Simple camera (ofEasyCam replacement) for openFrameworks for quickly browsing your scene
Latest commit b082393 Feb 5, 2016 @elliotwoods better OGL 3.2 compatibility
fixed cursor size fix


Camera for browsing your 3D world in openFrameworks, which 'picks' the xyz position under the cursor, so all your mouse actions are performed relative to that point in 3D space.

  • Rotations and zoom are then performed with respect to that xyz position.
  • Rotations are performed using a trackball model.

Inspired by Google SketchUp (

Elliot Woods


ofxGrabCam (general)

Left click drag = rotate

Right click drag = zoom

hold 'h' whilst left click drag = pan

'r' key = reset

Example project

'c' = toggle draw cursor

'u' = toggle fix up vector


MIT License


  • We use glReadPixels to read back the depth buffer around the mouse cursor to find the XYZ position
  • Reading back the depth buffer happens only when required (e.g. mouse down/dragged, or when you enable the 3D cursor)
  • Reading back all the time may reduce your frame rate, so make sure to leave the cursor disabled (default) if you want a higher frame rate.


"this is basically the best thing ever." - kyle mcdonald

"this is absolute crap" - golan levin