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EnigmA Amiga Run 1998 July
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EnigmA AMIGA RUN 29 (1998)(G.R. Edizioni)(IT)[!][issue 1998-07 & 08].iso
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Magnifying_Glass
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1998-06-21
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Date: Wed, 3 Jun 1998 00:07:18 +0400
From: Charles Blaquiere <blaq@INTERLOG.COM>
Subject: Re: [IML] WEB, QUEST: New Website
Lars Fresk wrote:
>
> For a short animation I'm using a magnifying glass object moving
> over a picture and I can't get the light and shadows working the way I want.
What way do you want it? Is it that you want light to be concentrated by
the convex object, for example? I can't help you in that case. If your
problem is that the shadows are too flat, I have a suggestion.
The Fresnel effect has been discussed on the IML these past few days. On
a glass object, it makes the glass more reflective and less transparent
as the surface angles away from the camera. To reproduce this in
Imagine, use the Fakely texture twice, once for filter and once for
reflect. I have set mine like this:
REFLECT: front = 31, 31, 31
side = 160,160,160
FILTER: front = 175,200,225
side = 30, 55, 65
The result was a set of shadows that became darker, the further away
from the center. The improvement over the flat shadows was striking.
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Date: Thu, 4 Jun 1998 00:19:44 +0100
From: Lars Fresk <l-fresk@ALGONET.SE>
Your suggestion to use Fakley on the glass object, is a big improvement
on the shadows. I assume you are using ABFakley, thats a problem for me
because I'm using IFA. Instead I'm using Filtermaps and that seems to
work ok. I'm doing some test renderings now and it looks good.
For the focus spot of light, I'm using a round point light source
with controlled falloff. This gives me a light-cone with the y-axis pointing
towards the plane. When I move the light-cone closer to the plane the spot of
light gets smaller and brighter (more focused). I then associate the lightcone
to the lens object. Scott Sutherland helped me with this tip.
Thanks for the help
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