我有一个使用WPF 3D图形创建的图像查看器。在那里,图像质量真的很差,所以我开始研究这个问题,创建了一个简单的应用程序,在窗口的顶部使用2D图形显示图像,在底部使用3D图形显示相同的图像。我注意到,与2D图像相比,3D表面上的图像看起来要差得多。3D表面上的颜色饱和度较低,没有清晰的边界。请注意,我将线性位图缩放模式应用于根网格。另一个奇怪的事情是,当我将位图缩放模式更改为“Fant”或“NearestNeighbor”时,它会影响2D图形,但3D表面上的图像仍然保持不变!我在代码中使用高度=466像素,宽度=490像素的图像进行示例。我在代码中对其进行了一些缩小(包括2D和3D实现),以查看缩放质量的降低。代码如下:
<Window x:Class="Scaling3DSample.Window2"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Width="340">
<Grid x:Name="backgroundGrid">
<Grid.RowDefinitions>
<RowDefinition />
<RowDefinition />
</Grid.RowDefinitions>
</Grid>
</Window>
using System;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Media.Media3D;
using System.Windows.Shapes;
namespace Scaling3DSample
{
public partial class Window2 : Window
{
private static double _distanceFromCamera = 0.62618;
public Window2()
{
InitializeComponent();
RenderOptions.SetBitmapScalingMode(backgroundGrid, BitmapScalingMode.Linear);
Create2DGraphics();
// THE SAME IMAGE ON 3D SURFACE LOOKS MUCH WORSE
Create3DGraphics();
}
private void Create2DGraphics()
{
Rectangle exampleRectangle = new Rectangle();
Grid.SetRow(exampleRectangle, 0);
exampleRectangle.Width = 335;
exampleRectangle.Height = 317;
exampleRectangle.Fill = GetBrush();
backgroundGrid.Children.Add(exampleRectangle);
}
private void Create3DGraphics()
{
Viewport3D mainViewPort3D = new Viewport3D();
Grid.SetRow(mainViewPort3D, 1);
mainViewPort3D.Camera = new PerspectiveCamera { LookDirection = new Vector3D(-1, 0, 0), UpDirection = new Vector3D(0, 0, 1), FieldOfView = 77.0942 };
mainViewPort3D.Children.Add(new ModelVisual3D { Content = new AmbientLight() });
MeshGeometry3D geometry3D = new MeshGeometry3D();
Point3D topLeft = new Point3D(-_distanceFromCamera, 0.5, -0.5);
Point3D bottomRight = new Point3D(-_distanceFromCamera, -0.5, 0.5);
geometry3D.Positions.Add(bottomRight);
geometry3D.Positions.Add(new Point3D(-_distanceFromCamera, topLeft.Y, bottomRight.Z));
geometry3D.Positions.Add(new Point3D(-_distanceFromCamera, bottomRight.Y, topLeft.Z));
geometry3D.Positions.Add(topLeft);
geometry3D.TriangleIndices.Add(1);
geometry3D.TriangleIndices.Add(0);
geometry3D.TriangleIndices.Add(2);
geometry3D.TriangleIndices.Add(2);
geometry3D.TriangleIndices.Add(3);
geometry3D.TriangleIndices.Add(1);
geometry3D.TextureCoordinates.Add(new Point(0, 0));
geometry3D.TextureCoordinates.Add(new Point(1, 0));
geometry3D.TextureCoordinates.Add(new Point(0, 1));
geometry3D.TextureCoordinates.Add(new Point(1, 1));
Material material = new DiffuseMaterial(GetBrush());
ModelVisual3D modelForGeometry = new ModelVisual3D { Content = new GeometryModel3D(geometry3D, material) };
mainViewPort3D.Children.Add(modelForGeometry);
backgroundGrid.Children.Add(mainViewPort3D);
}
private ImageBrush GetBrush()
{
// put any other image URI here, image Height = 466px, Width = 490px
ImageBrush brush = new ImageBrush(new BitmapImage(new Uri("lion.jpg", UriKind.Relative)));
brush.Stretch = Stretch.Fill;
return brush;
}
}
}
非常感谢您提供的所有帮助!