Wednesday, 16 November 2016

Looking into RTI (Reflectance Transformation Imaging)

Hi all, Today I saw a post on the 3d scanning users group on Facebook about a technique called Reflectance Transformation Imaging or RTI for short.

Also thanks to Jeffrey Ian Wilson for posting this.

The basic idea of it is to capture a series of images of a surface with different points of light, as to calculate the normals of the surface below. I won't go into any more detail but here is a list of really facinating websites which go into detail about all of the processes required to build an incredible set of images.

http://makezine.com/projects/shoot-super-detailed-macro-photographs-with-an-rti-camera-rig/

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

http://culturalheritageimaging.org/What_We_Offer/Downloads/index.html

This is a great post going into how to extract all of the maps for textures
Part One: http://practiceround.blogspot.co.nz/2015/10/faux-photometric-stereo-part-i-intro.html

Part Two: http://practiceround.blogspot.co.nz/2015/10/faux-photometric-stereo-part-ii.html


Some cool videos of the process

https://www.youtube.com/watch?v=Xlc8hN1hvm4&feature=share

https://www.youtube.com/watch?v=TjucGJiUkdY&feature=youtu.be

I hope to get something working myself over the next week, I'll probably do a build log of the process along with some example images.

the end goal is to get a substance designer graph with all of the inputs for the images and a bunch of write nodes for the different textures, as I have no programming or scripting experience to automate the process any other way.

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