void PerspectiveImpl::ComputeDefaultAngle (float width)
{
float rview_fov = (float)GetDefaultFOV () * 0.5f;
float disp_width = (float)width * 0.5f;
float inv_disp_radius = csQisqrt (
rview_fov * rview_fov + disp_width * disp_width);
default_fov_angle = 2.0f * (float)acos (disp_width * inv_disp_radius)
* (360.0f / TWO_PI);
}
float Misc::CalcFOV(const size_t iResX, const size_t iResY)
{
constexpr float fDeg2Rad = static_cast<float>(M_PI) / 180.0f;
constexpr float fDefaultAspect = 4.0f / 3.0f;
const float fAspect = static_cast<float>(iResX) / iResY;
const float fFov = atanf(tanf(0.5f*GetDefaultFOV()*fDeg2Rad)*(fAspect / fDefaultAspect)) / fDeg2Rad*2.0f;
return fFov;
}
float CBasePlayer::GetFOVDistanceAdjustFactor()
{
float defaultFOV = (float)GetDefaultFOV();
float localFOV = (float)GetFOV();
if ( localFOV == defaultFOV || defaultFOV < 0.001f )
{
return 1.0f;
}
// If FOV is lower, then we're "zoomed" in and this will give a factor < 1 so apparent LOD distances can be
// shorted accordingly
return localFOV / defaultFOV;
}
