osg学习（五十八）cow.osg解析过程

Posted 2022-02-16 hankern

1、文件结构

Group 
  UniqueID Group_0
  DataVariance STATIC
  cullingActive TRUE
  num_children 1
  Geode 
    DataVariance DYNAMIC
    name "cow.osg"
    cullingActive TRUE
    num_drawables 1
    Geometry 
      DataVariance DYNAMIC
      StateSet 
        DataVariance STATIC
        rendering_hint OPAQUE_BIN
        renderBinMode INHERIT
        GL_CULL_FACE OFF
        GL_LIGHTING ON
        Material 
          DataVariance STATIC
          ColorMode OFF
          ambientColor 0.5 0.5 0.5 1
          diffuseColor 1 1 1 1
          specularColor 1 1 1 1
          emissionColor 0 0 0 1
          shininess 1
        
        textureUnit 0 
          GL_TEXTURE_GEN_S ON
          GL_TEXTURE_GEN_T ON
          GL_TEXTURE_2D ON
          Texture2D 
            DataVariance STATIC
            file "Images/reflect.rgb"
            wrap_s REPEAT
            wrap_t REPEAT
            wrap_r REPEAT
            min_filter NEAREST_MIPMAP_LINEAR
            mag_filter LINEAR
            internalFormatMode USE_IMAGE_DATA_FORMAT
            subloadMode OFF
          
          TexGen 
            DataVariance STATIC
            mode SPHERE_MAP
          
        
      
      useDisplayList TRUE
      Primitives 1
      
        DrawArrayLengths TRIANGLE_STRIP 0 984
        
          3
          3        
		  ...
          14
          5
          5
        
      
      VertexArray 7772
      
        4.76334 -1.36791 3.02949
        4.85496 -1.36297 3.09889
		...
        4.28129 -1.22566 2.49441
        -3.35701 -0.367444 2.22033
        -3.38084 -0.315387 2.25835
        -3.34827 -0.438575 2.2064
        -3.39281 -0.43866 2.20802
        -3.41337 -0.580969 2.31026
      
      NormalBinding PER_VERTEX
      NormalArray 7772
      
        0.254622 -0.918791 -0.301648
        0.440603 -0.85537 -0.272417
        0.244499 -0.920072 -0.306084
        ...
        0.701499 2.00244e-05 0.71267
        0.501693 4.00296e-05 0.865046
        0.465203 0.372921 0.802818
      
      ColorBinding OVERALL
      ColorArray Vec4Array 1
      
        0.8 0.8 0.8 1
      
      TexCoordArray 0 Vec2Array 7772
      
        0 0
        ...
        0 0
        0 0
      
    
  

2、读取文件

2.1读取纹理

2.2读取图元

 2.3读取顶点

2.3读取法线

2.4 读取颜色

 

2.5读取纹理坐标