void Update()
{
DisplayParameters newDisplay = DisplayParameters.Collect();
UpdateView(HmdParameters.Instance, newDisplay);
_hmdParamsDirty = false;
_display = newDisplay;
}
public static Fov GetFovDistancesLeft(DisplayParameters display, HmdParameters hmd)
{
float outerDist = 0.5f * (display.Size.x - hmd.InterlensDistance);
float innerDist = 0.5f * hmd.InterlensDistance;
float bottomDist = hmd.EyeOffsetY;
float topDist = display.Size.y - bottomDist;
return(new Fov(outerDist, innerDist, bottomDist, topDist));
}
void OnEnable()
{
_display = null;
_camWorldLeft = GetComponentsInChildren <Camera>().First(cam => cam.stereoTargetEye == StereoTargetEyeMask.Left);
_camWorldRight = GetComponentsInChildren <Camera>().First(cam => cam.stereoTargetEye == StereoTargetEyeMask.Right);
_camWorldLeft.transform.localRotation = Quaternion.identity;
_camWorldRight.transform.localRotation = Quaternion.identity;
_undistortionTex = new Texture2D(texWidth, 1, TextureFormat.RGB24, false, true);
_undistortionTex.filterMode = FilterMode.Bilinear;
_undistortionTex.wrapMode = TextureWrapMode.Clamp;
HmdParameters.Instance.ParamsChanged.AddListener(OnHmdParamsChanged);
}
void UpdateView(HmdParameters hmd, DisplayParameters display)
{
Distortion distortion = new Distortion(hmd.DistortionK1, hmd.DistortionK2);
float zNear = _camWorldLeft.nearClipPlane;
float zFar = _camWorldLeft.farClipPlane;
Fov displayDistancesLeft = Calculator.GetFovDistancesLeft(display, hmd);
// То, как должен видеть левый глаз свой кусок экрана. Без линзы. C учётом только размеров дисплея
Fov fovDisplayTanAngles = displayDistancesLeft / hmd.ScreenToLensDist;
// FoV шлема
Fov hmdMaxFovTanAngles = Fov.AnglesToTanAngles(hmd.MaxFovAngles);
// То, как должен видеть левый глаз свой кусок экрана. Без линзы. C учётом размеров дисплея и FoV шлема
Fov fovEyeTanAglesLeft = Fov.Min(fovDisplayTanAngles, hmdMaxFovTanAngles);
// То, как должен видеть левый глаз. Мнимое изображение (после увеличения идеальной линзой без искажений). С широким углом. Именно так надо снять сцену
Fov fovWorldTanAnglesLeft = Calculator.DistortTanAngles(fovEyeTanAglesLeft, distortion);
Matrix4x4 projWorldLeft;
Matrix4x4 projWorldRight;
Calculator.ComposeProjectionMatricesFromFovTanAngles(fovWorldTanAnglesLeft, zNear, zFar, out projWorldLeft, out projWorldRight);
Matrix4x4 projEyeLeft;
Matrix4x4 projEyeRight;
Calculator.ComposeProjectionMatricesFromFovTanAngles(fovDisplayTanAngles, zNear, zFar, out projEyeLeft, out projEyeRight);
_camWorldLeft.transform.localPosition = 0.5f * Vector3.left * hmd.InterlensDistance;
_camWorldRight.transform.localPosition = 0.5f * Vector3.right * hmd.InterlensDistance;
_camWorldLeft.projectionMatrix = projWorldLeft;
_camWorldRight.projectionMatrix = projWorldRight;
float maxWorldFovTanAngle = GetMaxDiagonalValue(fovWorldTanAnglesLeft);
UpdateUndistortionTex(distortion, maxWorldFovTanAngle);
EyeMaterial.SetFloat("_MaxWorldFovTanAngle", maxWorldFovTanAngle);
EyeMaterial.SetTexture("_UndistortionTex", _undistortionTex);
EyeMaterial.SetVector("_ProjectionWorldLeft", ComposeProjectionVector(projWorldLeft));
EyeMaterial.SetVector("_ProjectionEyeLeft", ComposeProjectionVector(projEyeLeft));
}
void OnRenderImage(RenderTexture source, RenderTexture destination)
{
UpdateView(HmdParameters.Instance, DisplayParameters.Collect());
Graphics.Blit(RenderTexture, destination, EyeMaterial);
}