func (c *cam) update(camera vu.Camera) {
fraction := 0.25
pitch := camera.Pitch()
if !lin.Aeq(pitch, c.pitch) {
pitch = (c.pitch-pitch)*fraction + pitch
camera.SetPitch(pitch)
}
yaw := camera.Yaw()
if !lin.Aeq(yaw, c.yaw) {
yaw = (c.yaw-yaw)*fraction + yaw
camera.SetYaw(yaw)
}
}
// reset puts the target pitch and yaw back to zero.
func (c *cam) reset(camera vu.Camera) {
c.pitch, c.yaw = 0, 0
camera.SetPitch(0)
camera.SetYaw(0)
}