I made this thermal vision effect with the Blender compositor. I used models I found on Blend Swap so I could focus on the effect itself: the scene "black_social" by Lukmanx and the character "Ranger" by Enthymeme. I made the clothes on the characters cover the heat of the body and the cloth on the balcony partially cover the head of the man in the upper half of the image. I used multiple render layers and saved out some properties like facing to achive this result. It was a great excercise.
