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Overview

Stride Modifier dynamically adjusts legs and pelvis motion to match the player trajectory and velocity.

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Bone References

  • Pelvis — pelvis bone reference.
  • Left Foot — left foot bone reference.
  • Right Foot — right foot bone reference.
  • Left Foot IK Target — left foot IK target reference. This can be a special IK bone or CAS-generated IK foot_l.
  • Right Foot IK Target — right foot IK target reference. This can be a special IK bone or CAS-generated IK foot_r.

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Warping Settings

The Warping feature adjusts leg rotation to align with the movement trajectory and scales stride length based on the player’s velocity.
  • Is Enabled — turns the warping feature on or off.
  • Stride Smoothing — controls how quickly the stride scale interpolates to its target value.
  • Min Stride Scale — sets the minimum allowed stride length ratio.
  • Max Yaw Angle — defines the maximum allowed yaw rotation angle.
  • Feet Smoothing — controls how quickly the feet rotate to align with the trajectory.
  • Lean Smoothing — controls the interpolation speed of the pelvis lean.
  • Pelvis Roll Scale — sets the intensity of the pelvis roll rotation.
  • Leg Hip Rotation — sets the intensity of the leg rotation toward the trajectory.

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Pinning

The Pinning feature locks the feet in world space when they make contact with the surface, helping reduce foot sliding.
  • Is Enabled — enables or disables the pinning feature.
  • Leg Stretch Factor — defines the maximum allowed leg stretch.
  • Pin Yaw Threshold — if this angle is exceeded, the feet become unpinned.
  • Angular Pin Threshold — if the foot pitch angle is below this threshold, the foot may become pinned.
  • Pin Smoothing — controls how quickly the foot interpolates when pinning or unpinning.
  • Pin Height Offset — controls the height range at which a foot can be pinned.

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Use-cases

The Stride Modifier is generally used to create a more realistic character motion and reduce foot sliding. To use it in your project, first add a Character Trajectory component to the character model.
  • Past Trajectory Points — number of past trajectory points.
  • Future Trajectory Points — number of future trajectory points.
  • Trajectory Time Delta — time step in seconds between each trajectory point.
  • Draw Gizmos — toggles trajectory gizmos.
Next, add a Stride Modifier to your Procedural Animation settings and place it before Foot IK and Step Modifiers.
Note: The default settings are designed to work well with most characters, so they can usually be used without modification
Next, it’s crucial to pre-process all movement animations used in your project. Go to Tools ▸ KINEMATION ▸ Stride Curves, assign the Character Model, drag and drop your animations and press “Compute Stride Curves”. This action will add StrideWeight, StrideSpeed, StrideX and StrideY float curves to all processed animation clips. Finally, add these float parameters to your Animator Controller.