关于Direct3D

wmesci 2012-09-19 01:57:04

渲染多个模型的时候出现模型位置前后不对，如图：

上面是一块平板上面放着一根蜡烛，但是蜡烛的下半部分却被平板给遮住了，本来应该按红线显示出来才对。

深度缓存神马的已经开启了，相关代码如下（C#代码，使用SlimDX库）：

创建设备：



var pps = new PresentParameters();

pps.AutoDepthStencilFormat = Format.D16;

pps.EnableAutoDepthStencil = true;

pps.BackBufferWidth = (int)SystemParameters.PrimaryScreenWidth;

pps.BackBufferHeight = (int)SystemParameters.PrimaryScreenHeight;

pps.BackBufferFormat = Format.X8R8G8B8;

pps.SwapEffect = SwapEffect.Discard;

pps.Windowed = windowed;

pps.PresentationInterval = PresentInterval.Default;

pps.Multisample = MultisampleType.FourSamples;



device = new Device(d3d, 0, DeviceType.Hardware, IntPtr.Zero, CreateFlags.HardwareVertexProcessing | CreateFlags.FpuPreserve, pps);

创建渲染目标：



Surface surface = Surface.CreateRenderTarget(device, width, height, Format.X8R8G8B8, MultisampleType.None, 0, false);

渲染循环：



back = device.GetRenderTarget(0);  //保存前一渲染目标

device.SetRenderTarget(0, surface);//设置当前渲染目标



device.Clear(ClearFlags.Target | ClearFlags.ZBuffer, 0, 1.0f, 0);

//设置视图、透视变换矩阵啥的略

device.SetRenderState(RenderState.Lighting, true);

device.SetRenderState(RenderState.ZEnable, true);  //开启Z缓存

device.SetRenderState(RenderState.MultisampleAntialias, true);

device.SetRenderState(RenderState.NormalizeNormals, true);

device.SetRenderState(RenderState.Ambient, Scene.Ambient.ToArgb());

device.SetRenderState(RenderState.CullMode, SlimDX.Direct3D10.CullMode.Front);

device.SetRenderState(RenderState.FillMode, FillMode.Solid);

//设置灯光略

device.BeginScene();

//循环绘制每个模型

for(...)

{

    device.VertexDeclaration = data.VertexDeclaration;               //顶点格式

    device.SetStreamSource(0, data.VertexBuffer, 0, data.VertexSize);//顶点数据

    device.Indices = data.IndexBuffer;                               //索引数据

    device.SetTransform(TransformState.World, data.Transform;        //世界变换

    device.Material = data.Material;                                 //材质

    //纹理

    for (int i = 0; i < data.Textures.Count; i++) 

    {

        device.SetTexture(i, data.Textures[i]);

    }

    device.DrawIndexedPrimitives(PrimitiveType.TriangleList, 0, 0, model.VertexBuffer.Count, 0, model.IndexBuffer.Count / 3);

}



device.EndScene();

device.Present();

device.SetRenderTarget(0, back);//还原前一渲染目标