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http://hometown.aol.com/persistenceofv/mountainscene.mpg 567KB Mpeg animation.
It's an old subject. A little newer is the slope-dependent texturing made
possible in MegaPov. I've skipped using the 'hf_height_at' keyword so far but I
might give that a try in this animation later. I noticed something bad about
the height fields, something mentioned a few times before maybe but too long ago
for me to remember. There were invisible pixels scattered throughout, as if in
a grid much smaller than the dimension of each height field, most noticeable
looking more directly down onto them.
The slope texture hasn't been easy for me to learn and I'm still confused by it.
This Mpeg was done with VideoMach2 for the small file size but its compression
shows. However those are very thin clouds you will see thanks to a turbulent
ground fog and not just artifacts.
Anything to ask or tell, go ahead.
Bob
--
omniVerse http://users.aol.com/persistenceofv/all.htm
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In article <38f99d00@news.povray.org>, "Bob Hughes"
<per### [at] aol com?subject=PoV-News:> wrote:
> I've skipped using the 'hf_height_at' keyword so far but I might give
> that a try in this animation later.
I personally prefer to use trace(), since it works on any object. If you
decide later to have a flat area on the landscape using CSG or to use an
isosurface as the landscape, trace() will still work, but hf_height_at
won't...
Also, you can get the surface normal with trace(), which can be useful
for some things.
--
Christopher James Huff - Personal e-mail: chr### [at] yahoocom
TAG(Technical Assistance Group) e-mail: chr### [at] tagpovrayorg
Personal Web page: http://chrishuff.dhs.org/
TAG Web page: http://tag.povray.org/
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"Chris Huff" <chr### [at] yahoocom> wrote in message
news:chrishuff_99-5FCBBC.16050516042000@news.povray.org...
| I personally prefer to use trace(), since it works on any object. If you
| decide later to have a flat area on the landscape using CSG or to use an
| isosurface as the landscape, trace() will still work, but hf_height_at
| won't...
| Also, you can get the surface normal with trace(), which can be useful
| for some things.
Hey thanks, hadn't thought of it failing when used in CSG. I was planning on
flat areas for water but will probably just blacken out parts in the image used
for the HF. Not likely to add objects in, like buildings and such, but I should
start trying out trace anyway.
Bob
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