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Author Topic: Efficient way to limit texture generation on LiDAR meshes  (Read 3728 times)

J.Drew

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Efficient way to limit texture generation on LiDAR meshes
« on: October 02, 2014, 07:10:01 PM »
Hello,

I am working on applying photogrammetric textures to larger meshes generated using terrestrial LiDAR.  Can anyone advise an efficient way to limit the portions of the mesh that are textured?  For example, an area behind a wall that was not photographed, yet textures for the occluding wall are projected onto the surface and confuse the project.  Perhaps there is a texture setting or tool that can limit textures to the "solved" area of a the photogrammetric model?

Thanks,

Jake

Wishgranter

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Re: Efficient way to limit texture generation on LiDAR meshes
« Reply #1 on: October 02, 2014, 07:32:44 PM »
Hi Jake, read PM, possibly can help....  ;)
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igor73

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Re: Efficient way to limit texture generation on LiDAR meshes
« Reply #2 on: October 02, 2014, 09:38:26 PM »
Have you done a photogrammetry model of the same object that was laser scanned and want to use that model for texture projection? 

You can UV map the model in another program like Zbrush, Maya, 3DS max , Blender etc.  You can then bring  the model back in to photoscan and project the texture.  Select keep UV when generating texture under the workflow menu.   Once you have the texture you can edit the texture in any of the above apps.  You can also edit the texture in Photoshop.  The UV map that photoscan generates is very hard to edit as it is broken up in thousands of little pieces and you canĀ“t make any sense of it. 

J.Drew

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Re: Efficient way to limit texture generation on LiDAR meshes
« Reply #3 on: October 02, 2014, 10:23:36 PM »
Yes, that is correct.  Thanks for the tip.

Jake

igor73

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Re: Efficient way to limit texture generation on LiDAR meshes
« Reply #4 on: October 07, 2014, 10:28:31 PM »
A few questions.  I have been planing to convert acoustic sonar data to mesh and then texture it.  So same kind of problems as you have. 

How do you convert the LIDAR point cloud to mesh?  Meshlab?  What file format is the LIDAR data? 

How do you align the LIDAR generated mesh in photoscan with the photogrammetry generated mesh?  Must be done manually right?  Or does point based align work at all?   




J.Drew

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Re: Efficient way to limit texture generation on LiDAR meshes
« Reply #5 on: October 09, 2014, 12:25:55 AM »
Igor,

My LiDAR clouds were meshed using Polyworks IMMerge.  There are many other solutions to accomplish this, Meshlab being one example.  The mesh was brought into Photoscan as an .obj, and aligned by manually identifying markers.  This has been generating good results, although I think the best way would probably be to use targets which can be marked  by both the scan processing software and Photoscan.

Good luck,

Jake