Function PxHeightField_getTimestamp 

pub unsafe extern "C" fn PxHeightField_getTimestamp(
    self_: *const PxHeightField,
) -> u32

Returns the number of times the heightfield data has been modified

This method returns the number of times modifySamples has been called on this heightfield, so that code that has retained state that depends on the heightfield can efficiently determine whether it has been modified.

the number of times the heightfield sample data has been modified.