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Vesta
http://forum.celestialmatters.org/viewtopic.php?f=4&t=682
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Author:  John Van Vliet [ Wed, 23-07-14, 0:37 GMT ]
Post subject:  Vesta

it looks like a lot of us MISSED this

from UMSF
Bjorn Jonsson posted this on Jun 21

http://www.unmannedspaceflight.com/inde ... t&p=210479

the Vista DEM 64 ppd
http://dawndata.igpp.ucla.edu/tw.jsp?se ... R_HAMO_DTM
-180 to 180
Image Image

and map
http://dawndata.igpp.ucla.edu/tw.jsp?se ... ta/FC/Maps
0 to 360
Image

Author:  t00fri [ Wed, 23-07-14, 16:27 GMT ]
Post subject:  Re: Vesta

Wow,

that stuff is hot! It seems the resolution is also much better than ChrisL's gaskell add-on that is part of celestia.Sci by default.

While ChrisL used some clever tricks, the gaskell bodies (itokawa, eros, mimas, phobos, phoebe and vesta) --having high resolution-- do not admit surface textures (only a *.dxt5nm normalmap added onto non-spherical models))...

Fridger

Author:  John Van Vliet [ Wed, 23-07-14, 21:38 GMT ]
Post subject:  Re: Vesta

converted the 48 ppd dem cub to a 8 ppd raw( 2880x1441) imported into blender and remeshed
zero long and a close up
Image Image
North pole and a close up
Image Image
South pole and a close up
Image Image

Author:  abramson [ Thu, 24-07-14, 20:07 GMT ]
Post subject:  Re: Vesta

Amazing.

Author:  John Van Vliet [ Thu, 24-07-14, 21:07 GMT ]
Post subject:  Re: Vesta

the only issue with a mesh is the size
a 8ppd 16 bit raw image is 7.9 Meg
BUT a obj format mesh is 251 meg

and a 16 ppd image is 31 meg but the mesh is 1.2 GIG

so a 2 ppd mesh and a 16k normal map is going to be needed
the original 48 ppd DEM is 17281x 8641

Author:  t00fri [ Thu, 24-07-14, 21:15 GMT ]
Post subject:  Re: Vesta

For completeness:

Here is ChrisL's Gaskell Vesta (I referred to above) displayed in Cosmographia:
Attachment:
Vesta_Cosmo.jpg
Vesta_Cosmo.jpg [ 96.55 KiB | Viewed 13331 times ]


..and here are games with texture-based Vesta in celestia.Sci from several years ago that I have played at the time:

[Click on images by all means!]
Attachment:
Vesta.jpg
Vesta.jpg [ 149.8 KiB | Viewed 13331 times ]

Attachment:
Vesta2.jpg
Vesta2.jpg [ 256.83 KiB | Viewed 13331 times ]


Fridger

Author:  John Van Vliet [ Sat, 26-07-14, 0:57 GMT ]
Post subject:  Re: Vesta

just a test
a 17 meg mesh and a 7 meg 4k normalmap
( the normal i have to remove the vertical strips i somehow have )
Image Image Image
with normal
Image Image Image

still room to shrink the mesh and make sure that there are NO vertical strips :wall: :wall:

Author:  John Van Vliet [ Sat, 26-07-14, 5:03 GMT ]
Post subject:  Re: Vesta

a 1 meg mesh and a 7.4 meg 4k normalmap
( without the odd strips i added in making a hipass

Image Image Image Image

Author:  John Van Vliet [ Sat, 26-07-14, 18:16 GMT ]
Post subject:  Re: Vesta

the texture lines up nicely
Image Image Image Image

Author:  John Van Vliet [ Thu, 14-08-14, 3:40 GMT ]
Post subject:  Re: Vesta

check the spice section for the files
a previews of the Medres mesh and 4k textures
Image Image

Author:  t00fri [ Thu, 14-08-14, 6:32 GMT ]
Post subject:  Re: Vesta

Very nice, indeed!

Fridger

Author:  symaski62 [ Sat, 27-06-15, 20:47 GMT ]
Post subject:  Re: Vesta

new image 1024 pixel

Image


http://astrogeology.usgs.gov/search/det ... _74ppd/cub

attention !

Lines (pixels)13352
Samples (pixels)26704

:D

Author:  John Van Vliet [ Sat, 27-06-15, 21:14 GMT ]
Post subject:  Re: Vesta

the map on
http://astrogeology.usgs.gov/search/det ... _74ppd/cub
is the same one as in the first post
http://dawndata.igpp.ucla.edu/download. ... global.cub
this cub's label
Code:
Object = IsisCube
  Object = Core
    StartByte   = 65537
    Format      = Tile
    TileSamples = 1161
    TileLines   = 1027

    Group = Dimensions
      Samples = 26703
      Lines   = 13351
      Bands   = 1
    End_Group

    Group = Pixels
      Type       = UnsignedByte
      ByteOrder  = Lsb
      Base       = 0.0
      Multiplier = 1.0
    End_Group
  End_Object

  Group = Archive
    ProducerInstitutionName = "German Aerospace Center (DLR)"
    TargetName              = VESTA
  End_Group

  Group = Mapping
    ProjectionName     = SimpleCylindrical
    CenterLongitude    = 180.0
    TargetName         = Vesta
    EquatorialRadius   = 255000.0 <meters>
    PolarRadius        = 255000.0 <meters>
    LatitudeType       = Planetocentric
    LongitudeDirection = PositiveEast
    LongitudeDomain    = 360
    MinimumLatitude    = -90.0
    MaximumLatitude    = 90.0
    MinimumLongitude   = 0.0
    MaximumLongitude   = 360.0
    UpperLeftCornerX   = -801030.0 <meters>
    UpperLeftCornerY   = 400470.0 <meters>
    PixelResolution    = 60.0 <meters/pixel>
    Scale              = 74.176493209759 <pixels/degree>
  End_Group
End_Object

Object = Label
  Bytes = 65536
End_Object

Object = History
  Name      = IsisCube
  StartByte = 356577290
  Bytes     = 569
End_Object

Object = OriginalLabel
  Name      = IsisCube
  StartByte = 356577859
  Bytes     = 1657
End_Object
End


there is also a png and jp2 image
http://dawndata.igpp.ucla.edu/tw.jsp?se ... mosaic_DLR



for the Add on i ran a highpass after cleaning up some of the shadows
viewtopic.php?f=18&t=629#p12565
Image

Author:  Goofy [ Wed, 01-07-15, 20:20 GMT ]
Post subject:  Re: Vesta

Hi.
Probably this is a silly question, but I found here
https://solarsystem.nasa.gov/multimedia/display.cfm?Category=Planets&IM_ID=17265
a very interesting Vesta Topography Map, almost 12K large (exactly 11521 x 5761 pixel), where heights are color coded from 13.96 miles (22.47 kilometers) below the surface in purple to 12.11 miles (19.48 kilometers) above the surface in white.
I know absolutely nothing about 3D planet modelling, but this could not be used for such a purpose?
Height data have been obtained from 17000 images taken with varying sun and viewing angles.
I think that perhaps you 3D gurus could use it, don't you?
Just to play, I worked a little on it, removing the defect (often present in NASA images, dunno why) of black columns at the junction, and reduced its dimensions to publish it here.
Very curious to know if I'm wrong or not.
Bye

Goofy :)

Attachments:
File comment: Very reduced in size and quality to achieve the 500K limitation.
Vesta32_COL-SMALL.jpg
Vesta32_COL-SMALL.jpg [ 501.29 KiB | Viewed 12329 times ]

Author:  John Van Vliet [ Wed, 01-07-15, 20:59 GMT ]
Post subject:  Re: Vesta

hi Goofy

i think what i will do is post the workflow i use as a rough tutorial
i am currently ( as in as i type this ) working on near earth asteroid "101955bennu"
--Wikipedia page --
https://en.wikipedia.org/wiki/101955_Bennu

the scientific data
--EAR_A_I0037_5_BENNUSHAPE_V1_0 --
http://sbn.psi.edu/pds/resource/bennushape.html
-- this will be in a new post

but
Quote:
a very interesting Vesta Topography Map, almost 12K large (exactly 11521 x 5761 pixel),

that size 11521 x 5761 is not a multiple of "2" BUT a multiple 360 +1
( the +1 px is do to the CENTER of the px is were latitude and longitude is STARTED )
that size is a 32 ppd image ( 32 pixels per degree )

Quote:
I know absolutely nothing about 3D planet modelling, but this could not be used for such a purpose?

no, not really .This image is a false color that is superimposed on a shaded relief map

Quote:
I think that perhaps you 3D gurus could use it, don't you?

not really , but it is cool to look at

for 3d work one NEEDS height data - real or synthetic
that would be the DEM in the first post
Image
DEM = Digital Elevation Model
these pixel values are in Meters or Kilometers of the RADIUS of the body at that point

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