What type of image do you normally use?  Is there one better than the
other.  I'm going to use tga, but what about the others?

Ken wrote:
> 
> Wojtek Bauman wrote:
> >
> > Howdy
> >
> > I resized the image I made a HF from (width*2, height*2) and all the
> > black spots disappeared.
> > Thank you again.
> 
>   Your welcome. This is a good time to point out to anyone who uses height
> fields in their scenes that the resolution quality of your HF is directly
> proportional to the resolution of the image used to create it. The higher
> the resolution of the image the higher the resolution your HF can have. I
> generally use nothing less the 600x600 unless it will be used for something
> minor like a rust spot on a piece of metal or the HF is used for something
> like gently rolling hills. If there are any large variations in the heights
> in adjacent areas the larger resolutions become more critical and can also
> greatly reduce gridding and cracking as is often a complaint where HF's are
> used.
>   Another point to consider is the color depth of the image used. If you
> use an 8 bit 256 color image for your HF you are limited to the number of
> Hf values that can be obtained to 256 total values. If on the other hand
> you use a 16 bit 16 million color image you have considerably greater
> control over how many different height values are possible in the HF
> itself. There is good reason why the Pov team added the hf_gray_16 option
> and this is to allow you greater control of the use of HF's in your scenes.
> 
> --
> Ken Tyler
> 
> See my 850+ Povray and 3D Rendering and Raytracing Links at:
> http://home.pacbell.net/tylereng/index.html

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