Am 25.01.2019 um 12:13 schrieb gnagflow:
> Hi,
> although hidden behind the red plane, parts of the blue plane can be seen
> from the following location.

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.

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