Value for Pitch in case of upward looking camera

[weidmann]

Dear List

I try to create a model of a room including the ceiling. The camera locations and orientations are accurately surveyed using a total-station.

But I am failing to create a correctly orientated model of the ceiling.

According to the definition of pitch (see page 65 in https://www.agisoft.com/pdf/metashape-pro_1_5_en.pdf) I set the values for pitch close to 180 degrees.

But the model of the ceiling does not appear correctly orientated. Instead, it looks like a wall.

Question:
How do I set the value for pitch correctly? Yaw looks ok and roll is set to 0.0.

Looking forward to any hints.

Best regards,
Yvo