Toolbar buttons

• Open project: open an existing project, unsaved changes are lost
• Save project: saves the project
• Freeze renderer: disables the 3d view, useful for changing layers and settings without re-rendering after each single change or to stop a long computation
• Play/Pause: start or stop animation
• Capture screenshot: save screenshot of current scene to disk
• Capture camera path: save all images of selected camera path to disk