Method updateFallState

src/main/java/net/minecraft/entity/Entity.java:1053–1075

(double y, boolean onGroundIn, Block blockIn, BlockPos pos)

    }

    protected void updateFallState(double y, boolean onGroundIn, Block blockIn, BlockPos pos)
    {
        if (onGroundIn)
        {
            if (this.fallDistance > 0.0F)
            {
                if (blockIn != null)
                {
                    blockIn.onFallenUpon(this.worldObj, pos, this, this.fallDistance);
                }
                else
                {
                    this.fall(this.fallDistance, 1.0F);
                }

                this.fallDistance = 0.0F;
            }
        }
        else if (y < 0.0D)
        {
            this.fallDistance = (float)((double)this.fallDistance - y);
        }
    }

    /**
     * Returns the collision bounding box for this entity