Learn how to convert a 360 spherical image into a flat image you can paint over in Photoshop!

This technique is very common in VFX pipelines as it allows the matte painting department to work on entire sequences at once, using a single matte painting. Understanding the process of how to "unproject" a skydome while including the foreground plate is something usually only mastered by Mid-level and Senior-level artists, so being familiar with this technique will put you well ahead of the curve when a VFX opportunity comes your way.