradientStop(Colors.Blue, 0.75));
myHorizontalGradient.GradientStops.Add(new GradientStop(Colors.LimeGreen, 1.0));
// Define material and apply to the mesh geometries.
DiffuseMaterial myMaterial = new DiffuseMaterial(myHorizontalGradient);
myGeometryModel.Material = myMaterial;
// Apply a transform to the object. In this sample, a rotation transform is applied,
// rendering the 3D object rotated.
RotateTransform3D myRotateTransform3D = new RotateTransform3D();
AxisAngleRotation3D myAxisAngleRotation3d = new AxisAngleRotation3D();
myAxisAngleRotation3d.Axis = new Vector3D(0,3,0);
myAxisAngleRotation3d.Angle = 40;
myRotateTransform3D.Rotation = myAxisAngleRotation3d;
myGeometryModel.Transform = myRotateTransform3D;
// Add the geometry model to the model group.
myModel3DGroup.Children.Add(myGeometryModel);
// Add the group of models to the ModelVisual3d.
myModelVisual3D.Content = myModel3DGroup;
//
myViewport3D.Children.Add(myModelVisual3D);
// Apply the viewport to the page so it will be rendered.
this.Content = myViewport3D;
}
}
}
Imports System.Windows
Imports System.Windows.Controls
Imports System.Windows.Media
Imports System.Windows.Media.Media3D
Namespace SDKSample
Partial Public Class Basic3DShapeExample
Inherits Page
Public Sub New()
' Declare scene objects.
Dim myViewport3D As New Viewport3D()
Dim myModel3DGroup As New Model3DGroup()
Dim myGeometryModel As New GeometryModel3D()
Dim myModelVisual3D As New ModelVisual3D()
' Defines the camera used to view the 3D object. In order to view the 3D object,
' the camera must be positioned and pointed such that the object is within view
' of the camera.
Dim myPCamera As New PerspectiveCamera()
' Specify where in the 3D scene the camera is.
myPCamera.Position = New Point3D(0, 0, 2)
' Specify the direction that the camera is pointing.
myPCamera.LookDirection = New Vector3D(0, 0, -1)
' Define camera's horizontal field of view in degrees.
myPCamera.FieldOfView = 60
' Asign the camera to the viewport
myViewport3D.Camera = myPCamera
' Define the lights cast in the scene. Without light, the 3D object cannot
' be seen. Note: to illuminate an object from additional directions, create
' additional lights.
Dim myDirectionalLight As New DirectionalLight()
myDirectionalLight.Color = Colors.White
myDirectionalLight.Direction = New Vector3D(-0.61, -0.5, -0.61)
myModel3DGroup.Children.Add(myDirectionalLight)
' The geometry specifes the shape of the 3D plane. In this sample, a flat sheet
' is created.
Dim myMeshGeometry3D As New MeshGeometry3D()
' Create a collection of normal vectors for the MeshGeometry3D.
Dim myNormalCollection As New Vector3DCollection()
myNormalCollection.Add(New Vector3D(0,0,1))
myNormalCollection.Add(New Vector3D(0,0,1))
myNormalCollection.Add(New Vector3D(0,0,1))
myNormalCollection.Add(New Vector3D(0,0,1))
myNormalCollection.Add(New Vector3D(0,0,1))
myNormalCollection.Add(New Vector3D(0,0,1))
myMeshGeometry3D.Normals = myNormalCollection
' Create a collection of vertex positions for the MeshGeometry3D.
Dim myPositionCollection As New Point3DCollection()
myPositionCollection.Add(New Point3D(-0.5, -0.5, 0.5))
myPositionCollection.Add(New Point3D(0.5, -0.5, 0.5))
myPositionCollection.Add(New Point3D(0.5, 0.5, 0.5))
myPositionCollection.Add(New Point3D(0.5, 0.5, 0.5))
myPositionCollection.Add(New Point3D(-0.5, 0.5, 0.5))
myPositionCollection.Add(New Point3D(-0.5, -0.5, 0.5))
myMeshGeometry3D.Positions = myPositionCollection
' Create a collection of texture coordinates for the MeshGeometry3D.
Dim myTextureCoordinatesCollection As New PointCollection()
myTextureCoordinatesCollection.Add(New Point(0, 0))
myTextureCoordinatesCollection.Add(New Point(1, 0))
myTextureCoordinatesCollection.Add(New Point(1, 1))
myTextureCoordinatesCollection.Add(New Point(1, 1))
myTextureCoordinatesCollection.Add(New Point(0, 1))
myTextureCoordinatesCollection.Add(New Point(0, 0))
myMeshGeometry3D.TextureCoordinates = myTextureCoordinatesCollection
' Create a collection of triangle indices for the MeshGeometry3D.
Dim myTriangleIndicesCollection As New Int32Collection()
myTriangleIndicesCollection.Add(0)
myTriangleIndicesCollection.Add(1)
myTriangleIndicesCollection.Add(2)
myTriangleIndicesCollection.Add(3)
myTriangleIndicesCollection.Add(4)
myTriangleIndicesCollection.Add(5)
myMeshGeometry3D.TriangleIndices = myTriangleIndicesCollection
' Apply the mesh to the geometry model.
myGeometryModel.Geometry = myMeshGeometry3D
' The material specifies the material applied to the 3D object. In this sample a
' linear gradient covers the surface of the 3D object.
' Create a horizontal linear gradient with four stops.
Dim myHorizontalGradient As New LinearGradientBrush()
myHorizontalGradient.StartPoint = New Point(0, 0.5)
myHorizontalGradient.EndPoint = New Point(1, 0.5)
myHorizontalGradient.GradientStops.Add(New GradientStop(Colors.Yellow, 0.0))
myHorizontalGradient.GradientStops.Add(New GradientStop(Colors.Red, 0.25))
myHorizontalGradient.GradientStops.Add(New GradientStop(Colors.Blue, 0.75))
myHorizontalGradient.GradientStops.Add(New GradientStop(Colors.LimeGreen, 1.0))
' Define material and apply to the mesh geometries.
Dim myMaterial As New DiffuseMaterial(myHorizontalGradient)
myGeometryModel.Material = myMaterial
' Apply a transform to the object. In this sample, a rotation transform is applied,
' rendering the 3D object rotated.
Dim myRotateTransform3D As New RotateTransform3D()
Dim myAxisAngleRotation3d As New AxisAngleRotation3D()
myAxisAngleRotation3d.Axis = New Vector3D(0,3,0)
myAxisAngleRotation3d.Angle = 40
myRotateTransform3D.Rotation = myAxisAngleRotation3d
myGeometryModel.Transform = myRotateTransform3D
' Add the geometry model to the model group.
myModel3DGroup.Children.Add(myGeometryModel)
' Add the group of models to the ModelVisual3d.
myModelVisual3D.Content = myModel3DGroup
'
myViewport3D.Children.Add(myModelVisual3D)
' Apply the viewport to the page so it will be rendered.
Me.Content = myViewport3D
End Sub
End Class
End Namespace
Vedi anche
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