koobas.hobune.stream
Incorrect Unity Camera Horizontal/Vertical FOV conversions
Using Version 2020.1.4f1, Camera.HorizontalToVerticalFieldOfView and Camera.VerticalToHorizontalFieldOfView seem to be returning incorrect values, and I am seeing matching incorrect values when changing the camera 'FOV Axis' option in the editor between Horizontal and Vertical. Attempting to accurately set FOV through scripts is broken by this.
Is there something I'm missing or a way to correct for this behaviour?
In the watch frame attached, at a 16:9 aspect ratio a Horizontal FOV of 50 should convert to a Vertical FOV of 28.125, however the Camera helper function doesn't match the result.
Simply scaling the FOV angle by the aspect ratio isn't correct; you need to use tan() to find the ratio of the screen lengths, scale that, then convert back into an angle;
float VerticalToHorizontalFOV (float a_VerticalFOV, float a_Aspect)
{
return Mathf.Atan (Mathf.Tan (a_VerticalFOV * 0.5f) * a_Aspect) * 2f;
}
