OpenNI 1.5.7
Configuring nodes

An application would usually want to fully configure a node before it starts streaming data. For that reason, OpenNI defines a flow in which configuration can take place, and once all configuration is set, the node xn::Generator::StartGenerating() method can be called to make it start streaming the data.

The following code creates a depth generator, configures it to VGA resolution, 30 FPS, and then starts it:

// Create a DepthGenerator node
nRetVal = depth.Create(context);
// TODO: check error code
XnMapOutputMode outputMode;
outputMode.nXRes = 640;
outputMode.nYRes = 480;
outputMode.nFPS = 30;
nRetVal = depth.SetMapOutputMode(outputMode);
// TODO: check error code
// We're done configuring it. Make it start generating data
nRetVal = context.StartGeneratingAll();
// TODO: check error code
// Main loop
while (bShouldRun)
{
// Wait for new data to be available
nRetVal = context.WaitOneUpdateAll(depth);
if (nRetVal != XN_STATUS_OK)
{
printf("Failed updating data: %s\n", xnGetStatusString(nRetVal));
continue;
}
// Take current depth map
const XnDepthPixel* pDepthMap = depth.GetDepthMap();
// TODO: process depth map
}