pllightsource: Sets the 3D position of the light
      source
    
      
    
      Sets the 3D position of the light source for use with plsurf3d and plsurf3dl
    
- 
	  x(PLFLT
- 
	    X-coordinate of the light source.
	   
- 
	  y(PLFLT
- 
	    Y-coordinate of the light source.
	   
- 
	  z(PLFLT
- 
	    Z-coordinate of the light source.
	   
      Redacted form: pllightsource(x, y, z)
    
      This function is used in example 8.