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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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Fire&Light
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1998-02-16
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Date: Sun, 1 Feb 1998 10:03:49 -0500
From: Michael Murray <mojo@dnet.net>
Subject: [IML] IFW
Hi gang,
This is kinda long so bear with me. I'm doing a medieval castle type
room with stone walls, wood floor and a fire place in one end. I've
placed a table with two candles in the scene and I want my light to come
from the two candles and the fireplace. I created my fireplace fire by
adding a disk, deleting half of it so I have a fan shape and then
tweaking the points to get a jagged edge. I then added the fire texture
and made it a light source (point source). It actually looks pretty
good. The problem is that I can't get the light to behave properly. With
the fire objects y axis pointed toward the back of the fireplace I don't
get any light cast into the room although I was under the impression
that a point source light cast it's light in all directions. When I
rotate it so the Y axis is pointing out into the room my floor and table
top look very speckled. I'm assuming this is due to the fact that I made
the table and floor somewhat shiny to get the look of polished wood and
the low angle of my light source from the fireplace. Oddly enough, when
rendered in scanline mode it looks a lot more like what I had in mind.
I've also tried the fireball texture and I couldn't get that to work
properly either.
Sorry for the long winded post.
---------------------------------
Date: Mon, 2 Feb 1998 05:53:42 -0500
From: gregory denby <gdenby@TWAIN.HELIOS.ND.EDU>
I'd guess from your description the fireplace light casts shadows, and
that the floor and table are slightly bumpy. If so, yes, your assumption
about the low angle from the light source is correct. The reason that
scanline looks more like what you intended is the fact that there are no
shadows, and so everything looks a bit brighter.
You can easily fix up your scene by adding a number of axes in front of the
fireplace, and make them low intensity and non-shadow casting. You may want to
make them directional, so they more or less only cast light out into the
room. This should lessen the low light angle problem, and give a better
ambient effect.
Consider this, almost every real source of illumination is not a point
source. When you try and imitate reality with Imagine, you need to add
many small lights for a diffuse effect.