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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Apr 27 2010, 04:22 AM
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Member Group: Members Posts: 890 Joined: 18-November 08 Member No.: 4489 |
only 3 show so a link to the photo album http://www.imagebam.com/gallery/4b4122b9b7...991f649094aac3/ the first 1) is in blender with z *3 exaggerated x3 of the highpassed needle map 2) same but diff angle 3) same 3d mesh but a "front view" 4) a "top view" of the same -- the next 3 are the NOT high passed needle map -- 5) front view ( the mesh is on an angle and would need "hand" "flattening" for every image - none would match up for a mosaic ) and some meshes ( not shown ) have a VERY,and i do mean a VERY big curve in them do to the lighting on the moon - a highpass is also needed to remove that 6)top view 7) and angled view at this point i am not too worried about the scientific accuracy as to being able to get something that dose look nice THEN i will see about getting it accurate |
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Apr 29 2010, 09:26 PM
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IMG to PNG GOD Group: Moderator Posts: 2254 Joined: 19-February 04 From: Near fire and ice Member No.: 38 |
I have now tested Cyclops a bit. The first test run resulted in a crash (no surprise there) but I'm now getting something that makes at least some sense. The next step is to write a small utility that uses the viewing geometry information in the IMG/index.tab files to output accurate values to use for "To Light" (the values I have used do not make a lot of sense).
This may be a stupid question but how did you export to a .ply file? The only output I was able to get was a BMP file. Actually I'm getting the impression that the Windows version I'm using has somewhat less features than the Linux version, this is a screenshot: A bit fewer buttons etc. than in the Linux Cyclops screenshot earlier in the thread. 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 !!! Actually I'm not sure this is a bug - the surface is 'curved' if the source image(s) is not a very hi-res res. It might be possible to 'convert' the output to altitude relative to the target body's radius instead of the 'depth' that Cyclops outputs if I understand everything correctly (or have you already done this?). However, I suspect this wouldn't work very well because low frequency features are usually inaccurate in SFS. So I suspect I'll end up doing the same thing you did (high pass filter) and/or combining the SFS output with a DEM derived from stereo pairs. Another contributing factor might be inaccurate values for "To Light" - that's something I'll be testing once I have accurate values to use for "To Light". I'm curious to see how sensitive the SFS algorithms are to errors in the light source direction. |
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