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Need help with Camera rotation in a 3D Tetris game please?

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I need my camera to rotate around the tetris grind box in all directions. I wrote the Input code:
case WM_INPUT:
		{
			RAWINPUT RawInput;
			UINT DataSize = sizeof(RAWINPUT);
			GetRawInputData((HRAWINPUT) lParam,
							RID_INPUT,
							&RawInput,
							&DataSize,
							sizeof(RAWINPUTHEADER));
			
			if (RawInput.data.mouse.usButtonFlags == RI_MOUSE_LEFT_BUTTON_DOWN)			// If Left mouse button is down
			{
				Input.RotateCamera = true;
				Input.MouseChangeX += RawInput.data.mouse.lLastX;
				Input.MouseChangeY += RawInput.data.mouse.lLastY;
			}
// Omitted code that Zooms in and out on the scene
}
Sadly, i have no idea what to do next. How can i use the x and y values i obtained to rotate the camera in 3 directions while keeping a constant distance from the grid box :S

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