Camera lens distortion

[jrgby]

Please could someone explain how the custom lens distortion works?

This is the tooltip:

Distortion based on custom texmap, using red component to map X values and green component to map Y values. Blue component of the texmap is ignored.

Thanks!

[maru]

Sorry for the lack of response here. I _think_ that it works similar to a normal map, which displaces the rendered image based on the map's colors. We'll get back to you with some simple examples ASAP.

[jrgby]

Thanks Maru.

[Vlad_the_rant]

I've managed to find this explanation of lens distortion maps:

https://knowledge.autodesk.com/support/3ds-max/learn-explore/caas/CloudHelp/cloudhelp/2017/ENU/3DSMax/files/GUID-71FF38CD-07E4-419B-A8AF-69CE101182A0-htm.html

And this is a tutorial on how to create a distortion map in Nuke and how to use it:

http://vfx-rants.blogspot.com/2013/07/using-stmap-based-deformations-for-lens.html

Hope this helps.