在前进的同时更改FOV(视野)

Question

我有情况。我想在前进的同时顺利更改 FOV。在父类的相机设置中，我设置默认值：

FollowCamera->FieldOfView = 90.0f;

然后在向前移动功能中，我这样设置它

void AStarMotoVehicle::MoveForward(float Axis)
{
if ((Controller != NULL) && (Axis != 0.0f) && (bDead != true))
{ 
//Angle of direction of camera on Yaw
const FRotator Rotation = Controller->GetControlRotation();
const FRotator YawRotation(0, Rotation.Yaw, 0);
const FVector Direction = FRotationMatrix(YawRotation).GetUnitAxis(EAxis::X);
AddMovementInput(Direction, Axis);
FollowCamera->FieldOfView = 140.0f;
}

实际上它有效，所以当我继续前进时，FOV更改为140，但它非常粗略地工作并且立即发生。我想从 90 顺利地完成到 140。 你能帮我吗？

Answer 1

FInterpTo将为您制作： https://docs.unrealengine.com/en-US/API/Runtime/Core/Math/FMath/FInterpTo/index.html

每次调用"前进"时，fov 将增加到 140。 要减慢/加快转换速度，请减小/增加"互点速度"值

使用您的代码：

void AStarMotoVehicle::MoveForward(float Axis)
{
if ((Controller != NULL) && (Axis != 0.0f) && (bDead != true))
{ 
//Angle of direction of camera on Yaw
const FRotator Rotation = Controller->GetControlRotation();
const FRotator YawRotation(0, Rotation.Yaw, 0);
const FVector Direction = FRotationMatrix(YawRotation).GetUnitAxis(EAxis::X);
AddMovementInput(Direction, Axis);
// could check if World is valid
UWorld *World = GetWorld();

const float CurrentFOV = FollowCamera->FieldOfView;
const float InterpSpeed = 2.0f
FollowCamera->FieldOfView = FMath::FInterpTo(CurrentFOV, 
140.0f, 
World->GetTimeSeconds(),
InterpSpeed);
}