Tears of Steel (code-named Project Mango) is a short science fiction film by producer Ton Roosendaal and director/writer Ian Hubert.

The film is both live-action and CGI; it was made using new enhancements to the visual effects capabilities of Blender, a free and open-source 3D computer graphics app.

Set in a dystopian future, the short film features a group of warriors and scientists who gather at the Oude Kerk in Amsterdam in a desperate attempt to save the world from destructive robots.

[2] Tears of Steel is the fifth project from the Blender Foundation, following Elephants Dream, Big Buck Bunny, Yo Frankie!

Atop of a modified, futuristic Oude Kerk, Barley (Sergio Hasselbaink) remotely activates the lights of a flying vehicle.

In a post credit scene, a breathless Barley is shown siting atop a heap of fallen robots, sipping mango juice.

The Mango Open Movie Channel on YouTube contains several videos explaining development and the techniques used by the team in making the film.

The material is available using the OpenEXR half float file encoding and makes up 4 TB of data for roughly 80,000 frames using a dimension of 4096 × 2160 pixels (see also Ultra HD).

It is the intention of the releasers to ease future developments for the film industry and other areas of image processing by making available this noticeably large amount of high definition professionally shot test data that has not been seen until now.

The results are a complete open source pipeline for visual effects work in Blender including but not limited to camera tracking, rotoscoping, compositing and color grading.