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Why is it that when I increase the radius and falloff of a spotlight at
a certain point well before 90 degrees the light appears the same;
version is 3.1g.watcom.win32. It was my understanding that both radius
and falloff could range up to 90 degrees.
#version 3.1;
global_settings { assumed_gamma 2.2 }
camera {
location <0, 1, -3>
look_at <0, 1, 0>
}
light_source {
<-2, 1, 0>
rgb 1
spotlight
point_at <-2, 1, 6>
radius 60
tightness 50
falloff 65
}
light_source {
<2, 1, 0>
rgb 1
spotlight
point_at <2, 1, 6>
radius 30
tightness 50
falloff 35
}
plane {
z, 6
hollow on
pigment { rgb 1 }
}
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Attachments:
Download 'spot.jpg' (2 KB)
Preview of image 'spot.jpg'
![spot.jpg](/povray.newusers/attachment/%3C387313FF.29241650%40mscsoftware.com%3E/spot.jpg?ttop=440477&toff=2900&preview=1)
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I don't see the same thing. Perhaps if you rendered larger you would see a
difference.
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TonyB wrote:
>
> I don't see the same thing. Perhaps if you rendered larger you would see a
> difference.
I bumped it up to:
light_source {
<-2, 1, 0>
rgb 1
spotlight
point_at <-2, 1, 6>
radius 80
tightness 50
falloff 85
}
light_source {
<2, 1, 0>
rgb 1
spotlight
point_at <2, 1, 6>
radius 20
tightness 50
falloff 25
}
A angle difference of 60 degrees!! I rendered it at 640x480 and the
spots on the wall look the same size to me. What do you see?? I mean
you can simply sketch it out on graph paper and see that a line at 80-85
degrees should hit a lot farther out than a line 20-25 degrees.
As a matter of fact, if I'm not mistaken the radius of a spot at a
distance of 6 units and angle of 20 degrees should be 13.422... units in
radius. A spot from an angle of 80 degrees at the same distance should
be 54.021... units in radius.
- Jerome
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Attachments:
Download 'spot2.jpg' (2 KB)
Preview of image 'spot2.jpg'
![spot2.jpg](/povray.newusers/attachment/%3C38745493.F7260118%40mscsoftware.com%3E/spot2.jpg?ttop=440477&toff=2900&preview=1)
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Could be the texture on the plane you're using to shine them on and only
getting a diffuse or specular appearance, not actual illumination.
I know the angle does change the size. You might want to use 'tightness 0'
to use full broadness of them for this test too.
Bob
"Jerome Waters" <hjw### [at] mscsoftware com> wrote in message
news:38745493.F7260118@mscsoftware.com...
>
>
> TonyB wrote:
> >
> > I don't see the same thing. Perhaps if you rendered larger you would see
a
> > difference.
>
> I bumped it up to:
>
> light_source {
> <-2, 1, 0>
> rgb 1
> spotlight
> point_at <-2, 1, 6>
> radius 80
> tightness 50
> falloff 85
> }
> light_source {
> <2, 1, 0>
> rgb 1
> spotlight
> point_at <2, 1, 6>
> radius 20
> tightness 50
> falloff 25
> }
>
> A angle difference of 60 degrees!! I rendered it at 640x480 and the
> spots on the wall look the same size to me. What do you see?? I mean
> you can simply sketch it out on graph paper and see that a line at 80-85
> degrees should hit a lot farther out than a line 20-25 degrees.
>
> As a matter of fact, if I'm not mistaken the radius of a spot at a
> distance of 6 units and angle of 20 degrees should be 13.422... units in
> radius. A spot from an angle of 80 degrees at the same distance should
> be 54.021... units in radius.
>
> - Jerome
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Thanks Bob.
- Jerome
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