"bancquart.sebastien" <ban### [at] wanadoofr> wrote in message 
news:42b19ec3@news.povray.org...
> does the same on my PC, unless I remove the "orthographic" or if I move 
> the camera to at least <0,0,-0.9>

Right. It was known that placing an orthographic camera too close can cause 
vanishing or incorrectly rendered objects.

I checked this in the current beta of v3.7 and found it is okay, with an 
exception. That being, the camera at -0.1*z is at the surfaces of the two 
crossing cylinders and it renders with a missing strip along the centers of 
them. If moving it inward to -0.09*z or outward to -0.11 it renders 
correctly, even with the added diagonal pigmentless cylinder.

Bob Hughes

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