Pretty neat idea to automatically determine angle between camera and light
source in images, based on the position of the center of the highlight on the
surface of a refelctive sphere.


Highlight-based PTMs:
http://www.hpl.hp.com/research/ptm/HighlightBasedPtms/index.html

"Move the handheld flash to various positions, keeping it a fixed distance to
the object being photographed. If these images are placed in a directory, and
that directory specified in the PTMbuilder application, highlights appearing in
the ball will be automatically found for each image. The software will then
compute light directions from these highlights and construct a PTM from the
images automatically.  "

https://rembrandt3d2014.weblog.tudelft.nl/files/2014/10/RTI.jpg

This was a very interesting description about how 3D surface geometry can be
encoded from specular highlight, and therefore surface normal information:

http://culturalheritageimaging.org/Technologies/RTI/

http://culturalheritageimaging.org/What_We_Do/Publications/vast2006/VAST2006_final.pdf

Sure to spark some inventive ideas   :)

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