Graphics 食人魔材料脚本；如何为一项技术提供多个lod_索引？

我有一个材质脚本，它定义了4种渲染技术。1使用GLSL着色器，然后是3个仅使用不同分辨率纹理的其他着色器
如果图形卡支持GLSL着色器，我希望无条件地使用它，否则根据相机距离使用其他3种纹理

目前我的剧本是

material foo
{
lod_distances 1600 2000

technique shaders
{
     lod_index 0
     lod_index 1
     lod_index 2

     //various passes here
}

technique high_res {
     lod_index 0
     //various passes here
}

technique medium_res {
     lod_index 1
     //various passes here
}

technique low_res {
     lod_index 2
     //various passes here
}

额外信息 政府说

增加索引表示详细程度较低

你可以（而且经常会）为同一LOD索引指定多个技术，这意味着食人魔将从同一LOD索引中选择最佳技术

食人魔决定哪一个是“最好的”，哪一个被列在第一位

目前，在支持我使用的GLSL版本的机器上，脚本的行为如下：

• 摄影机>2000：着色器技术

---

• Camera>1600您针对不同LOD值使用不同技术的方法确实是正确的。包含材质LOD用法的完整示例文件如下所示
  注意：您当然可以更改LOD策略以满足您的需要。食人魔手册中解释了所有有效的策略值及其行为

  material testLOD
  {
  lod_strategy screen_ratio_pixel_count
  lod_values 0.8 0.6 0.4 0.2
  
  technique red10
  {
      pass red
      {
          ambient 0.698039 0.698039 0.698039 1
          diffuse 0.698039 0.698039 0.698039 1
          specular 0.898039 0.898039 0.898039 1 20
          emissive 1 0 0 1
      }
  }
  
  technique green20
  {
      lod_index 1
      pass green
      {
          ambient 0.698039 0.698039 0.698039 1
          diffuse 0.698039 0.698039 0.698039 1
          specular 0.898039 0.898039 0.898039 1 20
          emissive 0 1 0 1
      }
  }
  
  technique cyan100
  {
      lod_index 2
      pass cyan
      {
          ambient 0.698039 0.698039 0.698039 1
          diffuse 0.698039 0.698039 0.698039 1
          specular 0.898039 0.898039 0.898039 1 20
          emissive 0 0.945098 0.980392 1
      }
  }
  
  technique blue200
  {
      lod_index 3
      pass blue
      {
          ambient 0.698039 0.698039 0.698039 1
          diffuse 0.698039 0.698039 0.698039 1
          specular 0.898039 0.898039 0.898039 1 20
          emissive 0 0 1 1
      }
  }
  
  technique yellow1000
  {
      lod_index 4
      pass yellow
      {
          ambient 0.698039 0.698039 0.698039 1
          diffuse 0.698039 0.698039 0.698039 1
          specular 0.898039 0.898039 0.898039 1 20
          emissive 1 1 0 1
      }
  }
  }
  

  ---

  您针对不同LOD值使用不同技术的方法确实是正确的。包含材质LOD用法的完整示例文件如下所示
  注意：您当然可以更改LOD策略以满足您的需要。食人魔手册中解释了所有有效的策略值及其行为

  material testLOD
  {
  lod_strategy screen_ratio_pixel_count
  lod_values 0.8 0.6 0.4 0.2
  
  technique red10
  {
      pass red
      {
          ambient 0.698039 0.698039 0.698039 1
          diffuse 0.698039 0.698039 0.698039 1
          specular 0.898039 0.898039 0.898039 1 20
          emissive 1 0 0 1
      }
  }
  
  technique green20
  {
      lod_index 1
      pass green
      {
          ambient 0.698039 0.698039 0.698039 1
          diffuse 0.698039 0.698039 0.698039 1
          specular 0.898039 0.898039 0.898039 1 20
          emissive 0 1 0 1
      }
  }
  
  technique cyan100
  {
      lod_index 2
      pass cyan
      {
          ambient 0.698039 0.698039 0.698039 1
          diffuse 0.698039 0.698039 0.698039 1
          specular 0.898039 0.898039 0.898039 1 20
          emissive 0 0.945098 0.980392 1
      }
  }
  
  technique blue200
  {
      lod_index 3
      pass blue
      {
          ambient 0.698039 0.698039 0.698039 1
          diffuse 0.698039 0.698039 0.698039 1
          specular 0.898039 0.898039 0.898039 1 20
          emissive 0 0 1 1
      }
  }
  
  technique yellow1000
  {
      lod_index 4
      pass yellow
      {
          ambient 0.698039 0.698039 0.698039 1
          diffuse 0.698039 0.698039 0.698039 1
          specular 0.898039 0.898039 0.898039 1 20
          emissive 1 1 0 1
      }
  }
  }
  

   Compiler error: fewer parameters expected in foo.material(#): lod_index only supports 1 argument
  

  technique shaders
  {
       lod_index 0
       //Shader passes here
  }
  
  
  technique shaders1
  {
       lod_index 1
       //DUPLICATE of shader passses in lod 0
  }
  
  
  technique shaders2
  {
       lod_index 2
       //DUPLICATE of shader passses in lod 0
  }
  

  material testLOD
  {
  lod_strategy screen_ratio_pixel_count
  lod_values 0.8 0.6 0.4 0.2
  
  technique red10
  {
      pass red
      {
          ambient 0.698039 0.698039 0.698039 1
          diffuse 0.698039 0.698039 0.698039 1
          specular 0.898039 0.898039 0.898039 1 20
          emissive 1 0 0 1
      }
  }
  
  technique green20
  {
      lod_index 1
      pass green
      {
          ambient 0.698039 0.698039 0.698039 1
          diffuse 0.698039 0.698039 0.698039 1
          specular 0.898039 0.898039 0.898039 1 20
          emissive 0 1 0 1
      }
  }
  
  technique cyan100
  {
      lod_index 2
      pass cyan
      {
          ambient 0.698039 0.698039 0.698039 1
          diffuse 0.698039 0.698039 0.698039 1
          specular 0.898039 0.898039 0.898039 1 20
          emissive 0 0.945098 0.980392 1
      }
  }
  
  technique blue200
  {
      lod_index 3
      pass blue
      {
          ambient 0.698039 0.698039 0.698039 1
          diffuse 0.698039 0.698039 0.698039 1
          specular 0.898039 0.898039 0.898039 1 20
          emissive 0 0 1 1
      }
  }
  
  technique yellow1000
  {
      lod_index 4
      pass yellow
      {
          ambient 0.698039 0.698039 0.698039 1
          diffuse 0.698039 0.698039 0.698039 1
          specular 0.898039 0.898039 0.898039 1 20
          emissive 1 1 0 1
      }
  }
  }