PointCloudLibrary/pcl — pull request #306 by nizar-sallem (2013-10-09 12:00:08+00:00)
Title: Add: processing of alpha channel in color handlers

PCLVisualizer had no ability to play with transparency since alpha channel is discarded.
Now you could show/hide points using the alpha field and the new PointCloudColorHandlerRGBAField.
This fixes #301