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/usr/src/castle-game-engine-4.1.1/x3d/doc/x3d_nodes/2/Shaders.txt is in castle-game-engine-src 4.1.1-1.

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X3DShaderNode : X3DAppearanceChildNode {
  SFBool   [in]     activate
  SFBool   [out]    isSelected
  SFBool   [out]    isValid
  SFString []       language   ""   ["CG"|"GLSL"|"HLSL"|...]
}

X3DVertexAttributeNode : X3DGeometricPropertyNode {
  SFString []       name     "" 
}

ComposedShader : X3DShaderNode, X3DProgrammableShaderObject {
  MFNode    [in,out] parts      []   [ShaderPart]
  # And any number of:
}

FloatVertexAttribute : X3DVertexAttributeNode {
  MFFloat  [in,out] value  		  []   (-Inf,Inf)
  SFInt32  []       numComponents 4    [1..4]
}

Matrix3VertexAttribute : X3DVertexAttributeNode {
  MFMatrix3f [in,out] value    []   (-Inf,Inf)
}

Matrix4VertexAttribute : X3DVertexAttributeNode {
  MFMatrix4f [in,out] value    []   (-Inf,Inf)
}

PackagedShader : X3DShaderNode, X3DUrlObject, X3DProgrammableShaderObject {
  MFString  [in,out] url        []   [URI]
  # And any number of:
}

ProgramShader : X3DShaderNode {
  MFNode   [in,out] programs   []   [ShaderProgram]
}

ShaderPart : X3DNode, X3DUrlObject {
  MFString [in,out] url      []         [URI]
  SFString []       type     "VERTEX"   ["VERTEX"|"FRAGMENT"]
}

ShaderProgram : X3DNode, X3DUrlObject, X3DProgrammableShaderObject {
  MFString  [in,out] url       []           [URI]
  SFString  []       type      "VERTEX"     ["VERTEX"|"FRAGMENT"]
  # And any number of:
}