3D Graphics
===========

PyQtGraph uses OpenGL to provide a 3D scenegraph system. This system is functional but still early in development. 
Current capabilities include:
    
* 3D view widget with zoom/rotate controls (mouse drag and wheel)
* Scenegraph allowing items to be added/removed from scene with per-item transformations and parent/child relationships.
* Triangular meshes
* Basic mesh computation functions: isosurfaces, per-vertex normals
* Volumetric rendering item
* Grid/axis items

See the :doc:`API Reference </3dgraphics/index>` and the Volumetric (GLVolumeItem.py) and Isosurface (GLMeshItem.py) examples for more information.

Basic usage example::
    
    ## build a QApplication before building other widgets
    import pyqtgraph as pg
    pg.mkQApp()

    ## make a widget for displaying 3D objects
    import pyqtgraph.opengl as gl
    view = gl.GLViewWidget()
    view.show()

    ## create three grids, add each to the view
    xgrid = gl.GLGridItem()
    ygrid = gl.GLGridItem()
    zgrid = gl.GLGridItem()
    view.addItem(xgrid)
    view.addItem(ygrid)
    view.addItem(zgrid)

    ## rotate x and y grids to face the correct direction
    xgrid.rotate(90, 0, 1, 0)
    ygrid.rotate(90, 1, 0, 0)

    ## scale each grid differently
    xgrid.scale(0.2, 0.1, 0.1)
    ygrid.scale(0.2, 0.1, 0.1)
    zgrid.scale(0.1, 0.2, 0.1)
