shape from shade, so i do not take over Bjorn's Options

[JohnVV]

So that i do not take over his nice thread i figured i would start a new one
I am just figuring it out so bear with me
Rhea
This is a example - very early example
http://www.shatters.net/forum/viewtopic.php?f=5&t=15847

one that i am going to redo .
the program i am using "Cyclops" has a few bugs

Enceladus
this is a good example a bit better than the above



the close ups are a 8k level 3 VT with and without a texture over it
then a 4k level2 vt

unfortunately i still have to figure out a bug .I need to run a highpass on it ( the 32 bit isis dem )
Cyclops exports to a 3d *.ply this is easy to export to a isis cub
and i get this ( this happens when i combine 16 smaller images into one big one )
and this example is at 1/2 size


Just a bit of a bug !!!

[JohnVV]

five more and most likely the last until i find what is missing
DioneBump2.tar.bz2
http://www.zshare.net/download/75849188ad61eae2/

CODE

N1569826794.cub
N1569828025.cub
N1569828482.cub
N1569827906.cub
N1569828360.cub

same as above 16 bit unsigned 1024x1024 -with spiceinit

[Bjorn Jonsson]

Thanks - I'll take a look at these files soon.

I've been doing some experiments, including testing all of the SFS algorithms in Cyclops. Haines & Wilson 2 is by far the best one, at least for this type of scene. Some of the other algorithms result in something totally unrecognizable.

Rather unexpectedly, I usually get worse results using the correct light direction than I get by simply guessing it by looking at the image. This is probably because the DEM gets more 'tilted' in this case if the image footprint isn't near the center of the disk. Image N1507742440_2.img of Dione is a nice example, the correct direction to the sun is (0.303693, -0.205793, 0.930279) but I get a better DEM using (1.0, 0.5, 1.2) as in the screenshot earlier in the thread ( http://www.imagebam.com/image/6a107e78124092 ). If getting the correct direction to the sun for more images is of interest I can post it here.

BTW exactly how do you high pass filter the needle maps in Gimp/G'mic? I tried Photoshop's high pass filter with bad results - it somehow seems to 'destroy' the needle map. I get recognizable results but still bad (for one thing, too shallow craters relative to everything else regardless of the filter radius I use). High pass filtering the DEM I get when converting the obj files works well in some cases though if I didn't high pass filter the needle map. I took a very quick look at G'mic but didn't find anything that worked well.

The next step is to install ISIS and try SFS (pc2d) there now that I have a working Windows/Linux dual boot.