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High!
Originally, I intended to reveal this only at a more advanced stage...
but I got stuck with the shadows. I aimed at blurred shadows for the two
lines of text, so I used a fairly large area_light made up of 50 by 50
single lights. But then I found it very difficult if not impossible to
make them *really* blurred - if I just enlarge the area light, shadows
become thinner and thinner until they disappear completely, which is
just logical. On the other hand, increasing the number of single lights
does not help either, it just bogs down the CPU. Even at these
comperatively moderate settings, the shadows of the lower line disappear...
Is there a way to blur shadows without post-processing at all?
See you in Khyberspace!
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Attachments:
Download 'povearth-title.jpg' (23 KB)
Preview of image 'povearth-title.jpg'
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If you have too much light hitting that back plane, it will drown out the
soft shadows.
Set the plane's ambient to 0 and diffuse to 1 in the finish{} block. Then
make sure your only light source is the area_light (if you want other light
sources on the text, put them in a light_group with the text). Set the
area_light's color to rgb 1, and if the direction to the area light from the
part of the plane we're looking at is about perpendicular to the plane, this
will cause a near perfect transition from white to black on the soft
shadows.
You may then want to raise ambient and decrease diffuse (keep them adding up
to 1 to keep the background white) to make the shadows lighter.
Also make sure you have circular and orient set in the area light.
- Slime
[ http://www.slimeland.com/ ]
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A different technique for achieving blurred shadows would be to use
radiosity. Its quite hard to make a point light produce fuzzy shadows.
On the other hand, its quite hard for radiosity to produce razor sharp
shadows. Try lighting your scene with pure radiosity with an ambient
box replacing the area light. If you keep the error bound high, say 1
or so, the shadowed areas should be more than blurred. This method will
require much more tweaking than conventional lighting but I think you
can definitely achieve what you are after.
Skip
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> High!
>
> Originally, I intended to reveal this only at a more advanced stage...
> but I got stuck with the shadows. I aimed at blurred shadows for the two
> lines of text, so I used a fairly large area_light made up of 50 by 50
> Is there a way to blur shadows without post-processing at all?
>
> See you in Khyberspace!
>
For this case, maybe place your plane far behind, and use focal blur ?
Post a reply to this message
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light_source {
LOCATION_VECTOR, COLOR
area_light
AXIS_1_VECTOR, AXIS_2_VECTOR, Size_1, Size_2
[adaptive Adaptive] [ jitter ]
[ circular ] [ orient ]
[ [LIGHT_MODIFIERS...]
}
try to raise the value of AXIS_1_VECTOR and AXIS_2_VECTOR.
What values are you using? And what's the distance of your light source to
the object?
Wagner
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High!
Wagner wrote:
> try to raise the value of AXIS_1_VECTOR and AXIS_2_VECTOR.
I tried this before... but now, with the diffuse value downed as
recommended by Slime (which yielded a promising result), I would try it
once again!
See you in Khyberspace!
Yadgar
Now playing: In the Beginning (Genesis)
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> High!
>
> Originally, I intended to reveal this only at a more advanced stage...
> but I got stuck with the shadows. I aimed at blurred shadows for the two
> lines of text, so I used a fairly large area_light made up of 50 by 50
> single lights. But then I found it very difficult if not impossible to
> make them *really* blurred - if I just enlarge the area light, shadows
> become thinner and thinner until they disappear completely, which is
> just logical. On the other hand, increasing the number of single lights
> does not help either, it just bogs down the CPU. Even at these
> comperatively moderate settings, the shadows of the lower line disappear...
>
> Is there a way to blur shadows without post-processing at all?
I've found that using the area_light with jitter turned on, and with
anti-aliasing set in the render will produce a soft shadow. For speed
use the adaptive option in the area_light. This may produce splotching,
which you can reduce by raising the adaptivity level.
Regards,
John
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