[Bf-funboard] 3D compositing

[Ильдар Ахметгалеев]

Blender has 3D and compositing tools. But lacks of 3D compositing and 
even easy to use image transformation nodes.

I propose to make special node and object type for 3d viewport. Node 
takes image as input and shows this image in viewport with alpha 
transparency just like plane with image texture. Then node aplies object 
to camera matrix to input image and puts it to output. Also this node 
maight output Z distance from camera to image plane.

Such node do not requires a lot of computation like rendering image 
plane so it can be updadet live when object moves in viewport.

Also it solves problem with multilayer composition. Just now number of 
projected images limited by blender's layers (20 layers).

This is how it looks in Autodesk Smoke.
http://provideocoalition.com/images/uploads/3D_compositing_in_Smoke_-3D_VFX.png


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