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28 Mar 2024 14:28:56 EDT (-0400)
  the concept of focus in povray? (Message 1 to 5 of 5)  
From: Lsq
Subject: the concept of focus in povray?
Date: 28 Mar 2016 23:55:01
Message: <web.56f9fc75d50d895f3fdf54d50@news.povray.org>
Hi,I have studied this soft for several days and have 2 questions:

1、which keyword is used to set the focus of perspective model carema?
look_at?direction? or others?
2、Besides,when one focus of the carema is set,how can we ensure
that the objects of the image is clear under this focus?

I'm confused about this.Could anyone help me? Thanks!


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From: Thomas de Groot
Subject: Re: the concept of focus in povray?
Date: 29 Mar 2016 03:07:40
Message: <56fa29bc$1@news.povray.org>
On 29-3-2016 5:54, Lsq wrote:
> Hi,I have studied this soft for several days and have 2 questions:
>
> 1、which keyword is used to set the focus of perspective model carema?
> look_at?direction? or others?
> 2、Besides,when one focus of the carema is set,how can we ensure
> that the objects of the image is clear under this focus?
>
> I'm confused about this.Could anyone help me? Thanks!
>
>

Welcome to the club!

I suppose you are talking about focal blur and depth of field like in a 
Real Life camera. Basically, the cameras in POV-Ray are pinpoint 
cameras, i.e. they do not have a lens for focussing. As a result the 
scene is always sharp from foreground to background.

However, focal blur (or depth of field) can be simulated in POV-Ray. The 
best you can do presently imo, is to play with the example camera scenes 
that are present in the scenes/camera folder of POV-Ray. You will find 
there the focalblur.pov scene which you can use, besides all the other 
camera types of course.

-- 
Thomas


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From: Stephen
Subject: Re: the concept of focus in povray?
Date: 29 Mar 2016 03:19:25
Message: <56fa2c7d$1@news.povray.org>
On 3/29/2016 4:54 AM, Lsq wrote:
> Hi,I have studied this soft for several days and have 2 questions:
>
> 1、which keyword is used to set the focus of perspective model carema?
> look_at?direction? or others?
> 2、Besides,when one focus of the carema is set,how can we ensure
> that the objects of the image is clear under this focus?
>
> I'm confused about this.Could anyone help me? Thanks!
>
>
The centre of the zone of sharpness is specified by the focal_point vector.


-- 

Regards
     Stephen


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From: Lsq
Subject: Re: the concept of focus in povray?
Date: 29 Mar 2016 07:55:00
Message: <web.56fa6cccbb7237713fdf54d50@news.povray.org>
Thomas de Groot <tho### [at] degrootorg> wrote:
> On 29-3-2016 5:54, Lsq wrote:
> > Hi,I have studied this soft for several days and have 2 questions:
> >
> > 1、which keyword is used to set the focus of perspective model carema?
> > look_at?direction? or others?
> > 2、Besides,when one focus of the carema is set,how can we ensure
> > that the objects of the image is clear under this focus?
> >
> > I'm confused about this.Could anyone help me? Thanks!
> >
> >
>
> Welcome to the club!
>
> I suppose you are talking about focal blur and depth of field like in a
> Real Life camera. Basically, the cameras in POV-Ray are pinpoint
> cameras, i.e. they do not have a lens for focussing. As a result the
> scene is always sharp from foreground to background.
>
> However, focal blur (or depth of field) can be simulated in POV-Ray. The
> best you can do presently imo, is to play with the example camera scenes
> that are present in the scenes/camera folder of POV-Ray. You will find
> there the focalblur.pov scene which you can use, besides all the other
> camera types of course.
>
> --
> Thomas

Thanks a lot.I have found the focalblur.pov in the help file following your
advice~


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From: clipka
Subject: Re: the concept of focus in povray?
Date: 29 Mar 2016 11:04:28
Message: <56fa997c$1@news.povray.org>
Am 29.03.2016 um 05:54 schrieb Lsq:
> Hi,I have studied this soft for several days and have 2 questions:
> 
> 1、which keyword is used to set the focus of perspective model carema?
> look_at?direction? or others?
> 2、Besides,when one focus of the carema is set,how can we ensure
> that the objects of the image is clear under this focus?
> 
> I'm confused about this.Could anyone help me? Thanks!

The plane of focus is defined by specifying "focal_point VECTOR", where
VECTOR is a point on the desired plane of focus.

You will also need to specify "aperture FLOAT", where FLOAT is the
radius (or diameter? I keep forgetting) of the camera aperture. To give
a convincing sense of scale, it should be around the equivalent of 1 cm
in scene dimensions.

The "blur_samples", "confidence" and "variance" parameters can be used
to tweak render speed and quality.


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