Recently i made a application for HTC Vive users to view 360 degree videos. To have a point of reference, lets assume that this video had a resolution of FullHD (1920x1080). See the picture of a 3D model below for illustration:
The field of view of a HTC Vive is 110° vertically and 100° horizontally.
It would be okay to simplify it to a round FoV of 100°.
My question would be: How can i determine the amount of video-information inside my FoV?
Here is what i know so far:
You can create a sphere on paper and calculate its surface area by using the formulas for spherical caps. -> https://en.wikipedia.org/wiki/Spherical_cap
Also there seems to be a function for the UV-Mapping that is done by Unity (because this is done in Unity). That formula can be found here: https://en.wikipedia.org/wiki/UV_mapping
Any suggestions are welcomed!
