Here’s a quick and dirty tutorial explaining how to connect MadMapper and VDMX.
You’ll need the latest beta of VDMX, beta 0.8.x.x or greater.

Note that you can click the images to make them bigger.

STEP #1:
First, launch VDMX and place a movie file in your media bin:
This will launch the clip on layer 1.

STEP #2:
Go to the Plugins section of your workspace inspector,
click the + sign, in order to add a plugin.
Then select the Syphon Output so that you will be able to send video frames to MadMapper.

STEP #3:
Select which part of your process you want to send to MadMapper.
Here we’ll be sending the Main Out of VDMX, that being the final composite of your VDMX FX chain.

STEP #4:
Launch MadMapper.
VDMX Main Out will Automatically appear in the Syphon section of your inputs.
Double click it and MadMapper will display the frames in the Input View.

STEP #5:
Now you can start creating primitives in MAdMapper and selecting which parts of the video coming from VDMX
are applied to which portions of the space you are projecting in: