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31 Oct 2024 19:27:30 EDT (-0400)
  [Noob] Camera help (Message 1 to 7 of 7)  
From: Caligula
Subject: [Noob] Camera help
Date: 21 Jun 2007 10:00:02
Message: <web.467a84289c4ccf4c7b1722700@news.povray.org>
I can't get the camera to go where I want it to go, when I put in
coordinates, it always ends up being rotated. What am I doing wrong (or
what should I be doing right)?


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From: Verm
Subject: Re: [Noob] Camera help
Date: 21 Jun 2007 12:00:26
Message: <467aa09a$1@news.povray.org>
Caligula wrote:
> I can't get the camera to go where I want it to go, when I put in
> coordinates, it always ends up being rotated. What am I doing wrong (or
> what should I be doing right)?

As with any question:
What are you trying to do?

What are you doing?
(at least post your camera code)

What goes "wrong"?
(what do you mean rotated? there are 3 axes of rotation - which do you 
have problem with?)


Where is the problem with using a standard camera and setting the 
location and the look at points?

camera{
   up y
   right x*image_width/image_height
   location <0,2,-10>         //where the camera is
   look_at  <0,2,0>           //where you want to look
   angle 41
}


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From: William Tracy
Subject: Re: [Noob] Camera help
Date: 21 Jun 2007 15:34:35
Message: <467ad2cb$1@news.povray.org>
Caligula wrote:
> I can't get the camera to go where I want it to go, when I put in
> coordinates, it always ends up being rotated. What am I doing wrong (or
> what should I be doing right)?

Well, just a wild guess here--the camera by default tries to orient 
itself with y as "up". If your camera is pointed straight up or straight 
down the y axis, it can get confused.

-- 
William Tracy
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You know you've been raytracing too long when your 18 year-old daughter 
asks if she can marry one of the POV Team, and you give her your 
complete blessing.
Taps a.k.a. Tapio Vocadlo


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From: Alain
Subject: Re: [Noob] Camera help
Date: 21 Jun 2007 17:38:47
Message: <467aefe7$1@news.povray.org>
Caligula nous apporta ses lumieres en ce 2007/06/21 09:59:
> I can't get the camera to go where I want it to go, when I put in
> coordinates, it always ends up being rotated. What am I doing wrong (or
> what should I be doing right)?
> 
> 
Here are the parameters of a default camera:
camera{
	location <0,0,0>
	right 4/3
	up <0,1,0> // can be shortened to up y
	direction <0,0,1>// can be shortened to direction z
	sky y
}
If you place it on the y axis and look along it, it can get confused. A 
workaround would to place it at the same distance but along the -z axis then 
rotate 90*x to bring it on the +y axis.
Instead of using:
camera{location 10*y look_at -y} or camera{location 10*y direction -y}
use:
camera{location -10*z rotate 90*x}

You may confuse the axis system: +x is toward the right, +y is up (vertical) and 
+z is away (horizontal).

-- 
Alain
-------------------------------------------------
Don't cry because it is over, smile because it happened.


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From: Warp
Subject: Re: [Noob] Camera help
Date: 22 Jun 2007 06:47:01
Message: <467ba8a5@news.povray.org>
Just add a "translate <your coordinates>" at the end of the camera
block. Much simpler.

-- 
                                                          - Warp


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From: Caligula
Subject: Re: [Noob] Camera help
Date: 24 Jun 2007 03:20:01
Message: <web.467e1b147b36d3efc573be920@news.povray.org>
Wow, thanks everybody for the help, but I figured out what my problem was.

I hadn't specified the sky correctly, so it would end up pointing funny
directions.


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From: Alain
Subject: Re: [Noob] Camera help
Date: 24 Jun 2007 09:09:04
Message: <467e6cf0@news.povray.org>
Caligula nous apporta ses lumieres en ce 2007/06/24 03:19:
> Wow, thanks everybody for the help, but I figured out what my problem was.
> 
> I hadn't specified the sky correctly, so it would end up pointing funny
> directions.
> 
> 
> 
You usualy don't need to define the sky vector, the default of +y is normaly 
good for any cases.
The same hold true for the up vector.

-- 
Alain
-------------------------------------------------
I find the affluence of incahol to be totally, whatever he said


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