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getnamo/HMD Projection Matrix to FOV Calculations

Last active April 9, 2018 18:50
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HMD Projection Matrix to FOV Calculations
/*UE4 Reported Values from Projection Matrices
DK2
[0.92991 0 0 0]
[0 0.75097 0 0]
[??? ??? 0 1]
[0 0 10 0]
CV1
[1.190342 0 0 0]
[0 0.999788 0 0]
[-0.148592 0.110690 0 1]
[0 0 10 0]
Vive
[0.756892 0 0 0]
[0 0.681268 0 0]
[-0.056316 0.003274 0 1]
[0 0 10 0]
*/
/*
Projection Matrix formulas
[s 0 0 0 ]
[0 s 0 0 ]
[0 0 -f/(f-n) -1]
[0 0 -fn/(f-n) 0 ]
where s=1/(tan((fov/2)*pi/180))
*/
/*
google s calc formula
1/(tan((x/2)*pi/180))
google fov calc formula
arctan(1/s)*360/pi*/
Results:
hmd
hs hfov
vs vfov
dk2
0.92991 94.159880
0.75097 106.189099
vive
0.756892 105.756425
0.681268 111.469296
cv1
1.190342 80.066880
0.9997888 90.012102
@sudarshanReddykurri
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Hey does these values still hold for Vive

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