Fix for Realistic FPS Prefab “Crouch Jump” Bug

In Realistic FPS Prefab v1.21 (by Azuline Studios), when you stand from a crouch, the player’s collider immediately expands vertically from the crouched height to the standing height. This puts a lot of downward force under the player, which can have an interesting effect if you’re standing on top of another physics object. Since the physics object has a rigidbody, you get an equal and opposite upward force, jettisoning the player into the air.

If you want to fix it, edit FPSRigidbodyWalker.cs. Around line 880, in the “//Crouching & Prone” section of FixedUpdate(), change this line:

capsule.height = standingCapsuleheight;

if (capsule.height < standingCapsuleheight) {
    if (Physics.Raycast(myTransform.position, -myTransform.up, out rayHit, rayCastHeight, clipMask.value) &&
        (rayHit.collider.GetComponent<Rigidbody>() != null)) {
        capsule.height = Mathf.Min(capsule.height + 4 * Time.deltaTime, standingCapsuleheight);
    } else {
        capsule.height = standingCapsuleheight;
    }
}