Filament is a PBR (physically based rendering) engine optimized for Android, but also works on Linux, macOS and Windows.
Filament is a tool made for Android developers who want to create high quality 2D and 3D rendering with ease. Filament features Native C++/Java/JNI API, OpenGL, Vulkan 1.0, HDR, Physical light units, MSAA and more. And they also support in-depth documents for Developers.
For more info: Download / PBR Guide / Material Guide / Material reference sheet
The game will release on this July. No specific release date announced.
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As I posted a while ago, Steam released app that allow players to play their game on smartphone.
Steam Link app is only available on Play Store now, iOS version is still pending review from Apple.
Valve announced the Steam Link app, which will let Steam users to play their games on Android and iOS devices.
Steam Link works by connecting to same WiFi / Ethernet(LAN) with your PC. And it will also be compatible with Steam controller and MFI controllers.
Steam Link will release at May 21.