NUKE TO MAYA Workflow : Perfecting the look
Whales Floating in the sky
Animation of a whale flying in an actual video footage of a scenery
Painting and textures in Mudbox( normal maps, specular maps, diffuse maps)
Rigging in Maya, Animating in Maya
Compositing in Nuke
3d model: blue whale, https://free3d.com/3d-model/big-whale-30320.html