private void UpdateFieldOfView(FieldOfView leftEyeFov, FieldOfView rightEyeFov)
{
CardboardDeviceParams cdp = mHmd.getCardboard();
ScreenParams screen = mHmd.getScreen();
Distortion distortion = cdp.getDistortion();
float idealFovAngle = (float)Math.ToDegrees(Math.Atan2(cdp.getLensDiameter() / 2.0F, cdp.getEyeToLensDistance()));
float eyeToScreenDist = cdp.getEyeToLensDistance() + cdp.getScreenToLensDistance();
float outerDist = (screen.getWidthMeters() - cdp.getInterpupillaryDistance()) / 2.0F;
float innerDist = cdp.getInterpupillaryDistance() / 2.0F;
float bottomDist = cdp.getVerticalDistanceToLensCenter() - screen.getBorderSizeMeters();
float topDist = screen.getHeightMeters() + screen.getBorderSizeMeters() - cdp.getVerticalDistanceToLensCenter();
float outerAngle = (float)Math.ToDegrees(Math.Atan2(distortion.distort(outerDist), eyeToScreenDist));
float innerAngle = (float)Math.ToDegrees(Math.Atan2(distortion.distort(innerDist), eyeToScreenDist));
float bottomAngle = (float)Math.ToDegrees(Math.Atan2(distortion.distort(bottomDist), eyeToScreenDist));
float topAngle = (float)Math.ToDegrees(Math.Atan2(distortion.distort(topDist), eyeToScreenDist));
leftEyeFov.setLeft(Math.Min(outerAngle, idealFovAngle));
leftEyeFov.setRight(Math.Min(innerAngle, idealFovAngle));
leftEyeFov.setBottom(Math.Min(bottomAngle, idealFovAngle));
leftEyeFov.setTop(Math.Min(topAngle, idealFovAngle));
rightEyeFov.setLeft(Math.Min(innerAngle, idealFovAngle));
rightEyeFov.setRight(Math.Min(outerAngle, idealFovAngle));
rightEyeFov.setBottom(Math.Min(bottomAngle, idealFovAngle));
rightEyeFov.setTop(Math.Min(topAngle, idealFovAngle));
}
private EyeViewport initViewportForEye(EyeParams eye, float xOffsetM)
{
ScreenParams screen = mHmd.getScreen();
CardboardDeviceParams cdp = mHmd.getCardboard();
float eyeToScreenDistanceM = cdp.getEyeToLensDistance() + cdp.getScreenToLensDistance();
float leftM = (float)Math.Tan(Math.ToRadians(eye.getFov().getLeft())) * eyeToScreenDistanceM;
float rightM = (float)Math.Tan(Math.ToRadians(eye.getFov().getRight())) * eyeToScreenDistanceM;
float bottomM = (float)Math.Tan(Math.ToRadians(eye.getFov().getBottom())) * eyeToScreenDistanceM;
float topM = (float)Math.Tan(Math.ToRadians(eye.getFov().getTop())) * eyeToScreenDistanceM;
EyeViewport vp = new EyeViewport();
vp.x = xOffsetM;
vp.y = 0.0F;
vp.width = (leftM + rightM);
vp.height = (bottomM + topM);
vp.eyeX = (leftM + xOffsetM);
vp.eyeY = bottomM;
float xPxPerM = screen.getWidth() / screen.getWidthMeters();
float yPxPerM = screen.getHeight() / screen.getHeightMeters();
eye.getViewport().x = Math.Round(vp.x * xPxPerM);
eye.getViewport().y = Math.Round(vp.y * xPxPerM);
eye.getViewport().width = Math.Round(vp.width * xPxPerM);
eye.getViewport().height = Math.Round(vp.height * xPxPerM);
return(vp);
}
