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Hi,
Very infrequent poster here...
Well unfortunately I didn't get round to entering in the IRTC space competition
because of various factors, but I recently got round to finishing up one of the
elements I had planned to include in the scene, and turned it into a quick
animation.
This is a render of a contact binary system of the W Ursae Majoris type. Two
objects are used: an isosurface representing the common photosphere of the
binary stars, and a second container object holding three separate media for the
lower atmosphere (some kind of analogue to the chromosphere I guess) and the two
coronae.
I haven't gotten around to animating the photosphere texture - would be handy to
have some possibility of extending the procedural textures into the 4th
dimension for animations.
Post a reply to this message
Attachments:
Download 'wuma.mpg' (656 KB)
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> This is a render of a contact binary system of the W Ursae Majoris type.
looks sleek! I'm not sure I'm getting the animation at the
intended aspect ratio though, both stars seem very elongated.
I think they should be more shaped like droplets, with the outer
halfs being mostly round, as in this roche lobe diagram:
http://www.airynothing.com/high_energy_tutorial/sources/binaries.html
Also, they might be a bit too close and uniformly merged.
I think they would touch with a thinner streak of streaming
material which probably also looks different from the star.
> I haven't gotten around to animating the photosphere texture - would be handy to
> have some possibility of extending the procedural textures into the 4th
> dimension for animations.
The textures are really nice! For animating them you can
try the phase keyword (and set it based on the clock), that
will basically cycle through your color_maps.
Post a reply to this message
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"ajtribick" <nomail@nomail> wrote:
> I haven't gotten around to animating the photosphere texture - would be handy to
> have some possibility of extending the procedural textures into the 4th
> dimension for animations.
I, too, would be interested in this. I vaguely recall it coming up a long time
ago, someone's idea for a 4d perlin noise patch. I am not sure how much
tinkering that would take but it seems like it would require quite a bit. To
extend the current 3d procedural textures implies that the current system for
handling texture transformations would also have to be extended. I don't know
if that means the current coordinate system would have to be extended, but doing
so would open some doors to some very nifty effects, particularly if someone
wanted to easily do visualizations of rotating hypercubes.
-Reactor
Post a reply to this message
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Christian Froeschlin <chr### [at] chrfr de> wrote:
> looks sleek! I'm not sure I'm getting the animation at the
> intended aspect ratio though, both stars seem very elongated.
> I think they should be more shaped like droplets, with the outer
> halfs being mostly round, as in this roche lobe diagram:
>
> http://www.airynothing.com/high_energy_tutorial/sources/binaries.html
In fact I am actually using the Roche potential for the isosurfaces. The
elongation did surprise me at first (I encountered this when I generated models
of these for an add-on to the Celestia space simulator), but as far as I can
tell it does seem to be a feature of this potential.
On the other hand, this shape does not represent a real binary: effectively I am
modelling the system as a massless fluid surrounding two point masses in
Keplerian orbit. Since the real stars have a distribution of mass, the actual
shape would change. However modelling this accurately is going to be a
nightmare... I'd want at least a PhD at the end of all that. :-)
Anyway, just in case you are getting aspect ratio distortion, I've attached a
render of the first frame, albeit with toned-down coronae.
> Also, they might be a bit too close and uniformly merged.
> I think they would touch with a thinner streak of streaming
> material which probably also looks different from the star.
Judging by the catalogue of contact binaries at
http://www.mporzio.astro.it/~maceroni/wumacat.html there seem to be a wide range
of fill-out factors - this rendering is based on RW Comae Berenices which has
quite a high fill-out factor. The idea of modifying the texture to put some
evidence of material flowing across the "neck" is a good one though.
Post a reply to this message
Attachments:
Download 'contactbinary.jpg' (37 KB)
Preview of image 'contactbinary.jpg'
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