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Time Now, for Dawn's Stupid Questions!
Last night, as I sat at the table with the cousins, playing D&D, I was
also working with POV on my laptop. One of the cousins said "Hey, cool,
can you make me a lightsabre?"
So I hemmed and hawed for a moment, and came up with a way to do it. I
CSG merged a sphere on the end of a cylinder, filled the cylinder with
emitting media, did a cylindrical pattern with a density color_map to
create the blade, and discovered something kind of odd...
If I do a color_map [0.0 color White ][0.5 color Green ] [1.0 color
Black], and I have a black background, I get pretty much exactly what I
expect to see... a white core, with the green color around the 'blade,'
and both of them fade into each other, and then into extinction. As I
say, what I expect to see, and a pretty good image of a lightsabre blade.
But (and I did this first, found it didn't work as expected, and went
with the above solution) if I substitute "color Clear" for "color Black"
in the color_map, I get an object that appears clear all the way through!
Why do it do that? How can I make it not? Source code posted in p.t.scene-files.
--
Dawn McKnight | "Who cares what the hipbone's connected to? I'm in Neurology!"
McK### [at] mac com | -- Justine Devlin, M.D.
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Dawn McKnight wrote:
> Time Now, for Dawn's Stupid Questions!
No question is stupid IMHO
> If I do a color_map [0.0 color White ][0.5 color Green ] [1.0 color
> Black]
Firstly in the source you posted it is the other way round (but correct)
[0.0 color Black filter 1] [0.5 color Cyan filter 1] [1.0 color White filter 1]
> But (and I did this first, found it didn't work as expected, and went
> with the above solution) if I substitute "color Clear" for "color Black"
> in the color_map, I get an object that appears ???clear??? all the way through!
I get (official3.1 & WMP0.6a) an object that is white with a little cyan noise
> Why do it do that? How can I make it not? Source code posted in p.t.scene-files.
Could be to do with the fact that in colors.inc #declare Clear = rgbf 1;//White with
a filter of 1
I don't think media uses the filter/transmit value & it doesn't affect the results I
got
So basically you might as well be using
[0.0 color White] [0.5 color Cyan] [1.0 color White]
instead of
[0.0 color Clear] [0.5 color Cyan] [1.0 color White]
Hope that helps
--
Bye
Pabs
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If you look through p.b.images about 1 1/2 years ago(not long before
Star Wars Episode 1 came out) you'll find a bunch of lightsabre attempts
by a few different people including myself(I did an Obi-Wan). I still
have the file if you'd like to check it out.
--
Phil
...coffee?...yes please! extra sugar,extra cream...Thank you.
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Phil Clute wrote:
>
> I still have the file if you'd like to check it out.
That'd be great, Phil, Thanks. I don't know where to look for messages
from 1.5 years ago; I think they expire from the server before that?
--
Dawn McKnight | "Who cares what the hipbone's connected to? I'm in Neurology!"
McK### [at] maccom | -- Justine Devlin, M.D.
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Dawn McKnight wrote:
> I think they expire from the server before that?
Messages on this server do not expire except in the off topic group.
Messages are also trimmed occassionally from the .images group and
in the binaries.animations group to create new space on the servers
hard drive for new messages. However the scene files groups have
never been trimmed and everything ever posted there should still
be available unless cancelled by the original poster.
--
Ken Tyler - 1400+ POV-Ray, Graphics, 3D Rendering, and Raytracing Links:
http://home.pacbell.net/tylereng/index.html http://www.povray.org/links/
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> That'd be great, Phil, Thanks.
I'll put it in povray.text.scene-files as LS_ObiWan. You'll have
to put +w120 +h480 on the command line to set the image size
unless you want to change the camera settings.
--
Phil
...coffee?...yes please! extra sugar,extra cream...Thank you.
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There are 2 lightsabres on my site... But no source yet...
I'll search the source-files, and post them in p.t.s-f
--
ZK
http://www.povplace.be.tf
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Phil Clute wrote:
> I'll put it in povray.text.scene-files as LS_ObiWan.
That's cool, Phil; thanks a lot for sharing it. I don't know if I
would've thought of doing a union of media-containing objects like that,
so you've taught me something new. Thanx.
--
Dawn McKnight | "Who cares what the hipbone's connected to? I'm in Neurology!"
McK### [at] maccom | -- Justine Devlin, M.D.
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> you've taught me something new. Thanx.
Glad to help.
--
Phil
...coffee?...yes please! extra sugar,extra cream...Thank you.
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"Dawn McKnight" <mck### [at] maccom> wrote in message
news:3A25DDD4.A47D21CE@mac.com...
<SNIP>
I think the basic problem is that you need to use an absorbing media as well
as an emmitting one.
The emmitting media shows up nicely against a dark background, but is washed
out by a coloured one (try looking at a glow-in-the-dark decal in broad
daylight).
By adding an absorbing media that is the opposite colour to your emitting
media you should get the effect you're after.
Hope this helps.
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