Are hilliness and windingness supported in the SDK for any type of vehicle?

Yes. First, you need to select the right vehicle value in the RoutePlanningOptions class / struct.

Then, you need to choose the Thrilling option from the route type parameter, which specifies the type of optimization used when calculating routes.

For the Thrilling route type, the route calculation is optimized so that routes include interesting or challenging roads and use as few motorways as possible.

You can choose the level of turns included and also the degree of hilliness. See the hilliness and windingness parameters to set this.