shape from shade, so i do not take over Bjorn's |
shape from shade, so i do not take over Bjorn's |
Apr 7 2010, 04:03 AM
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#1
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Member Group: Members Posts: 890 Joined: 18-November 08 Member No.: 4489 |
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 !!! |
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May 12 2021, 06:47 PM
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#2
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Member Group: Members Posts: 890 Joined: 18-November 08 Member No.: 4489 |
QUOTE why does the 2 sides of the crater rim SFS dem look higher then everything else this is how the program works the areas that are tangent do not pick up the height data very well this causes the " valley" effect in the direction of the lighting this is one of the drawbacks of using SFS now using gmic to remove most of the low frequency data this is somewhat improved ,but not eliminated there is still no really GREAT solution to this issue SFS is still a problem to be solved |
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May 21 2021, 03:07 AM
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#3
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Senior Member Group: Members Posts: 2530 Joined: 20-April 05 Member No.: 321 |
there is still no really GREAT solution to this issue SFS is still a problem to be solved Indeed. And for a surface with unknown reflectance properties (e.g., an outer solar system body with very few images) not to mention albedo variation that is not due to illumination conditions, it's in principle an unsolvable problem. A 2006 work, for reference: https://ieeexplore.ieee.org/document/1640974 |
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Jun 10 2021, 11:37 AM
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#4
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Member Group: Members Posts: 127 Joined: 15-April 21 Member No.: 9009 |
a friend of mine processed this fantastic dem from one of the juno ganymede images
it captured all the little cracks and stuff very well here is a map verson i made from that dem (fixed inaccurate elevation, and issues in some craters) |
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