Photogrammetry With Moving Light Source

[jkao89]

Hi everyone,

I've been using Photoscan for the last 3 months and it has given me some very impressive results 

I am working on a project which may require a moving light source. I've done photogrammetry all in the past using fixed, static light sources and I understand why it produces the best results.

What I am wondering is, if a moving light source is required, what steps can be taken in order to ensure good output.

Does anyone have ideas?

Thanks

[JMR]

If moving lights is a must, I guess there must be a reason... ok, but, can you switch the moving light on/off and have a global lighting available at the same time? If that was the case, I you could take each photo in the two ligting conditions. Process the steady lit photos as usual and at the final stage just before texture and ortho creation, change the path for all photos to the folder containing the changing lights photos. This trick requires renaming files accordingly, but it probably will give you a sort of what you wanted (in fact you will get ugly transitions across mosaic regions, but this is an unavoidable direct consecuence of your desire/need)

Best
GEOBIT

[James]

https://skfb.ly/MMTV

This is one I did where the light was an sb600 mounted on my camera with roundflash diffuser. Hand held about 80 shots all around, so light source was in a different position for every shot, relative to the object at least.

Didn't do anything different in processing really! Not sure if that's helpful or not...

This result is uploaded straight out of photoscan, I just added the glossy shader in sketchfab. Switch to shadeless to see the photoscan texture.

Attached one of the source photos.

[awake]

I've never worked with moving light sources but moving the camera relativ to the light source (e.g. the sun) should give you similar results I think. If you can influence it, I'd go for diffuse light and go ahead with the workflow. It also depends on the use case - what exactly are you trying to do?