Updating Rotations

Unity Engine
1

Hi; I’m using the MouseLook script provided with the FPS tutorial, and I have this piece of code embedded to serve as a ‘lock-on’ function:

if (Input.GetButton("Lockon")  target != null) {						
			Quaternion newRotation = Quaternion.LookRotation(target.position - transform.position);
			transform.rotation = originalRotation * Quaternion.Slerp (transform.rotation, newRotation, Time.deltaTime * 5);
		}

My issue is that the RotationX and RotationY variables are not updated with it, and I do not know how to extrapolate it from a Quaternion. As a result, when I let go of the Lock-On button, the camera snaps back to the ‘last’ position, which is not the behavior I desire.

Does anyone know how to do this?

2

Do you get the information you want from the quaternion’s Euler angles?

3

I was able to acquire the coordinates by acquiring the Euler Angles, yes, although for some reason x had become y, and y had become z.

Thank you for the reply, regardless.

4

I wish to utilize a function called ‘FindClosestEnemy’, but my MouseLook script is a .cs file and I get the following error when I attempt to declare:

FindClosestEnemy fce = GetComponent();
target = fce.FindClosestEnemy();

It says the type or namespace could not be found. How would I go about exposing this script to be used with MouseLook in C#?

5

Can you post the exact error? (The problem may be that you have a function other than a constructor with the same name as the class to which it belongs.)

6

Hi there, sorry for the late reply.

The exact error is:

Assets/Standard Assets/Camera Scripts/MouseLook.cs(46,33): error CS0246: The type or namespace name `FindClosestEnemy’ could not be found. Are you missing a using directive or an assembly reference?

On my First Person Controller GameObject, I have two scripts: MouseLook.cs, and FindClosestEnemy.js. I wish to use FindClosestEnemy in MouseLook, hence the line:

FindClosestEnemy fce = GetComponent();
target = fce.FindClosestEnemy();

7

Sorry, nevermind.

I decided to just re-write the script in .cs and add it as a method to the MouseLook script.

8

I need to be able to ‘draw’ lines across the screen and translate it to the world space. Currently I have such code:

var direction = transform.TransformDirection(Vector3.forward);
	var hit : RaycastHit;
	
	// Did we hit anything?
	if (Physics.Raycast (transform.position, direction, hit, range)) {
		// Apply a force to the rigidbody we hit
		if (hit.rigidbody)
			hit.rigidbody.AddForceAtPosition(force * direction, hit.point);
		
		// Place the particle system for spawing out of place where we hit the surface!
		// And spawn a couple of particles
		if (hitParticles) {
			hitParticles.transform.position = hit.point;
			hitParticles.transform.rotation = Quaternion.FromToRotation(Vector3.up, hit.normal);
			hitParticles.Emit();
		}

		// Send a damage message to the hit object			
		hit.collider.SendMessageUpwards("ApplyDamage", damage, SendMessageOptions.DontRequireReceiver);
	}

Which was taken from the FPS tutorial’s Machine Gun example. What I would like to be able to do is to make the raycast point at wherever the mouse is pointing rather than Vector3.forward. I’ve taken a look at ScreenPointToRay but I cannot seem to get it to work, because I do not have a camera object…[/code]

9

There’s an example of how to use a raycast from the camera here. If you can see anything in the scene, then you must have a camera somewhere. It is probably the main camera that is in the scene by default. You can access it from a script using Camera.main.

10

Thank you very much for that, that worked wonderfully.

The next step I am uncertain about is how to create a ‘beam’; I wish to create a ‘melee’-effect with the Particle Emitter, similar to how a laser sword or some other type of drawn line would behave.

Does anyone have any suggestions?

11

Using the particle system is fairly straightforward, but you will probably have to experiment a bit to get the exact effect you want. Try using the Particles/Additive shader for the particle material. You can make them emit from a single line using an ellipsoid emitter, but with the ellipsoid set so that two of the axes are set to zero. (For example, set the ellipsoid’s X and Z components to zero to emit along the Y axis.) You will probably want to use a high emission rate and low energy (probably less than 0.5) to leave a slight trail without having a cloud of particles hanging around.

12

I am having trouble getting a grasp of when to enable my LineRenderer and when to turn it off.

I would like to have the effect appear when the user presses the Fire1 button, and make it go away when he releases it. Where would I put the linerender.enabled = true and false?

13

Alright; so I have a script that essentially is a melee weapon – it uses a LineRenderer object that is set to enabled = true when the player presses the Fire1 button.

I’ve tried several things, but I am not able to consistently turn it off when it’s done – I’ve tried putting it in LateUpdate and Update, but it isn’t guaranteed that the renderer will be disabled every time I release the button.

How may I fix this?