albe99 wrote:
> Hello, I'm Alberto from Italy..
> I would want to modify an height_field with a normal pattern (granite for
> example..) and then generate a new 16 bit grayscale image (png or tga..) to
> re-use in other height_field statement..
> is possible to do this?
> 
> I have written this basic sample:
> //------------------------------
> #include "colors.inc"
> 
> global_settings {
>    hf_gray_16 on
> }
> 
> camera {
>    orthographic
>    location <0.518756, 1.42622, 0.517175>
>    sky <0, 1, 0>
>    direction <0, 0, 1>
>    right <1, 0, 0>
>    up <0, 1, 0>
>    look_at <0.518487, 0.464293, 0.493562>
> }
> 
> height_field {
>    png "HFtest01.png"
>    scale <1, 0.3, 1>
>    rotate <0, 0, 0>
>    translate y*0.0870551
> 
>    texture {
>       normal { granite 0.4 }
>       pigment { color rgb <0.32549, 0.32549, 0.32549> }
>       finish { ambient 1 }
>    }
> }
> //--------------------------------------
> ....but render shows me nothing, please can someone help me?
> 
> Thanks, Alberto
> 
> 
> 
> 
> 
It is because the use of pure ambient light does not show the relief of 
either the hf or the normal

You need a light_source  and start with the default finish.  You can 
then adjust the light_source, its angle to the hf and the finish diffuse 
and specular parameters to get what you want ambient should be low or zero

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