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Op 22/12/2019 om 02:14 schreef AndreyG:
> Thank you for your explanation Thomas,
>
> So you are saying in real life if I place glass perpendicularly to Sun rays and
> camera axis will be perpendicular to glass surface there always be reflection?
> (Can not do experiment it is raining for a week in Vancouver! :).
Real life is not raytracing! and I cannot answer you for the real life
situation (I leave that to my betters). But I guess that you better not
look into the glass in such a set-up if you want to keep your vision
intact. ;-)
>
> I am total newbe with Povray trying to make sense of it.
> I have another question can not grasp.
> I make simplest geometry: camera and spotlight.
> Spotlight points at camera, camera looks at spotlight.
> For whatever reason camera does not see the light.
> https://imgur.com/a/xeJ3Ykm
> Can't find what i am doing wrong.
>
Again, raytracing does not work exactly like real life. A spotlight or
any light in POV-Ray, is not physically "shinning" like a lamp, it needs
an object to shine upon, and a camera, by itself, is not an "object"
either. Well, I hope I tell this right; if not, someone will correct me
I am sure.
Try this:
//--------------------------------------------------------
#version 3.7;
global_settings {
assumed_gamma 1.0
}
// perspective (default) camera
camera {
location <0.0, 0.0, -10.0>
look_at <0.0, 0.0, 0.0>
right x*image_width/image_height
angle 70
}
// create a point "spotlight" (conical directed) light source
light_source {
<200, 100, 100>
color rgb <1,1,1>
spotlight
point_at <0, 0, 0>
radius 50
tightness 5
falloff 8
}
// linear prism in z-direction: from ,to ,number of points (first = last)
prism {
-1.00 ,1.00 , 6
<-1.00, 0.00>, // first point
< 1.00, 0.00>,
< 1.00, 1.00>,
< 0.00, 2.00>,
<-1.00, 1.00>,
<-1.00, 0.00> // last point = first point!!!!
rotate<-90,0,0> scale<1,1,-1> //turns prism in z direction! Don't
change this line!
texture {pigment{ color rgb 1 }}
scale <1.00,1.00,1.00>
rotate <0,30,0>
translate <0.00,0.00,0.00>
} // end of prism //--------------------------------------------------------
If you are new to POV-Ray, I suggest you read carefully the
documentation (I know! it is huge but it is worthwhile!) and play with
the many example scenes given. You will discover that a new world and
new insights will be revealed to you :-)
http://wiki.povray.org/content/Main_Page
And of course, do not hesitate to call here. We are a helpful bunch of
guys/girls (not heard much of the latter unfortunately...)
--
Thomas
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