Question

我需要渲染从AutoDesk 3DS max导入的.obj，以获得jpg或png文件中的输出。我该怎么做？我正在使用Expression blend 4和WPF Visual Studio。

Answer 1

使用SharpGL，一个C＃库，使您可以非常轻松地在C＃应用程序中使用OpenGL。它确实包括支持直接加载.obj文件。

Double Edit ：我已经使用它们的实现替换了我的代码示例。我运行了以下代码，它确实有效，它加载了.obj并在屏幕上呈现它没有问题

XAML ..请务必添加

xmlns:sharpGL="clr-namespace:SharpGL.WPF;assembly=SharpGL.WPF"

到窗口属性

<Grid>
    <Grid.RowDefinitions>
        <RowDefinition Height="30" />
        <RowDefinition />
    </Grid.RowDefinitions>
    <StackPanel Grid.Row="0" Orientation="Horizontal">
        <Button Content="Add Item" Click="Add_Click" />
        <Button Content="Take Screen Shot" Click="ScreenShot_Click" />
    </StackPanel>

    <sharpGL:OpenGLControl Grid.Row="1" Name="myOpenGLControl"
        OpenGLDraw="OpenGLControl_OpenGLDraw" OpenGLInitialized="OpenGLControl_OpenGLInitialized"
        RenderContextType="FBO" />
</Grid>

背后的代码

注意：我实际上没有实现图形的保存，但此时您可以在屏幕上呈现模型的预览。

public partial class MainWindow : Window
{
    float rotation_angle = 0f;
    float rotation_x = 0f;
    float rotation_y = 0f;
    float rotation_z = 0f;

    private List<Polygon> _polygons = new List<Polygon>();

    public MainWindow()
    {
        InitializeComponent();

        myOpenGLControl.OpenGL.Enable(OpenGL.GL_TEXTURE_2D);
    }

    private void OpenGLControl_OpenGLDraw(object sender, SharpGL.SceneGraph.OpenGLEventArgs args)
    {
        OpenGL gl = args.OpenGL;

        // Clear The Screen And The Depth Buffer
        gl.Clear(OpenGL.GL_COLOR_BUFFER_BIT | OpenGL.GL_DEPTH_BUFFER_BIT);

        // Move Left And Into The Screen
        gl.LoadIdentity();
        gl.Translate(0.0f, -1.0f, -10.0f);

        gl.Rotate(rotation_angle, rotation_x, rotation_y, rotation_z);

        foreach (Polygon polygon in _polygons)
        {
            polygon.PushObjectSpace(gl);
            polygon.Render(gl, SharpGL.SceneGraph.Core.RenderMode.Render);
            polygon.PopObjectSpace(gl);
        }

        rotation_angle += 3;
        rotation_x = 0;
        rotation_y = 20;
        rotation_z = -5;
    }

    private void OpenGLControl_OpenGLInitialized(object sender, SharpGL.SceneGraph.OpenGLEventArgs args)
    {
        OpenGL gl = args.OpenGL;

        gl.Enable(OpenGL.GL_DEPTH_TEST);

        float[] global_ambient = new float[] { 0.5f, 0.5f, 0.5f, 1.0f };
        float[] light0pos = new float[] { 0.0f, 5.0f, 10.0f, 1.0f };
        float[] light0ambient = new float[] { 0.2f, 0.2f, 0.2f, 1.0f };
        float[] light0diffuse = new float[] { 0.3f, 0.3f, 0.3f, 1.0f };
        float[] light0specular = new float[] { 0.8f, 0.8f, 0.8f, 1.0f };

        float[] lmodel_ambient = new float[] { 0.2f, 0.2f, 0.2f, 1.0f };
        gl.LightModel(OpenGL.GL_LIGHT_MODEL_AMBIENT, lmodel_ambient);

        gl.LightModel(OpenGL.GL_LIGHT_MODEL_AMBIENT, global_ambient);
        gl.Light(OpenGL.GL_LIGHT0, OpenGL.GL_POSITION, light0pos);
        gl.Light(OpenGL.GL_LIGHT0, OpenGL.GL_AMBIENT, light0ambient);
        gl.Light(OpenGL.GL_LIGHT0, OpenGL.GL_DIFFUSE, light0diffuse);
        gl.Light(OpenGL.GL_LIGHT0, OpenGL.GL_SPECULAR, light0specular);
        gl.Enable(OpenGL.GL_LIGHTING);
        gl.Enable(OpenGL.GL_LIGHT0);

        gl.ShadeModel(OpenGL.GL_SMOOTH);
    }

    private void Add_Click(object sender, RoutedEventArgs e)
    {
        List<Polygon> polygons = LoadScene("ducky.obj");
        polygons.ScaleMaxExtentTo(10);
        _polygons.AddRange(polygons);
    }

    private void ScreenShot_Click(object sender, RoutedEventArgs e)
    {
        //Here you can use either of the below methods to get the raw pixel data
        //which needs to be manually formatted for the file type of your choice.
        //myOpenGLControl.OpenGL.ReadBuffer();
        //myOpenGLControl.OpenGL.ReadPixels();
    }

    private List<Polygon> LoadScene(string filePath)
    {
        List<Polygon> polygons = new List<Polygon>();
        Scene scene = SerializationEngine.Instance.LoadScene(filePath);
        if (scene != null)
        {
            polygons.AddRange(scene.SceneContainer.Traverse<Polygon>());
        }

        return polygons;
    }
}

public static class ExtensionMethods
{
    /// <summary>Scales the polygons to not excede the maximum size in OpenGL Units.</summary>
    public static void ScaleMaxExtentTo(this List<Polygon> polygons, float maxSize)
    {
        foreach (var polygon in polygons) { polygon.ScaleMaxExtentTo(maxSize); }
    }

    /// <summary>Scales the polygon to not excede the maximum size in OpenGL Units.</summary>
    public static void ScaleMaxExtentTo(this Polygon polygon, float maxSize)
    {
        float[] extent = new float[3];
        polygon.BoundingVolume.GetBoundDimensions(out extent[0], out extent[1], out extent[2]);
        float maxExtent = extent.Max();
        float scaleFactor = maxExtent > maxSize ? maxSize / maxExtent : 1;
        polygon.Transformation.ScaleX = scaleFactor;
        polygon.Transformation.ScaleY = scaleFactor;
        polygon.Transformation.ScaleZ = scaleFactor;
    }
}

渲染WPF应用程序以获取.jpg / .png中的输出

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