The delta (difference) time given in seconds between the previous and the current substep

The current substep delta time given as a fraction (between 0.0 and 1.0)

The current substep index (always < substeps)

The maximum amount of substeps. This is only validly useful if the user is not using adaptive stepping.

This is the minimum amount of substeps the framework uses.

This is true if the current substep is the last one taken.