> This is a simple precision issue: The camera does not "see" geometry
> that is too close to the camera's location (or, more precisely, the
> rays' origin). With the camera being very close to the red plane, a
> circular patch of it therefore disappears.
>
> Increase the scale of your entire scene and you should be fine.
I was ray-tracing scenes close to the surface of the earth (but not too
close to be aproximated by a flat plane where curvature no longer matters).
Is there another way to increase the precision?
Thx
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