Hi all,

I want to blend out the "elevation model" an also the complete height field
so that I can see what is below the surface (with timesteps by "clock").
But I don't understand what parameter I have to use to do this.

tnx, wolfgang

This is the code I have:

height_field {
 tga "dem15v2.tga"    // my height model
 smooth
    texture {
        pigment {
                image_map { // an overlay graphic
                facing +z, top to +Y
                png "luft5.png"

                transmit all 0.4  // some transparence so that I can see
partly below surface
                once
                }
             rotate x*90 // align map to height_field
        }

     }

  finish {
     ambient 0.6 // Very dark shadows
     diffuse 0.1 // Whiten the whites
     specular 0.25
     roughness 0.4

     }

  scale <10980,65535,10980 > // dx,dz,dy of extent in meters
  translate < 419020, 0, 279020> // west_corner, 0, south_corner
}

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to make it more clear, even with "transmit all 1" I get black pixels where
the view through the topology is flat.

An example image is found here:
http://www.student.kuleuven.ac.be/~s0167070/ttqv/test.png

Wolfgang

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wollinger <wol### [at] gmznet> wrote:
> http://www.student.kuleuven.ac.be/~s0167070/ttqv/test.png

  Have you tried global_settings { max_trace_level 10 } just to make sure
it's not a problem with that?

-- 
                                                          - Warp

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Hello Warp,

that did the trick! I'm using povray since yesterday so I don't know all the
hints jet.

Wolfgang


Warp <war### [at] tagpovrayorg> wrote:
> wollinger <wol### [at] gmznet> wrote:
> > http://www.student.kuleuven.ac.be/~s0167070/ttqv/test.png
>
>   Have you tried global_settings { max_trace_level 10 } just to make sure
> it's not a problem with that?
>
> --
>                                                           - Warp

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wollinger nous apporta ses lumieres en ce 01/04/2006 17:32:

>   finish {
>      ambient 0.6 // Very dark shadows
>      diffuse 0.1 // Whiten the whites
>      specular 0.25
>      roughness 0.4
> 
>      }
> 
The values in that finish don't fit the comments.
ambient 0.6 is a prety large value, it will make the shadows very light.
diffuse 0.1 is a low value, making your pigment interact very little with your
light_source.

Usual values are more like:
finish{
	ambient 0.01 // very dark, almost black shadow
	diffuse 0.99 // virtualy all illumination comes from incident light
...
}
-- 
Alain
-------------------------------------------------
42.7 percent of all statistics are made up on the spot.

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Hi Alan,

that explains a lot! I was always wondering why the location of my light
source did not change anything in the shadows. Now my light source has an
influenceon the scene!

Thank you very much

Wolfgang

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