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Topics - FLuca

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General / Issue when scaling model with camera relative postions
« on: December 04, 2017, 01:46:11 PM »
Hello Guys,

I am confused with poor result in scaling 3D models.

Instead of taking reference measurements on the model, which is not very precise on human body, or marker on the ground, I wanted to use the camera relative distance.
On my rig this distance is fixed and larger than any feature that can be reconstructed so I expected to have more precise scaling than using object feature.

So I scanned a wood chunk 8x8cm large with a camera distance of around 2 meters from each other.
The result is very disapointing. The resulting model is about 8.5% larger than reality.

Even with unprecised measurement of the camera positions, I expected only few %

My questions are:

What does the camera position represent in photoscan: focal point, sensor center, ... ?

Did any of you used this method with success ?

Any tip welcome

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