Of the techniques available for projection mapping, 3D projection mapping is one of the more interesting and accurate options available. Instead of relying on drawing masks, 3D projection mapping uses a 3D model of the projection surface, a virtual camera and some math to calibrate the projection. Although it takes a little more upfront effort (you need an accurate 3D model of the surface), it makes calibration a snap.You’re probably thinking: “Great, sounds expensive!”. Actually, TouchDesigner includes 3D projection mapping functionality right out of the box! We’ll take a look at this more later.In this article, we’ll dive into 3D projection mapping, review the benefits and the downsides of the technique, and finally look at how you can use this mapping technique in TouchDesigner.