Yes, almost everything is made in blender except for some textures which were painted in Substance Painter and volumetric effects like explosions which were generated in FumeFX and Houdini before being imported, rendered and composited in blender.
That was pretty cool. Thank you! I wish they talked a little more about the difficulties they faced and how they solved them. If I remember correctly Ton Roosendaal once said one of the purposes of the Blender Open Movie project is to showcase the Blender is capable of handling complex large projects. After 4 open movie project it must have matured enough that Tangent Animation was able to solve most of their problems themselves! Awesome!
https://www.youtube.com/watch?v=iZn3kCsw5D8
Yes, almost everything is made in blender except for some textures which were painted in Substance Painter and volumetric effects like explosions which were generated in FumeFX and Houdini before being imported, rendered and composited in blender.