povray-for-hillshades.pov

#include "shapes.inc"
#include "colors.inc"
#include "textures.inc"
                                    
// Dropped in from http://wiki.povray.org/content/HowTo:Use_radiosity                                    
#local p_start		=	64/image_width;
#local p_end_tune	=	8/image_width;
#local p_end_final	=	4/image_width;
                                                              
#local smooth_eb	=	0.50;
#local smooth_count	=	75;

#local final_eb		=	0.1875;
#local final_count	=	smooth_count * smooth_eb * smooth_eb / (final_eb * final_eb);
                        
global_settings{

radiosity
{
    pretrace_start p_start      // Use a pretrace_end value close to what you
    pretrace_end   p_end_tune    // intend to use for your final trace
    count final_count            // as calculated above
    nearest_count 10             // 10 will be ok for now
    error_bound final_eb         //  from what we determined before, defined above
                                 //   halfway between 0.25 and 0.5
    recursion_limit 2            // Recursion should be near what you want it to be
                                 //  If you aren't sure, start with 3 or 4
    }
}                                    
           
// Orthographic camera allows us to return non-perspective image of elevation model                                    
camera { 
   orthographic
   location <0.5, 2, 0.75>  
   look_at <0.5,0,0.75>
   right 0.25*x            // horizontal size of view -- I have this zoomed in on my area of interest.
   up 0.25*y               // vertical size of view   -- set to 1*x and 1*y to get full DEM hillshade returned
}

// Here's where the height field get's loaded in for shading
height_field {
   png "result.png"
   water_level 0.0
   smooth    
  texture {
	pigment {
		rgb <1, 1, 1>
	}
  }                   
    finish {
          ambient 0.2         
          diffuse 0.8          
          specular 0
          roughness 40
    }  
   scale <1, 1, 1> 
   translate <0,0,0> 
}

// Pulled in from http://www.f-lohmueller.de/pov_tut/backgrnd/p_sky10.htm
// Using an HDR from http://www.pauldebevec.com/Probes/
sky_sphere{
  pigment{
    image_map{ hdr "rnl_probe.hdr"
               gamma 0.25
               map_type 1 interpolate 2}
      }// end pigment
      rotate <0,40,0> //
} // end sphere with hdr image -----------