How to create a deformation of the landscape?

How to create a deformation of the landscape as in this video:

There is obviously quite a lot of graphics magic. Heightfield deformations and how they treated by physx are discussed in this nvidia blog post:



Note that if you accidentally create an interpenetration between your heightfield and your wheels (or any other part which interacts with the heightfield can give you some bouncy results. That is unless you’re using Physx 3.2.0 in which case it will give you an access violation instead. It appears that this was fixed in 3.2.1.