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Topics - Christian

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1
Python Scripting / Scale a model / Accuracy / multiple sizes
« on: August 16, 2019, 12:10:38 PM »
Hi!
My task is to export models in different scales / sizes as some programs, my clients are using, are not configurable with regard to the import units. A model that has 30cm in Agisoft is very small (factor 1000) compared to models created with other software. I know that OBJ and other fileformats do not contain any information regarding the units (Meters, cm, mm, inch....) and that the interpretation has to be done within the 3D software that is importing.

To help my client, importing 3D models from different programs in same sizes/scales, I want to export the created model in different "scales". I use markers and scalebars to size the model automatically and it works perfect. See picture 30cm.jpg.

My idea was to change the definied distance of the scalebar from 0.3 Meters to 300 Meters and have the same model - just larger by factor 1000. Basically that works - but it is not scaled by factor 1000 - it has deviations as visible in picture 300m.jpg. A former distance from approx. 19 cm becomes 18.6 cm. I expect that it comes from accuracy and that the error will multiply, when changing scales.

Is there any other way to scale a model *exacty* by factor 1000? And no - it is not possible to do this during the import into the other software - it does not contain any feature / configuration to set the units.

Thank you - Christian

2
Face and Body Scanning / Full Body Scanner / aligning of photos
« on: December 10, 2013, 11:23:58 PM »
I am currently setting up a full body scanner using inexpensive 5MP camera modules. I am not looking for a perfect 1:1 scale usage of the models - models will be later printed out between 2 cm (!) and 20cm - I do not need all details - even though I love the work of INFINITE/LEE. Thank you for all inspirations!

This setup and quality works fine and the results are promising. Today we are setting up 40 cameras for 180 degree - I expect that we end up with 100 cameras (total material cost of that full body scanner will be less than 10.000€). Plan is to roll out some hundrets of that 3D photo booths around the world  :)

My question / problem is:

If I use the first setup up pictures (27 pcs) at once (load all into PS) and then apply a background mask, PS is not able to align the photos (Attchment 1). The cameras are completly wrong orientated. If use chunks (also with applied background mask) and put inside the first 8 pictures (head) - all pictures are alligned perfectly. If I put another 4 to that "working" chunk, again fine - photos are alingned (attachment 2). This works perfectly until some photos are not alignable (in our case the feet where the cameras are not set up perfectly at this time...) (attachment 3).

How can we solve that problem that we first have to detect the "distroying" pictures and than can build a model? I would love to put all photos inside and get the non alignable photos sorted out - but why are the photos that can obviously be aligned perfectly also disorientiated??

Any comment welcome...
Christian

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