It's about Venus

[Hungry4info]

I agree.

Have you considered making this public?

[MiR]

Thank you both for your friendly encouragement.

You know I'm an uneducated layperson in these things. I'm something like a "painter". Not more.
Therefore your comments are very helpful for me.

I've sent the .zip file up to CML just now.

I wish you - and everyone here - a Happy New Year!

Michael

[CAP-Team]

I still couldn't find your upload on CML, so could you please post your .SSC for Venus here?

[MiR]

Sorry. I have loaded it up (January, 3. 2011) via ftp. Without any failure message. Maybe I've done something wrong?

And maybe someone of the CML team can help?

Code: Select all

Modify "Venus" "Sol"
{
   Texture "venussurface.*"
   OverlayTexture "venus-atmosphere.*"
   NormalMap "VenusNormal.*"
   HazeColor [ 0.5 0.35 0.2 ]
   HazeDensity 0.35
   Radius 6052

   Atmosphere {
      Height 75
      Lower [ 1 0.82 0.70 ]
      Upper [ 0.71 0.79 0.4 ]
      Sky [ 0.48 0.6 0.5 ]
      Sunset [ 0.9 0.75 0.47 ]

      CloudMap "venusclouds.*"
      CloudHeight 54
      CloudSpeed  90
      CloudShadowDepth 1.0

      Mie 0.0031
      MieAsymmetry -0.21
      Rayleigh [ 0.001 0.0025 0.006]
      Absorption [ 0.00057 0.0004 0.0001] #  [ 0.00057 0.0004 0.0]
      MieScaleHeight 31   # 27
   }

   CustomOrbit "vsop87-venus"

   # Overridden by CustomOrbit
   # EllipticalOrbit
        # {
   #   Period            0.6152
   #   SemiMajorAxis     0.7233
   #   Eccentricity      0.0068
   #   Inclination       3.3947
   #   AscendingNode     76.681
   #   LongOfPericenter 131.533
   #        MeanLongitude    181.979
   # }

   BodyFrame { EquatorJ2000 {} }
   # CustomRotation "iau-venus"

   # IAU Venus definition is simple uniform rotation
   UniformRotation
   {
       Period       5832.443616
       Inclination   157.16
       AscendingNode 182.76
       MeridianAngle  19.80
   }

   Albedo            0.77
}

"" "Sol"
{
   HazeColor [ 0.5 0.35 0.2 ]
   HazeDensity 0.35
   Radius 6052

   Atmosphere {
      Height 182
      Lower [ 1 0.92 0.70 ]
      Upper [ 0.001 0.1 0.54 ]
      # Sky [ 0.48 0.4 0.9 ]
      Sunset [ 0.1 0.2 0.54 ]

   }

   CustomOrbit "vsop87-venus"



   BodyFrame { EquatorJ2000 {} }
   # CustomRotation "iau-venus"

   # IAU Venus definition is simple uniform rotation
   UniformRotation
   {
       Period       5832.443616
       Inclination   157.16
       AscendingNode 182.76
       MeridianAngle  19.80
   }

   Albedo            0.77
}


#####################################################################
lower density of the blue ice crystal haze:

      Mie 0.0031
      MieAsymmetry -0.21
      Rayleigh [ 0.0002 0.00054 0.001]
      Absorption [ 0.000057 0.00004 0.00001]
      MieScaleHeight 27

Michael

[MiR]

If someone has a deeper interest in the atmospheric conditions of Venus; here are some links about the blue haze (Fluorescent emission of carbon dioxide at Venus):

http://www.esa.int/SPECIALS/Venus_Expre ... R8F_0.html
http://www.esa.int/SPECIALS/Venus_Expre ... R8F_0.html
http://www.esa.int/SPECIALS/Venus_Expre ... R8F_0.html

Michael

[CAP-Team]

Thanks! This looks quite nice!

[MiR]

I have to explain something about the .ssc file...

Code: Select all

Modify "Venus" "Sol"
{
   Texture "venussurface.*"
   OverlayTexture "venus-atmosphere.*"
   # NormalMap "VenusNormal.*"
   HazeColor [ 0.5 0.35 0.2 ]
   HazeDensity 0.35
   Radius 6052

   Atmosphere {
      Height 75
      Lower [ 1 0.82 0.70 ]
      Upper [ 0.71 0.79 0.4 ]
      Sky [ 0.48 0.6 0.5 ]
      Sunset [ 0.9 0.75 0.47 ]

      CloudMap "venusclouds.*"
      CloudHeight 54
      CloudSpeed  90
      CloudShadowDepth 1.0

      Mie 0.0031
      MieAsymmetry -0.21
      Rayleigh [ 0.001 0.0025 0.006]
      Absorption [ 0.00057 0.0004 0.0001] #  [ 0.00057 0.0004 0.0]
      MieScaleHeight 31   # 27
   }

   CustomOrbit "vsop87-venus"

   # Overridden by CustomOrbit
   # EllipticalOrbit
        # {
   #   Period            0.6152
   #   SemiMajorAxis     0.7233
   #   Eccentricity      0.0068
   #   Inclination       3.3947
   #   AscendingNode     76.681
   #   LongOfPericenter 131.533
   #        MeanLongitude    181.979
   # }

   BodyFrame { EquatorJ2000 {} }
   # CustomRotation "iau-venus"

   # IAU Venus definition is simple uniform rotation
   UniformRotation
   {
       Period       5832.443616
       Inclination   157.16
       AscendingNode 182.76
       MeridianAngle  19.80
   }

   Albedo            0.77
}

"" "Sol"  # This section is necessary to show the oxygene haze in opengl 1.1, 1.2 & 1.4
{
   HazeColor [ 0.5 0.35 0.2 ]
   HazeDensity 0.35
   Radius 6052

   Atmosphere {
      Height 182
      Lower [ 1 0.92 0.70 ]
      Upper [ 0.001 0.1 0.54 ]
      # Sky [ 0.48 0.4 0.9 ]
      Sunset [ 0.1 0.2 0.54 ]

   }

   CustomOrbit "vsop87-venus"

   BodyFrame { EquatorJ2000 {} }
   # CustomRotation "iau-venus"

   # IAU Venus definition is simple uniform rotation
   UniformRotation
   {
       Period       5832.443616
       Inclination   157.16
       AscendingNode 182.76
       MeridianAngle  19.80
   }

   Albedo            0.77
}


#############################################################################
lower density of the blue ice crystal haze (You can change these values if you simply replace following Mie-parameters with the Mie-section above):
      Mie 0.0031
      MieAsymmetry -0.21
      Rayleigh [ 0.0002 0.00054 0.001]
      Absorption [ 0.000057 0.00004 0.00001]
      MieScaleHeight 27

There are two parts for Venus; the first one is the (modified) default, the second (extra-)section is necessary (because of the
different atmospheric height) for the bluish oxygene haze over the Venus clouds (showing with the Render Paths: opengl 1.1, 1.2, 1.4).

Here you can see the difference: above is with the additional section; bottom is without...

venus_atmosphere.jpg

...concerning the .ssc; well it's a bit unconventional... but currently the only way to realize this.

Maybe someone knows a more elegant solution...?

@ John Van Vliet: John, I've sent you a PM.

Michael

[Fenerit]

Hi Michael, maybe I've undertaken a mistake here, but is your Venus' map available through PM only? Whether yes, could please PM also to me?

[MiR]

Hi Massimo,

I still intend to send the files up to CML.

But I've made some mistakes and John refused the work;

I overlooked that there is no normal map within the default Celestia distribution.
Secondly, he thought that the additional section for the atmospheric declaration (see .ssc above) is not needed.

Therefore I've tried to explain this - here, with an image at shatters.net and also sent John a PM.

Just to make sure that he did not overlook my PM, I have written here yet an additional remark for him.

So, I'm somewhat sorry, that I cannot give you better news now...

Michael

[John Van Vliet]

--- edit ---

[MiR]

Thanks John,

You have taken responsibility for these add-ons. And I am sure you're doing a good job!

I apologize for my sloppiness (NormalMap) and now I've updated the "readme" and the .ssc file will have two explanatory entries (about the opengl renderings).

I'll upload the .zip again during the next few days.

Thanks again
Michael

[John Van Vliet]

--- edit ---

[MiR]

this "thing" comes within - and is an integral part of it - the official Celestia distribution. I've made it semi-transparent and blurred it only.

And, i already wrote it here, I try to simulate the atmospheric heat with that overlay texture. (If you were ever been in the desert, you can see; the sand is gray (more or less) but when the sun shines on it the desert itself looks yellow and orange.)

This topic started on 2. October 2010; the content of the .zip file is known to you since 3. January. And now - meanwhile I've already uploaded this file for the second time - you come along with your criticism... That annoys me.

Another complaint: Without asking me you insert a terrible picture of my add-on - your picture! This is not a good behaviour.

In view of the fact that the overlay texture makes changes mainly on your (sepia-tinted) VT and in respect of your work I'll publish my Venus clouds elsewhere and without the colour enhancements....

So, please delete my Venus Clouds addon!

Michael

[BobHegwood]

Another complaint: Without asking me you insert a terrible picture of my add-on - your picture! This is not a good behaviour.
Michael

Michael,
The terrible picture generated by your add-on was uploaded by myself as I updated the description of the new add-on on the Motherlode. This is part of what I do when new add-ons are ready to be located on the ML, and when they do not contain pictures of the add-on as it is displayed on the author's screen.

Blame ME for this...
I just tried to place a picture as it appears on MY screen because there was no other picture to use.
I am VERY sorry if this upset you. No harm was intended. You may feel free to upload your own picture too.

If you still wish to delete this add-on, you will have to contact Ulrich (a.k.a. Andirondack) as he is the only person who can do this.

Again, I am very sorry for the misunderstanding - and for the picture I used - but this was the best one I could generate on MY system.

Thanks, Brain-Dead Bob

[MiR]

John...

Now, it's up to me to say I'm sorry.
I assumed that you have uploaded the picture, because you've "worked" with the "Venus clouds" add-on.
Please excuse my hasty comment.
I'm really sorry...

Michael

[MiR]

Bob,

Thanks for the clarification.

...this was the best one I could generate on MY system.

...but I cannot understand (because the image looks really terrible ); you are using a much higher quality hardware than I do.
So, this result (as seen on your picture) I get when I put down the anti-aliasing value to 1 (within the "celestia.cfg" file; = disables anti-aliasing) and the "light-scattering" very high (There's almost no shadow).
I think that's not a good solution for brighter textures (Venus, Jupiter). But that's only my opinion.

Furthermore, there's no atmospheric haze to see around Venus...?

So, I would be glad if you could replace this image. I'll send you a new one.

And then, within the next few days, I'll make a new upload without the overlay texture. (have to write a new "readme", but currently I'm a bit stressed 'cause I have to work so much in my professional affairs...)

On the other hand; If more people see my Venus renderings this way I should remove it and solve the problem at first.

So, thanks again for your important explanation!

Michael

[John Van Vliet]

--- edit ---

[MiR]

Thanks John!

[BobHegwood]

bob's hardware , though quite good, IS badly configured .
or at least the screen shots are not good .
sorry bob but every one has not looked all that good .

Okay, sorry...
I'll play around with it some more, but I DO get spectacular screen shots of
some of the other objects in the system. See Jupiter below...

jupiter.jpg

Not good?
Thanks, Brain-Dead

[BobHegwood]

So, I would be glad if you could replace this image. I'll send you a new one.

Michael,

I have added your picture (still not a screen shot though) to the add-on.
I am required to have Ulrich delete the first image, so I have sent him an
e-mail asking that this picture be removed.

My apologies for the trouble. I really did not know that my images were
not accurate. Will take a good hard look at my settings again.

Many thanks for your understanding.

Take care, Brain-Dead Bob