It *is* perspective. “In geometry, a solid angle (symbol: Ω) is a measure of the amount of the field of view from some particular point that a given object covers. That is, it is a measure of how large the object appears to an observer looking from that point.” Steradian https://en.wikipedia.org/wiki/Solid_angle

It *is* perspective.
 
“In geometry, a solid angle (symbol: Ω) is a measure of the amount of the field of view from some particular point that a given object covers. That is, it is a measure of how large the object appears to an observer looking from that point.”
 
Steradian
https://en.wikipedia.org/wiki/Solid_angle

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