Name: 1.6 加速矢量--代碼的性質 (1.6 Acceleration Vector - The Nature of Code)
Uploaded: 2021-01-14T10:17:31.000Z
Duration: 10 min 44 s
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I think this really is the last video in chapter 1 on vectors.

I'm going to add one more detail to this example

of the random walker, which is no longer called a walker.

And where I last left off with this example is

be seen here in the constructor p5.vector.random2d.

Now, you know that's a static function because I

And then that velocity-- every frame is added to the position.

And the mover is drawn as an ellipse at that position.

So I want to add one more concept to this video.

Acceleration will act as the building block for all

of the examples I'm going to show you in chapter 2

So acceleration plays a key role in any kind of physics engine

about the physics aspect of this and just add

Our mover object currently has a position and a velocity.

And we've established that the position is a vector that

describes relative to the origin where that object is

The velocity describes how the position changes over time.

Then the velocity is added to the position.

This velocity would be applied, applied, applied.

However, acceleration can be described as the change

So if this object, this mover, were to accelerate,

So it's accelerating and moving larger steps each frame.

But acceleration just means the change in velocity.

So that could mean it's changing its direction

That's an acceleration speeding up, turning.

All of those combined together-- that's an acceleration.

what I'm calling the motion 101 algorithm.

And that motion 101 algorithm can be found right here

before that, this.velocity add this.acceleration.

It's not changing its magnitude or direction

So now you can see that it's speeding up.

And it's almost as if there's this big fan

in a direction and blows the mover off in a direction.

You could see that it's-- turns ever so slightly.

This is most likely because whatever velocity it picks

is not the same direction as its acceleration.

To demonstrate what's happening here a bit more clearly,

I might do something like set the magnitude

of the acceleration to something much smaller.

So I'm still picking a random unit vector in some direction,

And I could also go back to putting the background

That might help us see the path that it's taking.

in a different direction from the initial velocity.

to something random every time an update--

So this is something resembling that original random walk.

So if it's picking it in the same direction

going to build up enough speed and fly off in that direction.

Now, there is another useful vector function

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1.6 加速矢量--代碼的性質 (1.6 Acceleration Vector - The Nature of Code)

aspect

constant

demonstrate

concept