About 'Adjusting Radius With A Curve'!

Unreal Courses Talk
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  • What is a curve?
  • Accessing a curve from C++.
  • Setting the radius from speed.

(Unique Video Reference: 14_AE_VR2)

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2

I’d like to make a suggestion about this lecture:

The player already has a maximum walking speed, which provides a definitive x axis limit for the curve. So in order to keep things scalable and for the ease of modification along the course of development, why not do it like this?:

Define the curve as a unit curve with all axes ranging from 0 to 1.

Define a variable called MaxSpeed of type Float, with the default value that you used in the curve (1000, I think)

In the BeginPlay function, get the character movement component and assign MaxSpeed variable the maximum speed the player character has.

UCharacterMovementComponent* CMC = GetCharacterMovement();
if (CMC) MaxSpeed = CMC->GetMaxSpeed();

So in the BlinkerUpdate function you can get a consistent blinker behaviour regardless of what the maximum speed is and without the need of updating the curve when the project defaults are changed:

if (BlinkerCurve) {
	float Vel = GetVelocity().Size();
	BlinkerMatDyn->SetScalarParameterValue("radius", BlinkerCurve->GetFloatValue(Vel / MaxSpeed));
}
3

That seems like a sensible thing to do.

4

Y AXIS DOES NOT SHOW UP!
image|690x367

Hi! I was wondering if you could help me. When I open the curve editor, the Y axis doesn’t show up and I don’t know how to make it. What can I do? thanks!

I have Unreal 4.26.1

5

That looks fine to me. Very much the same as the video:

image
image3064×1732 280 KB

You might just need to pan around the curve. Try the “Fit Horizontal” button.

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