On 2/12/2016 11:10 PM, Mike Horvath wrote:
> I want to create something like the first row of pictures here:
>
>
https://www.google.com/search?q=povray+cave&espv=2&biw=1838&bih=995&source=lnms&tbm=isch&sa=X&ved=0ahUKEwjk6-TN7fPKAhVW22MKHTxUCdgQ_AUIBigB#tbm=isch&q=cave+entrance+model
>
>
> It can be an entirely natural formation and not man-made.
>
> What would be a good way to go about doing it?
>

I did a tunnel with a heightfield and a bore difference.

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