POV-Ray : Newsgroups : povray.general : Light from a mirror Server Time: 23 Mar 2019 07:07:11 GMT
  Light from a mirror (Message 1 to 4 of 4)  
From: Roland Mösl
Subject: Light from a mirror
Date: 2 May 2018 13:40:26
Message: <5ae9bfca$1@news.povray.org>
In a construction project of mine a glare report is necessary, whether 
the photovoltaic on the roof can reflect light in an adjacent nature 
reserve.

This is what I want to do with POVRAY myself.

Enter the photovoltaic as a mirror, simulate the sun's run, and then see 
if any of the pictures shows reflected light from the mirror to the 
surrounding ground.

Is there any setting in POVRAY where it is calculated whether a point is 
not only illuminated directly by one of the defined light sources, but 
also checkes whether a ray of light hits the point via surfaces defined 
as mirrors?



-- 
Roland Mösl - PEGE - http://www.pege.org
Planetary Engineering Group Earth


Post a reply to this message

From: David Buck
Subject: Re: Light from a mirror
Date: 2 May 2018 14:48:00
Message: <5ae9cfa0$1@news.povray.org>
I think the Photons option of POVRay does what you want.

David Buck

On 2018-05-02 9:40 AM, Roland Mösl wrote:
> In a construction project of mine a glare report is necessary, whether 
> the photovoltaic on the roof can reflect light in an adjacent nature 
> reserve.
> 
> This is what I want to do with POVRAY myself.
> 
> Enter the photovoltaic as a mirror, simulate the sun's run, and then see 
> if any of the pictures shows reflected light from the mirror to the 
> surrounding ground.
> 
> Is there any setting in POVRAY where it is calculated whether a point is 
> not only illuminated directly by one of the defined light sources, but 
> also checkes whether a ray of light hits the point via surfaces defined 
> as mirrors?
> 
> 
>


Post a reply to this message

From: clipka
Subject: Re: Light from a mirror
Date: 2 May 2018 14:54:03
Message: <5ae9d10b$1@news.povray.org>
Am 02.05.2018 um 15:40 schrieb Roland Mösl:

> Is there any setting in POVRAY where it is calculated whether a point is
> not only illuminated directly by one of the defined light sources, but
> also checkes whether a ray of light hits the point via surfaces defined
> as mirrors?

The feature you're probably looking for is "photon mapping": In essence,
you'd tell POV-Ray: "Look what happens to light that hts this mirror",
and POV-Ray would take into account such reflected light.

To this end, you'd have to enable photon mapping /per se/, and define
the mirror as a "photon target".


Post a reply to this message

From: Alain
Subject: Re: Light from a mirror
Date: 2 May 2018 22:55:45
Message: <5aea41f1@news.povray.org>
Le 18-05-02 à 09:40, Roland Mösl a écrit :
> In a construction project of mine a glare report is necessary, whether 
> the photovoltaic on the roof can reflect light in an adjacent nature 
> reserve.
> 
> This is what I want to do with POVRAY myself.
> 
> Enter the photovoltaic as a mirror, simulate the sun's run, and then see 
> if any of the pictures shows reflected light from the mirror to the 
> surrounding ground.
> 
> Is there any setting in POVRAY where it is calculated whether a point is 
> not only illuminated directly by one of the defined light sources, but 
> also checkes whether a ray of light hits the point via surfaces defined 
> as mirrors?
> 
> 
> 

Use photons mapping with the following setup :
1) In the global_settings block, create a photons block
2) Set your mirror as a target with "reflection on" with an object level 
photons block
3) Make your Sun a spot light directed at the mirror
4) Make the ground white
5) Place the camera overhead looking down

In point 3, you confine the light to only the mirror, plunging the rest 
of the scene into darkness. This will make the area illuminated by the 
reflected light stand out.
To see the path of the reflection, you can create an animation where the 
Sun follow it's normal path for the location.
You can use ambient in the finish of your ground or some fill light if 
you want to see more of the ground.


Post a reply to this message

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