koobas.hobune.stream
Mathf.Lerp Question
Hi, a really noob question, i got this code from the unity manual
// Fades from minimum to maximum in one second
var minimum = 10.0; var maximum = 20.0;
function Update () { transform.position = Vector3(Mathf.Lerp(minimum, maximum, Time.time), 0, 0); }
Now how would u make it instead of one second say 3 or 4? I tried Time.deltaTime * 4 but the results are weird.
EDITED: My goal is to move a gun (FPS) to the center of the screen when we zoom in roughly at the same speed as the cam FOV decreases then return it to the original position.
I have this code so far:
function LateUpdate () { if (Input.GetButtonDown ("Fire2")){ pressing = true; } if (Input.GetButtonUp ("Fire2")){ pressing = false; } // Calculate the desired distance if (pressing){ camera1.fieldOfView = Mathf.Lerp(camera1.fieldOfView, zoomFOV, Time.deltaTime * lerpSpeed); gun.localPosition = Vector3(Mathf.Lerp(minimum, maximum, Time.time ), -0.2390689, 0.4984837); DOF.enabled = true; } else if (!pressing) { camera1.fieldOfView = Mathf.Lerp(camera1.fieldOfView, normalFOV, Time.deltaTime * lerpSpeed);
gun.localPosition = Vector3(Mathf.Lerp(maximum, minimum, Time.time ), -0.2390689, 0.4984837);
DOF.enabled = false;
}
better understanding lerp and deltatime: http://answers.unity3d.com/questions/14288/can-someone-explain-how-using-timedeltatime-as-t-i.html?sort=oldest
This is a bad example, because it uses Time.time - it starts counting when the game begins, and never returns to zero, so you will only see this working once. It's better to do something like this:
var minimum = 10.0; var maximum = 20.0; var duration: float = 4; // duration in seconds var timer: float = 0; // set this to zero to repeat the cycle
function Update () {
transform.position = Vector3(Mathf.Lerp(minimum, maximum, timer), 0, 0);
timer += Time.deltaTime/time; // add time elapsed since last Update
}
EDITED: You can do that in a simpler manner. Since Mathf.Lerp(from, to, t) returns a value between from and to proportional to t, you can increment t from 0 to 1 when Fire2 is pressed, and return to 0 when it's released. This can be done by adding or subtracting Time.deltaTime/duration from the variable t. The variable t is clamped between 0 and 1, so when you press or release Fire2 t always take the same time to go or return.
var t: float = 0; var duration: float = 3;
function LateUpdate () { if (Input.GetButton("Fire2")){ // if fire2 pressed... DOF.enabled = true; // enable DOF t += Time.deltaTime/duration; // t goes towards 1 } else { // if fire2 not pressed... DOF.enabled = false; // disable DOF t -= Time.deltaTime/duration; // t goes towards 0 } t = Mathf.Clamp(t, 0, 1); // keep t between 0 and 1 camera1.fieldOfView = Mathf.Lerp(normalFOV, zoomFOV, t); gun.localPosition.x = Mathf.Lerp(minimum, maximum, t); }
Hi, thank you 4 the quick reply. $$anonymous$$y goal is to move a gun (FPS) to the center of the screen when we zoom in roughly at the same speed as the cam FOV decreases then return it to the original position.
I have this code so far:
function LateUpdate () {
if (Input.GetButtonDown ("Fire2")){ pressing = true; } if (Input.GetButtonUp ("Fire2")){ pressing = false; } // Calculate the desired distance if (pressing){ camera1.fieldOfView = $$anonymous$$athf.Lerp(camera1.fieldOfView, zoomFOV, Time.deltaTime * lerpSpeed);
gun.localPosition = Vector3($$anonymous$$athf.Lerp($$anonymous$$imum, maximum, Time.time ), -0.2390689, 0.4984837);
DOF.enabled = true;
} else if (!pressing) { camera1.fieldOfView = $$anonymous$$athf.Lerp(camera1.fieldOfView, normalFOV, Time.deltaTime * lerpSpeed);
gun.localPosition = Vector3($$anonymous$$athf.Lerp(maximum, $$anonymous$$imum, Time.time ), -0.2390689, 0.4984837); DOF.enabled = false; }
@Testing, simply EDIT your original question and put all the code, etc, in there.
Sheesh, I'd wish they'd fix the Lerp examples already, they're useless - or have been put there on purpose to confuse newbies :-(
Yes, the examples can only be understood by those who know already how it works.
I do it this simple way..
float temp; bool lerpStarted; float noOfSeconds;
void callThisToStartLerp() { temp = Time.time; lerpStarted = true; }
void Update() { if(lerpStarted) { transform.position = Vector3(Mathf.Lerp(minimum, maximum, (Time.time - temp)/noOfSeconds), 0, 0); } }
In this Way, You can use lerp for any no. of seconds defined in noOfSeconds. and you can use yield to false the bool var lerpStarted.
