I am trying to understand the mesh camera and picking apart the demo 
scenes but I'm just not getting something.

I thought the mesh involved had to have on triangle per pixel, and 
that's easy enough. The normal vector of the triangle determines the 
direction of the ray for that pixel. Does the position of the mesh also 
determine the location of the ray?

A second question: is the first triangle in the mesh the upper left 
corner of the image or bottom left corner?

A third question: does the ray start at the first vector in each triangle?

I set up a simple scene with a vertical cylinder, but through the mesh 
camera it shows up horizontally. So I'm wondering if the second triangle 
in the mesh has to follow the column or the row.

Any help from those of you who are way smarter than me?

Thanks

Uncle Josh

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