Creating ambient occlusion in Material graph without AO map

Development Rendering
1

I recall seeing a technique somewhere that showed how to create Ambient Occlusion in your Material graph without using an actual AO map.
Does anyone know of this technique?

2

You could try with the DistanceToNearestSurface technique:

You can also use the blue channel of the Normal map, and mess with contrast etc; which usually is similar to curvature/ao.

3

Great tips!