Vector3.Lerp - Constant speed between distance changes

Question

I'm lerping from object 1 to object 2. I want the rate at w$$anonymous$$ch object 1 travels to be the exact same, using Time.deltaTime or Time.time. So if the distance between object 1 and object 2 are 5 meters at one point, I want object 1 to travel at 1 meters per second. If they were 1,000 meters apart, I still want object 1 to travel 1 meter per second. I know the solution is right at my fingertips, but I can't figure it out. I know it's gotta do with Vector3.Distance(object1.transform.position, object2.transform.position) but I don't know what else to do!

If I have speed set defaultly at 2, what can I do to make sure that the Vector3.Lerp (obj1, obj2, Time.deltaTime * newSpeed) that the newSpeed is the correct speed (it's gotta be less than the original speed, w$$anonymous$$ch is 2 in t$$anonymous$$s case)? Thanks.

Answer 1

Best Answer

Answer by robertbu · Jul 12, 2014 at 05:01 AM

A solution is to use Vector3.MoveTowards() rather than Vector3.Lerp().

 transform.position = Vector3.MoveTowards(transform.position, other.position, Time.deltaTime * speed);

Speed is a variable you define and is measured in units per second. So if you set it to 1.0, your object will move at a constant 1.0 units per second no matter the distance. Note that in t$$anonymous$$s form of MoveTowards, the first parameter must be the current position of the object, not the starting position of the object.

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Firedan1176 · Jul 12, 2014 at 01:11 PM 0

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This is exactly what I was looking for! Thank you.

aanimation · Dec 29, 2014 at 06:41 AM 0

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great..its working

Answer 2

Answer by RodrigoSeVeN · Oct 15, 2019 at 10:17 PM

Vector3.MoveTowards() is likely the best approach, but here's the answer for Lerp:

         float distance = Vector3.Distance(object1.transform.position, object2.transform.position);
         float finalSpeed = (distance / newSpeed);
         transform.position = Vector3.Lerp(obj1, obj2, Time.deltaTime / finalSpeed);

Dividing Time.deltaTime by distance makes it move as you wanted.

Dividing distance by newSpeed changes the speed.

Now just find the best value for newSpeed (might need to increase it a little).

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DavidSof · Dec 18, 2021 at 09:01 PM 1

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oo man thank you save my day

Answer 3

Answer by Masserz · Feb 03, 2015 at 03:41 AM

Thanks, I use both:

transform.position = Vector3.MoveTowards (transform.position, other.position, Time.deltaTime * speed / 2);

transform.position = Vector3.Lerp (transform.position, other.position, Time.deltaTime * speed / 2);

to balance the Lerp acceleration and linear effects. Is there a better way of doing t$$anonymous$$s?

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$$anonymous$$ · Oct 15, 2019 at 09:11 PM 0

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I haven't figured it quite out yet, but you would need a Mathf.Lerp function for the third MoveTowards parameter.

Vector3.Lerp - Constant speed between distance changes

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