History: Ogre iPhone FAQ

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            !!Issues and Troubleshooting

* Viewport::SetOrientation must be called after a frame is rendered to take effect. For example to change to Viewport::OR_PORTRAIT:

{CODE(wrap="1", colors="c++")}mRoot->renderOneFrame();
mCamera->getViewport()->setOrientation(Viewport::OR_PORTRAIT);{CODE}

* Current state of Viewport::OR_LANDSCAPELEFT (default value) has known issues related with camera frustum, that deliver early entity clipping and problems with getCameraToViewportRay. Change to OR_PORTRAIT while this problem is resolved.

Until the issue is fixed here is a workaround.  As a side effect of this, the x and y values of input will be swapped.  Your code will need to take this into account.

{CODE(wrap="1", colors="c++")}Ogre::Camera *camera = mCameraMan->getCamera();
if (camera)
{
	int width = camera->getViewport()->getActualWidth();
	int height = camera->getViewport()->getActualHeight();

	camera->setProjectionType(Ogre::PT_ORTHOGRAPHIC);
	camera->setAspectRatio(Ogre::Real(width) / Ogre::Real(height));

	// Use PORTRAIT and rotate the projection matrix
	camera->getViewport()->setOrientation(Viewport::OR_PORTRAIT);
	camera->setOrthoWindowWidth(block_dim*(num_blocks_y+1));
	Matrix4 proj = camera->getProjectionMatrix();
	proj = proj * Quaternion(Degree(-90), Vector3::UNIT_Z);
	camera->setCustomProjectionMatrix(true, proj);
}{CODE}