First, considering the 2/1 equirectangular projection with Tissot’s indicatrix, we can see that the more the apparent vertical angle, the more the deformation :
To my point of view 60° vertical angle seems to be the ultimate low deformation limit, so I need to calculate the minimal and maximal distances to my subject, depending on its size.
The secret, in fact, since all the panos I’ve seen so far presents deformed due to the camera’s height is to take the middle of your subject as the horizontal focus point.
We can then use a common formula, also known as the « apparent size formula » , often used in astronomy , link here :
Wikipedia: Angular diameter
D = ((d/2)/tanA/2))
« D » as the distance to the subject, « d » the subject’s size.
In other terms:
Now considering multiple subjects with different sizes I can master the composition if I want to make a stylized flat equirectangular pano.
Hence I think you can now apply portrait art to 360° panophotography.
But remember you’ll face a lot of problemes with lights, focus, focla length, subject’s speed etc … to make something very stylized.
Stay tuned for more results .
#360 #equirectangular #portrait art photography #compositing