Nuke 3D & 2D Compositing & Camera Projection for Supaquick Commercial

Nuke Camera Projection for Supaquick Commercial

by

www.andresteyn.com

here is the composited end result, but not the clients final version

here follows the breakdown ...

CLick on the image to make it bigger.
The Client already had a 3D camera with foreground robots ready, so I had to create a 3D matte painting as a set extension with the same camera parameters and movements.
This one 3D setup actually serves 3 different camera angles (6 shots).
To avoid lens distortion on images that had to be projected on geometry a lot of close ups had to be taken, hence more than 20 cameras projecting textures to make this scene work.
here is a link to see a walkthru.... 

Extensive knowledge of 3D space ( Nuke has a full 3D interface like any other 3D package) and photographic principles (i'm talking crop factors, focal lengths, focal depth, camera angle etc..) is needed to successfully work with Camera Projection. So plan carefully and play very nice with the 3D animator and modeller.
For instance if the 3D geometry created doesn't match the real world item exactly then an image of that same item is going to struggle to be projected unto the geometry representing that item.
So careful measurements need to be taken and logged or else you are going to sit the whole day trying to make projections work.

3D compositing and is a lot more complicated then 2D compositing !!


Problems:

clipping plane in 3D view obscures mid and far away geometry
neither fbx or chan files support focal length changes (animation)
softimage xsi to Nuke scale ratios and values are different as opposed to Modo with Nuke
avoid heavy fbx geometry
glowy edges planes with alpha channels but only in viewport
avoid wide angle lens images being projected at all costs.
obj tectures dont come thru.

Questions:
How can I bring a UV map and textures of an object thru to from a 3D package thru to Nuke's 3D workspace?
How can I bring focal length data thru
How do I UV wrap an item in Nuke?
How does 3D lights work in Nuke, how do I use it?
Lens distortion correction with grid maps.