XNA和FBX着色问题

Question

我的问题是，如果我使用BasicEffect（和设置VertexColorEnabled = true）或我自己的着色器，并且只使用有色（无纹理）模型，它会给出颜色0缺失的错误.. .fbx模型不带有COLOR0通道，这不奇怪吗？

Answer 1

这里是我发现.....（马歇尔贝尔柳@ forums.create.msdn.com/forums/p/16066/553792.aspx#553792）救了我的一天......

解决方案很简单：BasicShader具有DiffuseColor属性。我只是在Toon着色器中添加了一个新字段，任何时候没有纹理，我都会替换颜色值。

我对此解决方案感到高兴，因为现在我不必编写大量的顶点声明/绘制原语逻辑。

从文件名为.fx：

// Pixel shader applies a cartoon shading algorithm. 
float4 ToonPixelShader(LightingPixelShaderInput input) : COLOR0 
{ 
    float4 color = TextureEnabled ? tex2D(Sampler, input.TextureCoordinate) : DiffuseColor; 

更换的效果（这是来自非照片写实样品改性snipet）。

// Scan over all the effects currently on the mesh. 
foreach (BasicEffect oldEffect in mesh.Effects) 
{ 
    // If we haven't already seen this effect... 
    if (!effectMapping.ContainsKey(oldEffect)) 
    { 
     // Make a clone of our replacement effect. We can't just use 
     // it directly, because the same effect might need to be 
     // applied several times to different parts of the model using 
     // a different texture each time, so we need a fresh copy each 
     // time we want to set a different texture into it. 
     Effect newEffect = replacementEffect.Clone( 
            replacementEffect.GraphicsDevice); 

     // Copy across the texture from the original effect. 
     newEffect.Parameters["Texture"].SetValue(oldEffect.Texture); 

     newEffect.Parameters["TextureEnabled"].SetValue( 
              oldEffect.TextureEnabled); 

     Vector4 color = new Vector4(oldEffect.DiffuseColor, 1.0f); 
     newEffect.Parameters["DiffuseColor"].SetValue(color); 

     effectMapping.Add(oldEffect, newEffect); 
    } 
}