Projection mapping addon for openFrameworks that runs on the Raspberry Pi.

The project started as master's thesis project by Krisjanis Rijnieks at the Helsinki Media Lab. Currently undergoing changes. Expect the API to be incompatible with your projects from the past or present-day.

You can use the example application of the addon for projection mapping projects where static images or videos have to be projection mapped. Make sure you are using the latest stable version of openFrameworks.

1. Put your own sources in the example/bin/data/sources directory. Use Handbrake with the Fast 720p30 preset to encode your videos.

2. Compile and run the example project.

   cd openFrameworks/addons/ofxPiMapper/example
   make && ./bin/example

3. Use the -f flag to launch it fullscreen.

   ./bin/example -f

There might be issues with compiling because ofxOMXPlayer and ofxRPiCameraVideoGrabber addons do not exist on Linux and also other non-RPi platforms. To avoid the issues, do the following.

1. Open example/addons.make and remove ofxOMXPlayer line.
2. Open example-camera/addons.make and remove ofxRPiCameraVideoGrabber line.
3. Compile one or both examples by using make.

If you are having problems with audio playback, here are two steps for you. Before you do these, make sure audio of your video file works.

Open example openFrameworks application ofApp.cpp file in a text editor.

cd /home/pi/openFrameworks/addons/ofxPiMapper/example
nano src/ofApp.cpp

Make sure that the following line looks as follows.

ofx::piMapper::VideoSource::enableAudio = true;

Save the file (CTRL + X, Y and ENTER). Recompile and run the example.

make && make run

If the sound still does not work, try to use raspi-config.

sudo raspi-config

Select "7 Advanced Options" and "A9 Audio" then "0 Auto". You can use one of the force options if you want to be 100% sure.

Open alsamixer.

alsamixer

Set the volume to a value between 90 to 100 by using the arrow keys. ESC to exit the mixer.

Launch ofxPiMapper example, select a surface and set a video source with audio. Should work.

Keeping it simple. Developing ofxPiMapper master branch against the latest stable release version of openFrameworks.

ofxPiMapper is distributed under the MIT License. See the LICENSE file for further details. Just add my name somewhere along your project Krisjanis Rijnieks whenever possible. And join my workshops.

Before moving on, make sure that you have all the dependencies installed.

• ofxGui (available in oF by default)
• ofxXmlSettings (available in oF by default)
• ofxOMXPlayer (needed only on Raspberry Pi)

To install dependencies, cd into openFrameworks/addons directory and execute the following:

git clone https://github.com/jvcleave/ofxOMXPlayer.git

The ofxOMXPlayer addon recommends you to use its releases. Currently the latest release is 0.9.0-compatible. To checkout the code of the relase, go to the ofxOMXPlayer addon directory and checkout the relase.

cd openFrameworks/addons/ofxOMXPlayer
git checkout 0.9.0-compatible

You can check the latest releases on the ofxOMXPlayer GitHub repository.

Currently a keyboard and a mouse has to be used in order to do the mapping with ofxPiMapper.

PiMapper has 4 modes:

1. Presentation mode
2. Texture mapping mode
3. Surface editing mode
4. Source assignment mode

You can access these modes by pressing 1, 2, 3 or 4 respectively.

This mode is activated once the application starts up. It does not show anything else except the final projection mapping as it was saved previously.

In this mode you can adjust the texture coordinates of the surface you have selected in the surface editing mode.

Here you can select, move and distort the surfaces you have created.

After you select a surface in surface editing mode, activate this mode to be able to choose a source for the surface. Afterwards you might want to go to the texture mapping mode to adjust texture coordinates.

These other shortcuts that you can use while using the example app.