Ground texture issue

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wozniak88

• October 17, 2017 14:37

Hello guys, I`m doing photogrammetry texture. Photos contain some grass lying on the ground, however after computing I get "wobbly" and stretched results for grass: 

 

This how it looks in RC on high settings:

This is how texture looks, when i bake in Xnormal: 

 

I did not change any settings, I think something must be changed in this type of reconstruction? 

 

Thank you for any help here!

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  ivan

  • October 17, 2017 15:38

  The result you are getting is due to poor alignment,  likely due to not enough photos or bad quality photos or a mixture.

  
  Can you share with us how many images you have, and maybe a example of 1 photo - full res.

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  wozniak88

  • October 17, 2017 16:37

  Ivan, thank you for your help. 

   

  I have 38 photos in my project, here is the hi-res:

   

  https://ibb.co/dvH60m 

   

  I must admit, that I did not work too much on alignment, need to find more information about how to do that properly. 

   

   

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  Götz Echtenacher

  • October 18, 2017 07:06
  • Edited

  Hi wozniak,

  I'm afraid that even with a perfect alignment you will not get the result you are aiming for.

  RC is superior with fine structures, but I think that the pine needles ;-) in your image are still too thin for RC to be able to model them properly. The blurriness and wobbles are in that case inevitable because the texture is being projected from different directions on a surface that does not properly reflect the real geometry...

  In my opinion you can only improve this by getting closer with your camera, so that the needles will be at the very least 30 pixels wide (better 50), as a rough guideline.

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  ivan

  • October 18, 2017 08:58

  Gotz is correct.

   

  You need to get closer,  your image from a far looks nice and sharp, however when zooming in losslessly, you can see the true data the application has to work with.

  I see a few areas which are not helping.

  1) It appears a sharpening filter has been applied to the image, either when the image was taken or during post.
  Do not do this,  whilst sharpening filters offer pseudo sharpness to our eyes, it does alter the pixels and does not help with the calculations the software does.   You can see a black halo border around each object.  If it was the camera try shooting in raw, or turning off any "picture" or sharpness settings.

  2) As Gotz explained. - There is insufficient detail on the needles.   -  Getting in a lot closer so there is some chance of identifiable points is likely to help.  And don't be afraid to take a lot more images.    Exclude any ones that are not naturally sharp.
  Start with a smaller area with more closer images.   Get that working nicely then work on a wider space after you have the procedure masterd.
  
  

  If you reshoot with both the above - you shouldn't need to do anything special with tweaking alignment - the software does all the hard work.   
  
  If you do manage to get another go, - Keep us updated with the results. :)

   

  

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  wozniak88

  • October 20, 2017 09:51

  Thank you guys, I will re-do everything from scratch ^_^

   

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