LÖVR
The star of the show, LÖVR is an open source framework to create VR applications easily. It’s built in C, with scripting done using LuaJIT to execute Lua code on the fly. It supports multiple HMD models, including both PCVR and Android based platforms, it’s extremely fast and responsive, with an active community and development team.
The project has an Official Website, with links to the Documentation, the GitHub for the code, a Matrix room and Slack group to talk with the devs.
The entire project is maintained under the MIT license.
How to use LÖVR
LOVR has very recently dropped its new 0.16 version, which has a lot of changes, both under the hood and for the user. The instructions here reference the older 0.15 version and its mechanisms. Be sure to use the correct docs on the LOVR Page
More information can be found at the Official Docs
After installing the framework on your device (see the docs), you will have a folder, such as /Project/, with a main.lua file. This file is the one to be executed by LÖVR.
LOVR executes the main file by executing the callbacks defined in it, like lovr.draw(). These callbacks are functions that LÖVR calls at specific moments. The most notable are:
lovr.load(), executed at the start of the programlovr.update(dt), used for physics and game logic, passing also thedtvalue of the delta time since the last calllovr.draw(), called at each frame to generate the image
LOVR also exposes a series of modules to execute functions, such as the lovr.headset module which gives access to things like headset and hands positions, number of tracked limbs and so on, or the lovr.graphics which gives us functions to draw models, textures and more.