czm_piOverThree
        A built-in GLSL floating-point constant for pi/3.
    
Example
// GLSL declaration const float czm_piOverThree = ...; // Example float pi = 3.0 * czm_piOverThree;
        
        
        
        
        
        A built-in GLSL floating-point constant for pi/3.
    
// GLSL declaration const float czm_piOverThree = ...; // Example float pi = 3.0 * czm_piOverThree;