Hi Chris,

thanks for this two methods, yesterday i found Christoph Hormanns Wave
Include-Files like your second method !

I post it in the german www.povray-forum.de in this thread:
http://www.povray-forum.de/viewtopic.php?t=139

Here my small flag-animations:
http://www.povray-forum.de/Tom33/height_field_ani1.avi
http://www.povray-forum.de/Tom33/height_field_ani2.avi

Now, I will try it with your first method ;o)

Happy New Year,
Tom33


> Hi Tom,
> Yes this is possible.
>
> Two methods spring to mind.
>
> 1) Cut and paste a second copy of the image to the right of the first and
> smooth out the join, then use clipped_by or CSG to take half the height
> field, starting with the left half and moving right until you reach the
> right hand edge as the clock moves from 0 to 1. Then when you create an
> animation loop it should look seamless. Clearly you'll need to scale the
> helf of the height field you use to the size of your flag.
>
> 2) Use a function for the height field rather than an image and rotate the
> pattern so that it returns to the same spot at the end of the animation
> cycle.
>
> The following example illustrates the second method. I've used bumps and
> scaled them to give a more ripple-like effect, then rotated the bump pattern
> around the origin based on the clock value. The height field then uses the
> function, taking samples of the pattern at a point about 0.5 units above the
> x axis. As the pattern rotates frame by frame it gives the impression that
> the ripples are moving through the surface.
>
> p.s. Because the first and last frame are in the same place you'll need to
> delete one or other of them to get a smooth animation cycle (or adjust the
> rotation so it doesn't make it all the way back to the start position).
>
> Happy New Year,
> Chris B.
>
> light_source { < -150, 80  ,-8> color rgb 1}
> camera {location <-0.1,1,-1> look_at <0.5,0.5,0>}
>
> #declare MyFuntion = function {
>   pattern { bumps scale <0.15,0.3,0.15> rotate y*clock*360}
> }
> #declare MyIntensity = 0.08;
>
> height_field {
>   function 400, 400 { MyFuntion(x, y+1, 0.5)*MyIntensity + 0.5 }
>   smooth
>   pigment {color rgb <1,1,1>}
> }

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