Paint a greyscale image, use it as a texture map it onto geo, and use
it as an emission map under the emitter's rate.
You will probably need to generate a lot of them to get the desired
effect, but it will work If you wnat a more 3D effect, put a little
speed on the emission with a high varience. Once it looks good
enough, freeze it.
E
Freelance 3-D Animator, F/X Artist
----- Original Message ----
From: Adrian Lopez <liquidlightdigital(at)gmail.com>
To: XSI(at)Softimage.COM
Sent: Wednesday, January 10, 2007 9:50:55 PM
Subject: Re: Starfield Environment Shader
Nice suggestion, Joe - I gave it a shot - and it sort of works.
There's a lack of control, however, that I find unsettling. I cant
model concentrations of stars, or control the spread in other areas of
the sky. I suppose you could use textures or weight maps to control
the emission - but God, its such a struggle.
On 1/10/07, *Joe Laffey* <joe(at)laffey.tv <mailto:joe(at)laffey.tv>> wrote:
On Wed, 10 Jan 2007, Wayne Williams wrote:
> I didn't know single point polys existed. Don't you have to have at
> least 3 for it to be considered a polygon? Otherwise it's a point or
> line ya?
Technically yes, given the etomology of the word (many angles).
I would guess the OP has come from LightWave where there is
support for
render single point polygons (which are a distinct entity from
points) as
pixels. They work quite well for stars.
As far as making stars in XSI what about making a very large
sphere set to
emit particles with speed 0 in its volume.
Like this:
CreatePrim "Sphere", "MeshSurface"
CreateParticleCloud "sphere"
SetValue "cloud.cloud.ParticlesOp.sphere_emission.Generation", 3
SetValue "cloud.cloud.ParticlesOp.sphere_emission.Speed", 0
SetValue "cloud.cloud.ParticlesOp.sphere_emission.Rate ", 20000
NextFrame
Then set an initial state, or have the rate drop to 0, or
export/import
etc.
Then you use one of the particle shaders to get stars, you can
even give
them random colors, and random scales, which tend to look very
good for
stars.
--
Joe Laffey | Visual Effects for Film and Video
LAFFEY Computer Imaging | -------------------------------------
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USA | -------------------------------------
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