/// <summary>
/// Renders the reflection and refraction of ocean.
/// </summary>
private void RenderReflectionAndRefraction()
{
if (Camera.current == offscreenCamera)
{
return;
}
if (reflectionTexture == null || refractionTexture == null)
{
return;
}
if (mainCameraTransform == null)
{
mainCameraTransform = Camera.main.transform;
}
Camera mainCamera = Camera.mainCamera;
Matrix4x4 originalWorldToCamera = mainCamera.worldToCameraMatrix;
int cullingMask = ~(1 << 4) & renderLayers.value;
// Reflection pass.
float y = -transform.position.y;
Matrix4x4 reflectionMatrix = Matrix4x4.zero;
CameraUtility.CalculateReflectionMatrix(ref reflectionMatrix, new Vector4(0.0f, 1.0f, 0.0f, y));
offscreenCamera.backgroundColor = RenderSettings.fogColor;
offscreenCameraTransform.position = reflectionMatrix.MultiplyPoint(mainCameraTransform.position);
offscreenCameraTransform.rotation = mainCameraTransform.rotation;
offscreenCamera.worldToCameraMatrix = originalWorldToCamera * reflectionMatrix;
offscreenCamera.cullingMask = cullingMask;
offscreenCamera.targetTexture = reflectionTexture;
// Need to reverse face culling for reflection pass, since the camera is now flipped upside/downside.
GL.SetRevertBackfacing(true);
Vector4 cameraSpaceClipPlane = CameraUtility.CameraSpaceClipPlane(offscreenCamera, new Vector3(0.0f, transform.position.y, 0.0f), Vector3.up, 1.0f);
Matrix4x4 projection = mainCamera.projectionMatrix;
Matrix4x4 obliqueProjection = projection;
offscreenCamera.fieldOfView = mainCamera.fieldOfView;
offscreenCamera.aspect = mainCamera.aspect;
CameraUtility.CalculateObliqueMatrix(ref obliqueProjection, cameraSpaceClipPlane);
// Do the actual render, with the near plane set as the clipping plane. See the pro water source for details.
offscreenCamera.projectionMatrix = obliqueProjection;
if (!reflectionEnabled)
{
offscreenCamera.cullingMask = 0;
}
offscreenCamera.Render();
GL.SetRevertBackfacing(false);
// Refraction pass.
offscreenCamera.cullingMask = cullingMask;
offscreenCamera.targetTexture = refractionTexture;
obliqueProjection = projection;
offscreenCameraTransform.position = mainCameraTransform.position;
offscreenCameraTransform.rotation = mainCameraTransform.rotation;
offscreenCamera.worldToCameraMatrix = originalWorldToCamera;
cameraSpaceClipPlane = CameraUtility.CameraSpaceClipPlane(offscreenCamera, Vector3.zero, Vector3.up, -1.0f);
CameraUtility.CalculateObliqueMatrix(ref obliqueProjection, cameraSpaceClipPlane);
offscreenCamera.projectionMatrix = obliqueProjection;
offscreenCamera.Render();
offscreenCamera.projectionMatrix = projection;
offscreenCamera.targetTexture = null;
}