First person acceleration methods

[chilly aspen]

I would set the velocity, but the velocity frame of reference will change a lot during regular gameplay (swinging platforms, fast vehicles)
Lerp felt really good for acceleration and turning, but it didn't work with rotating platforms

[proven river]

Like I said before, if you want to accelerate faster: #💻┃code-beginner message

more force, lower mass

[chilly aspen]

I have tried, I still can't change directions fast enough

[proven river]

Even more force

even less mass

more torque

smaller moment of inertia

that's the only way when doing realistic force based physics to increase acceleration

Or, like I said, just use ForceMode.Acceleration and unity will do the math for you

[proven river]

You have to not be afraid of doing things like "if the user wants to turn around, use a greater amount of force than just normal forward acceleration"

Also it's possible you have some stuff in your code currently that is overwriting velocity etc.. and cancelling this stuff out.

[chilly aspen]

That's kinda my original question, I don't know the calculation for that vector

[proven river]

You just define how quickly you want to accelerate

[chilly aspen]

Nah, it's a fresh project

[proven river]

if you want to accelerate at 10 m/s^2, then you do cs rb.AddForce(10 * direction, ForceMode.Acceleration);

in FixedUpdate

to determine if the input vector is opposite the direction of the current velocity you can do something like:

if (Vector3.Dot(transformedInputVector, rb.velocity) < 0) {
  // input is generally against the current direction
}```

Basically you've got to have a really good understanding of vector math and the basic newtonian physics to get something that feels quite good.

[chilly aspen]

Okay, actually I think drag and low mass solved the sliding problem, but how do I enforce a max velocity based on the surface the player is grounded to?

[proven river]

raycast to the surface to determine what it is

then use cs rb.velocity = Vector3.ClampVelocity(rb.velocity, maxVelocityForSurface);

(or replace raycast with however you're doing your grounded check)

[chilly aspen]

It's a rotating sphere lol

Since the object is rotating, I have to somehow get the linear velocity of the contact point

[proven river]

Does the rotating object have a Rigidbody, and is it rotating with an angularVelocity?

If so you can use:

https://docs.unity3d.com/ScriptReference/Rigidbody.GetPointVelocity.html

[chilly aspen]

Woah, just like that, my problems are solved

Not sure if it'll be scaleable though, since eventually my planets won't be small enough to use rigidbody rotation. By then I'll have a sort of analog to that method though