Viewport Callback Types

The sequence that Softimage follows when rendering a viewport looks like this:

Callback Type	siDisplayCallback Value To Use	Viewport Rendering Loop
Pre-begin Frame	siPreBeginFrame	Optionally set up an OpenGL P-buffer for real-time shadow rendering.
Begin Frame	siBeginFrame	Clear the OpenGL buffers (clear back buffer, Z-buffer, ...).
Post-begin Frame	siPostBeginFrame

Pre-Pass	siPrePass
Begin Pass	siPass	Render the scene using the viewport display mode. This is where you would call: CGraphicSequencer::RenderSceneUsingMode CGraphicSequencer::RenderSceneUsingMaterial CGraphicSequencer::RenderListUsingMode CGraphicSequencer::RenderListUsingMaterial
Post-Pass	siPostPass

Pre-end Frame	siPreEndFrame	Draw the grid and rulers and optionally save OpenGL Frame buffers.
End Frame	siEndFrame	Swap the OpenGL buffers.
Post-end Frame	siPostEndFrame
Post Frame Render (mr or render region)	siRenderFrame

Note

When more than one function is registered for a specific type of callback, their execution order is undefined.

Tip

Graphic sequencer plug-ins share the OpenGL state machine with Softimage. If a plug-in needs to change the OpenGL state, the plug-in should restore the original state when it is finished.