"Chris Cason" <nos### [at] deletethispovrayorg> wrote in message 
news:427c0fd7@news.povray.org...
> Bob Hughes wrote:
>> someplace in Shapes.pov getting bounding boxes removed; turned out to be 
>> the
>> three parametric objects.
>
> This is normal; it also happens with v3.6.

Ahhh, okay, parametric isn't something I ever use. Just wanted to be sure 
something wasn't going wrong with it anyway.

>> Also, while I'm here, I've seen that the isosurfaces (again, about menu
>> images) for waveforms is still problematic.
>
> Can you provide an example scene ?

The file  Insert Menu\attributes.pov  and then using:

  #declare Typ=1;     // waveform

 is the actual one I'm talking about. Rendering changes (for me here, 
anyhow) for different resolutions, so you'll need to check a couple 
different image sizes probably. It varies a great deal, from what I've seen.

Watch for pieces missing from the tops, jaggedness, and such. Should be 
smooth representations of the five waveforms:
ramp_wave; triangle_wave; scallop_wave; sine_wave; poly_wave.

Note that the max_gradient numbers for each was the part tweaked to try and 
prevent any reports in the message stream of possible changes for 
improvement for the isosurface max_gradient, which it tends to do otherwise 
as you well know. That reminds me, the Render Menu Bitmaps doesn't do the 
message stream as it used to, guessing you realize that, but not sure you 
do. In 3.6 is only reported progress by a count, whereas 3.7 is showing full 
stats for each and every one.

Might be easier to use the following excerpt of SDL from that file.

// waveforms graphic
// command line suggested in the attributes.pov, so you can use that.
//cmd: -w120 -h48 +a0.1 +am2 -j +r3

#declare Cnt=0;

#while (Cnt < 5)

  #local fn_grad=
  function {
    pigment {
      gradient x
      color_map { [0 rgb 0][1 rgb 1] }
      #switch (Cnt)
        #case (1)
          triangle_wave
          #break
        #case (2)
          scallop_wave
          #break
        #case (3)
          sine_wave
          #break
        #case (4)
          poly_wave 2
          #break
        #else
          ramp_wave
      #end

      scale 1.2

    }
  }

  #declare Tex1=
  texture {
    pigment {
      function { fn_grad(x, y, z).gray }
      color_map { [0 rgb 0][1 rgb 1] }
    }
    finish { ambient 0.2 specular 0.4 }
  }

  object {
    isosurface {
      function { z-fn_grad(x, y, 0).gray*0.5 }

      max_gradient
      #switch (Cnt)
        #case (0) 1000 #break
        #case (1) 0.4 #break
        #case (2) 0.4 #break
        #case (3) 0.4 #break
        #case (4) 975 #break
      #end
      accuracy 0.001
      contained_by { box { <-0.8, -1.2, -1.2> <0.8, 1.2, 1.2> } }
    }

    texture { Tex1 }
    no_shadow
    translate <-4.0+Cnt*2, 0, 0>
  }

  #undef fn_grad

  #declare Cnt=Cnt+1;
#end

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