koobas.hobune.stream
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How to move forward (towards z), ignoring any rotations?
Hello. I have an object that moves forward along its z axis when you press w, but the object will move up or down if either x or y have any values. I want to ignore these axis and move only forward.
example, you are walking forward with your head tilted down. your body moves forward, not down towards where you are looking.
What im trying to do is make a basic arcadey style helicopter controls. When you push forward, the helicopter moves forward, but to make it looks a bit more "real" the helicopter tilts forward about 15 degrees. When this occurs, the helicopter then travels forward and down. I want to just have the helicopter move forward, not down as well.
(im using Unity5.5.0f3)
heres my code (editing out the irrelevant parts):
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
public class ApacheScript : MonoBehaviour{
public Rigidbody helicopterRigidbody;
private float leftRightRot;
private float frontBackRot;
private float leftRightMin;
private float leftRightMax;
private float frontBackMin;
private float frontBackMax;
private Quaternion zRotation;//leftRight
private Quaternion xRotation;//frontBack
private Vector3 temp;
private float enginePower = 1000f;
public bool isOnGround = true;
void Start (){
leftRightRot = 0f;
leftRightMax = 30f;
leftRightMin = -30f;
frontBackMin = -15f;
frontBackMax = 15f;
frontBackRot = 0;
helicopterRigidbody = gameObject.GetComponent<Rigidbody> ();
}
void Update () {
temp = transform.eulerAngles;
if (Input.GetKey (KeyCode.W)) {
helicopterRigidbody.drag = 1;
helicopterRigidbody.useGravity = false;
transform.Rotate (2, 0, 0);
helicopterRigidbody.AddForce(transform.forward * (70f * enginePower));
}
if (Input.GetKey (KeyCode.S)) {
helicopterRigidbody.drag = 1;
helicopterRigidbody.useGravity = false;
transform.Rotate (-2, 0, 0);
helicopterRigidbody.AddForce(transform.forward * (-40f * enginePower));
}
if (temp.z > 31f && temp.z <= 180f) {
temp.z = 30f;
transform.eulerAngles = temp;
} else if (temp.z > 180f && temp.z < 329f) {
temp.z = 330f;
transform.eulerAngles = temp;
}
if (temp.x > 16f && temp.x <= 180f) {
temp.x = 15;
transform.eulerAngles = temp;
} else if (temp.x > 180f && temp.x < 344) {
temp.x = 345;
transform.eulerAngles = temp;
}
}
}
Should work if you use Vector3.forward instead of transform.forward. the transform forward vector is the blue axis relative to world space.
This works until the helicopter turns (rotates), then "forward" isn't forward relative to the way the helicopter is facing.
I made it work by using the local transform.forward, and then compensating for the downward motion by adding a slight amount of force pushing the rigidbody up. Took a bit of tweaking, but works fine.
