POV-Ray : Newsgroups : povray.newusers : the concept of focus in povray? Server Time: 27 Jun 2019 03:58:23 GMT
  the concept of focus in povray? (Message 1 to 5 of 5)  
From: Lsq
Subject: the concept of focus in povray?
Date: 29 Mar 2016 03:55:01
Message: <web.56f9fc75d50d895f3fdf54d50@news.povray.org>
Hi,I have studied this soft for several days and have 2 questions:

1&#12289;which keyword is used to set the focus of perspective model carema?
look_at?direction? or others?
2&#12289;Besides&#65292;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!


Post a reply to this message

From: Thomas de Groot
Subject: Re: the concept of focus in povray?
Date: 29 Mar 2016 07:07:40
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&#12289;which keyword is used to set the focus of perspective model carema?
> look_at?direction? or others?
> 2&#12289;Besides&#65292;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


Post a reply to this message

From: Stephen
Subject: Re: the concept of focus in povray?
Date: 29 Mar 2016 07:19:25
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&#12289;which keyword is used to set the focus of perspective model carema?
> look_at?direction? or others?
> 2&#12289;Besides&#65292;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


Post a reply to this message

From: Lsq
Subject: Re: the concept of focus in povray?
Date: 29 Mar 2016 11:55:00
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&#12289;which keyword is used to set the focus of perspective model carema?
> > look_at?direction? or others?
> > 2&#12289;Besides&#65292;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~


Post a reply to this message

From: clipka
Subject: Re: the concept of focus in povray?
Date: 29 Mar 2016 15:04:28
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&#12289;which keyword is used to set the focus of perspective model carema?
> look_at?direction? or others?
> 2&#12289;Besides&#65292;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.


Post a reply to this message

Copyright 2003-2008 Persistence of Vision Raytracer Pty. Ltd.