POV-Ray: Newsgroups: povray.general: Area light axes

POV-Ray : Newsgroups : povray.general : Area light axes		Server Time 1 Nov 2024 07:26:19 EDT (-0400)

From: Mike Horvath
Subject: Area light axes
Date: 14 Jan 2016 19:45:00
Message: <5698410c$1@news.povray.org>

Let's say I have an linear area light that is supposed to be 20 units 
long from one end to the other along the Z axis. What value do I put in 
for AXIS_1_VECTOR? Do I put "z * 20" or "z * 10"? Do the vectors start 
from the middle of the area light or from the edges? Thanks.


Mike

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From: clipka
Subject: Re: Area light axes
Date: 14 Jan 2016 20:05:55
Message: <569845f3$1@news.povray.org>

Am 15.01.2016 um 01:45 schrieb Mike Horvath:
> Let's say I have an linear area light that is supposed to be 20 units
> long from one end to the other along the Z axis. What value do I put in
> for AXIS_1_VECTOR? Do I put "z * 20" or "z * 10"? Do the vectors start
> from the middle of the area light or from the edges? Thanks.

The length of the axis vectors specifies the total size of the area
light in the respective direction, so you should use z*20.

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