Rotate object with mouse

[lerby]

I wanna create an object, which will always look at mouse.
I am currently using OIS.

[Malarkey]

You could use Billboards http://www.ogre3d.org/tikiwiki/tiki-ind ... -billboard for 2D planes
or just calculate it manually for meshes

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const OIS::MouseState& mouseState = mouse->getMouseState();

mouseState.X / .Z / .Y give you a point in space where the cursor "is". Than you can update the Orientation of your object to the mouse position with sceneNode->setOrientation(xxx). No warrantys, I am also still a beginner.

And I think there was some inbuilt function to calculate an Quaternion which would rotate an Object automatically based on origin of the Object and the desired orientation target (but I don't remember the object / function name)

and may the subject should be "rotate object to mousePosition"

[Enhex]

You can get the mouse's world position using getCameraToViewportRay:

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Ogre::Ray ray = camera->getCameraToViewportRay(pixelX / camera->getViewport()->getActualWidth(),
									                    pixelY / camera->getViewport()->getActualHeight());
ray.getOrigin();

Where pixel(X/Y) is your mouse's screen position.

Then just use lookAt with the object that you want to look at it.