UE开发小计：AlignActorToMouse

C++版

// Fill out your copyright notice in the Description page of Project Settings.


#include "HitWhereverYouWant.h"

#include "KismetTraceUtils.h"
#include "Kismet/GameplayStatics.h"

void UHitWhereverYouWant::AlignActorToMouse(AActor* ActorToAlign)
{
    const auto World = GWorld->GetGameInstance()->GetWorld();
    const APlayerController* PlayerController = UGameplayStatics::GetPlayerController(World, 0);
    if (PlayerController && ActorToAlign && World)
    {
        // 获取鼠标的屏幕坐标
        float MouseX, MouseY;
        if (PlayerController->GetMousePosition(MouseX, MouseY))
        {
            // 将屏幕坐标转换为世界空间中的一条射线（起点和方向）
            FVector WorldLocation, WorldDirection;
            if (PlayerController->DeprojectScreenPositionToWorld(MouseX, MouseY, WorldLocation, WorldDirection))
            {
                // 执行射线投射
                FHitResult HitResult;
                FVector StartPoint = WorldLocation;
                FVector EndPoint = StartPoint + WorldDirection * 10000.0f; // 射线长度可以根据需要调整
                FCollisionQueryParams CollisionParams;
                CollisionParams.AddIgnoredActor(ActorToAlign); // 忽略射线投射目标Actor本身

                bool bHit = World->LineTraceSingleByChannel(
                    HitResult,
                    StartPoint,
                    EndPoint,
                    ECC_Visibility, // 或者你需要的其他碰撞通道
                    CollisionParams
                );

                if (bHit)
                {
                    // 获取ActorToAlign的位置
                    FVector ActorLocation = ActorToAlign->GetActorLocation();

                    // 计算从ActorToAlign指向命中点的方向
                    FVector ToHitDirection = (HitResult.ImpactPoint - ActorLocation).GetSafeNormal();

                    // 计算新的旋转，使得ActorToAlign的Z轴指向命中点
                    FRotator NewRotation = FRotationMatrix::MakeFromZ(ToHitDirection).Rotator();

                    // 应用新的旋转到ActorToAlign
                    ActorToAlign->SetActorRotation(NewRotation);
                }
            }
        }
    }
}
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蓝图版

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