ISSUE-2236 (preserve-3d): Resolve Painter's Model with respect to 3d rendering, z-index [Module: Transforms]

ISSUE-2236 (preserve-3d): Resolve Painter's Model with respect to 3d rendering, z-index [Module: Transforms]

http://www.w3.org/Graphics/SVG/WG/track/issues/2236

Raised by: Doug Schepers
On product: Module: Transforms

Per http://lists.w3.org/Archives/Public/public-svg-wg/2009JanMar/0148.html

[[
* There is an extremely important feature to 3d transforms that you  
haven't discussed. In CSS Transforms we call it transform-style:  
preserve-3d. Without this it is difficult to meet your requirements of  
nested 3d transformations. On this point, I suggest you write up your  
rendering model. As far as I can tell, this is the most important part  
of applying 3d to SVG. What happens to the painters' model? Do things  
closer in Z space draw in front, regardless of document order? What  
about elements in adjacent siblings with different Z? Do you flatten  
at group containers? Do objects intersect?
]]