You don't need expressions. The rotation can be corrected with a
create_transform node:
1) Render > [Render] Render > Pass Options...
2) In the pass PPG, click the Environment's "Add" button and choosing
"Environment" shader from the popup dialog. Double click the shader to inspect
in a PPG.
- choose your image
- adjust shader settings as desired.
3) Open scene explorer and press "U" to inspect the current pass.
4) Select the "Environment" property under the pass root.
5) Press "7" to open the rendertree. You should see the blue "Environment"
shader connected to the orange current Pass. Your image clip should be
connected to the "tex" input of the environment shader.
6) From the shader presets, click and drag Processing > Math > Create_transform
into the rendertree workspace. Connect its output to the "transform" input of
the environment shader.
- adjust transform as desired.
Matt
-----Original Message-----
From: softimage-boun...@listproc.autodesk.com
[mailto:softimage-boun...@listproc.autodesk.com] On Behalf Of Nancy Jacobs
Sent: Tuesday, June 24, 2014 2:27 PM
To: softimage@listproc.autodesk.com
Subject: Re: Ideas for star fields?
Good point, if I use expressions to correct the rotation problems re the
environment map and any SI world null rotation parameters... They have to be
connected in a strange manner, at least as of 2014. Don't imagine they've fixed
that...
Thanks,
Nancy
On Jun 24, 2014, at 1:22 PM, Matt Lind <ml...@carbinestudios.com> wrote:
> If you're just going to create a sphere with specks on it, why don't you use
> an environment shader? That does the same work without having to create a
> sphere, deal with camera rigs, or mess up your ray depth computations in the
> render.
>
>
> Matt
>
>
>
>
>
>
>
> -----Original Message-----
> From: softimage-boun...@listproc.autodesk.com
> [mailto:softimage-boun...@listproc.autodesk.com] On Behalf Of
> Ponthieux, Joseph G. (LARC-E1A)[LITES]
> Sent: Tuesday, June 24, 2014 6:25 AM
> To: softimage@listproc.autodesk.com
> Subject: RE: Ideas for star fields?
>
> Oh and one other thing. You may find that constraining the star field sphere
> position directly to your camera and forcing the sphere orientation to remain
> in sync with the scene will produce the best results. Render the stars out as
> a pass and comp everything over them as the base image. By doing this the
> "stars" will always maintain an exact distance from the camera and since
> stars are such an incredible distance from us in space the illusion is
> remarkably similar. It will also make the appearance of the stars much more
> predictable as you can set them for what you want and you no longer have to
> worry about that appearance changing other than camera orientation.
>
> --
> Joey Ponthieux
> LaRC Information Technology Enhanced Services (LITES) Mymic Technical
> Services NASA Langley Research Center
> __________________________________________________
> Opinions stated here-in are strictly those of the author and do not represent
> the opinions of NASA or any other party.
>
>
>> -----Original Message-----
>> From: softimage-boun...@listproc.autodesk.com [mailto:softimage-
>> boun...@listproc.autodesk.com] On Behalf Of Ponthieux, Joseph G.
>> (LARC- E1A)[LITES]
>> Sent: Tuesday, June 24, 2014 9:13 AM
>> To: softimage@listproc.autodesk.com
>> Subject: RE: Ideas for star fields?
>>
>> The problem is that you are using Hubble images. Hubble images are
>> high res and beautiful but often are only representative of a single
>> focal point in space. What you want is a "star map" that is a
>> cylindrical projection suited for your sphere. You will find the maps
>> you need at this link. In particular the high res Tycho maps are probably
>> what you want.
>>
>> http://svs.gsfc.nasa.gov/vis/a000000/a003500/a003572/
>>
>> When you map these onto your sphere you will notice that the center
>> of your sphere of the focal point of a "disc" or "ring" of stars.
>> You'll see the "ring" form on the inner side of the sphere. There
>> were three maps historically, Tycho, Hipparcos, and Yale. The
>> following links contain them but these do not look like the highest res
>> versions.
>>
>> http://www.nasa.gov/multimedia/3d_resources/assets/tycho8.html
>>
>> http://www.nasa.gov/multimedia/3d_resources/assets/hipp8.html
>>
>> http://www.nasa.gov/multimedia/3d_resources/assets/yale8.html
>>
>>
>> Each was created at different resolutions and star counts. One is
>> synthetic I think, and that I believe is the Yale map based upon the
>> Tycho catalog. The map is of higher contrast and may lack a lot of
>> the intermediate or diminished stars so it may be useful in some
>> circumstances. You'll have to figure out what the basic appearance is
>> that you are looking for and a combination of the maps may be what
>> you want. As you probably have already discovered, you won't be able to let
>> your camera get too close to the texture surface as
>> the stars will become abnormally large and the illusion will be lost. Its
>> best if
>> you scale the sphere as large as you can and keep the surface as far
>> from the camera as possible to reach the effect you want.
>>
>> If you want a moving starfield, the best way to achieve that is
>> generate a massive field of small triangles set to constant white.
>> The distance apart, size, and randomness will have to be worked out.
>> You can do this as particles as well, but if the particles are set to
>> pixel height you'll lose the sense of perspective and distance as you fly
>> through them.
>>
>> --
>> Joey Ponthieux
>> LaRC Information Technology Enhanced Services (LITES) Mymic Technical
>> Services NASA Langley Research Center
>> __________________________________________________
>> Opinions stated here-in are strictly those of the author and do not
>> represent the opinions of NASA or any other party.
>>
>>> -----Original Message-----
>>> From: softimage-boun...@listproc.autodesk.com [mailto:softimage-
>>> boun...@listproc.autodesk.com] On Behalf Of Nancy Jacobs
>>> Sent: Monday, June 23, 2014 5:43 PM
>>> To: Softimage Listserve
>>> Subject: Ideas for star fields?
>>>
>>> Hello,
>>>
>>> I'm needing a star field kind of background for a scene, and looking
>>> for
>> ideas
>>> to create it. I have been using Hubble images wrapped around a
>>> sphere, around the scene, but I'm finding it doesn't read well, even
>>> with very high- res Hubble images.
>>>
>>> So, I'm wondering about other ways to create star fields. Has to be
>>> 360 degrees, seamlessly -- and I don't have the capability to deal
>>> with that in a compositing situation.
>>>
>>> So....any ideas?
>>>
>>> Thanks,
>>> Nancy
>
>
>
