POV-Ray : Newsgroups : povray.advanced-users : camera ray hit based slope mapping Server Time
24 Nov 2024 21:28:54 EST (-0500)
  camera ray hit based slope mapping (Message 1 to 4 of 4)  
From: The Pete
Subject: camera ray hit based slope mapping
Date: 25 Oct 2004 15:59:09
Message: <417d5b0d$1@news.povray.org>
I'm not 100% sure if this is even possible, but I've been working in pov for 
some time and I can't figure it out, I thought perhaps I'd give the user 
support groups a pop.

Basically, what I'm trying to get is an effect not dissimilar tothe 
holograms inthe Final Fantasy movie, where an object is transparent where 
the surface normal points atthe camera, but reaches full opacity as the 
surface slopes towards 90 degrees from the view point.

I can get something similar using a slope map with a transparancy in the 
color map using the angle of the camera as the gradient of the slope map.

However if this object is seen through a mirror or rotated, it just looks 
WIERD. what would be ideal is some way of re-aligning the slope map so that 
it's gradient was equal to the angle the camera ray hits it.

Does anyone know if it's possible? #
If not, does anyone know where I can suggest it as an update for version 
3.7, because I know that 3DStudio max can do it and presumably whatever 
SquareFilm rendered the FF movie in can do it, so it's clearly a useful 
feature...

-ThePete


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From: Slime
Subject: Re: camera ray hit based slope mapping
Date: 25 Oct 2004 16:01:26
Message: <417d5b96$1@news.povray.org>
> Basically, what I'm trying to get is an effect not dissimilar tothe
> holograms inthe Final Fantasy movie, where an object is transparent where
> the surface normal points atthe camera, but reaches full opacity as the
> surface slopes towards 90 degrees from the view point.

I think you're looking for the angle of incidence pattern which you can find
in MegaPov.

 - Slime
 [ http://www.slimeland.com/ ]


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From: The Pete
Subject: Re: camera ray hit based slope mapping
Date: 25 Oct 2004 18:53:16
Message: <417d83dc@news.povray.org>
Excellent, works a treat.

Cheers for that. Any word on whether that'll be in POV 4.0 as standard?

-Pete

"Slime" <fak### [at] emailaddress> wrote in message 
news:417d5b96$1@news.povray.org...
>> Basically, what I'm trying to get is an effect not dissimilar tothe
>> holograms inthe Final Fantasy movie, where an object is transparent where
>> the surface normal points atthe camera, but reaches full opacity as the
>> surface slopes towards 90 degrees from the view point.
>
> I think you're looking for the angle of incidence pattern which you can 
> find
> in MegaPov.
>
> - Slime
> [ http://www.slimeland.com/ ]
>
>


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From: Slime
Subject: Re: camera ray hit based slope mapping
Date: 25 Oct 2004 20:03:14
Message: <417d9442$1@news.povray.org>
> Cheers for that. Any word on whether that'll be in POV 4.0 as standard?

I'm not a member of the POV Team, but I think it'll be a while before we
hear any sort of definitive information about what features 4.0 will
include.

 - Slime
 [ http://www.slimeland.com/ ]


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