Hello everybody,

I am tryng to make a plane that have the form of a sine function, I tried
something like this:

#declare O11751184 =
box
{
  <1, 1, 1>, <0, 0, 0>

  pigment { image_map
      {
        png
        "/home/viviana/aut.png"
      }
      }
    normal {
    gradient x
    phase clock
    scale <0.2, 1, 1>
    sine_wave
     }
}

object
{
  O11751184
  scale <45,45,1>
  rotate <0,0,0>
  translate <-22.5, -22.5, 0.0>
}


.... but the surface appears plane...help please

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"vianagmo" <vaa### [at] unaleduco> wrote in message 
news:web.46c5b74018de86ba88188d790@news.povray.org...
> Hello everybody,
>
> I am tryng to make a plane that have the form of a sine function, I tried
> something like this:
>
> #declare O11751184 =
> box
> {
>  <1, 1, 1>, <0, 0, 0>
>
>  pigment { image_map
>      {
>        png
>        "/home/viviana/aut.png"
>      }
>      }
>    normal {
>    gradient x
>    phase clock
>    scale <0.2, 1, 1>
>    sine_wave
>     }
> }
>
> object
> {
>  O11751184
>  scale <45,45,1>
>  rotate <0,0,0>
>  translate <-22.5, -22.5, 0.0>
> }
>
>
> .... but the surface appears plane...help please
>

Hi,

I think you're question is a bit incorrectly phrased.

Looking at your posting I think you are trying to add a sine-wave based 
normal to the flat surfaces of the box that you have defined. Indeed you're 
doing this quite successfully, but it doesn't show up on the front surface, 
which is probably where you most wanted it because of the scaling. You have 
applied the normal to the box object, then scaled the object (and also the 
normal) in X and Y by a lot (45), but not in Z. If you scale the normal by 
<0.2, 1, 45>, instead of <0.2,1,1> then you should see the effect I think 
you're after.

On the other hand, if you really are trying to make a surface in the shape 
of a sine wave, then you probably want to use an isosurface rather than a 
box. Isosurfaces can be complicated, but Mike Williams has an excellent 
tutorial that includes a page that describes how to use pattern functions to 
generate a surface at 
http://www.econym.demon.co.uk/isotut/patterns.htm#wave. If that is what you 
need, you may need to ask for an example.

Regards,
Chris B.

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