tyFlex Modifier

The tyFlex modifier applies spring forces to mesh vertices based on their movement.

The tyFlex modifier is multi-threaded and has an internal cache that is only re-computed when necessary, making it a faster and more efficient alternative to 3ds Max’s built-in Flex modifier.

tyFlex Rollout


  • Ref frame: the initial reference frame for the force calculations. Spring forces will only be applied to mesh vertices after this frame.


  • Stiffness: the stiffness of the spring forces. Increasing this value causes mesh vertices to attempt to return to their resting positions at a higher velocity.

  • Damping: the damping of the spring forces. Vertex velocities will be multiplied by this value prior to integration. Increasing this value decreases the rate at which vertex velocities accumulate over time.


  • Affect: controls the overall influence of spring forces on the resulting mesh.

  • Use vertex selection: when enabled, spring forces will only be applied to selected vertices.


  • Reset on mesh change: when enabled, the internal tyFlex cache will be reset when the underlying geometry of the object is changed.

  • Reset on setting change: when enabled, the internal tyFlex cache will be reset when a tyFlex setting is changed.

  • Clear cache: manually clears the tyFlex cache. Useful for when either “reset on mesh change” or “reset on setting change” are disabled and a mesh/setting change is made, invaliding the previous cache.

Forces Rollout

  • Force list: the list of forces that will contribute to the motion of mesh vertices.

  • X/Y/Z %: the amount of axial influence the forces will have on mesh vertices.

  • Multiplier %: an overall multiplier for the forces.