• 抛物线、导弹线轨迹计算


    转自:http://www.cnblogs.com/corgi/p/5405450.html

    三、示例代码

    void UParabolicMovementComponent::InitComputeParams()  
    {  
    //无目标时  
        if (!bHasTarget)  
        {  
    //      指定出射角度时计算方法  
    //      FQuat quat = UpdatedComponent->GetComponentQuat() * FQuat(Rotation);  
    //      DirHorz = quat.Rotator().Vector();  
    //      float Theta = DirHorz.Z / DirHorz.Size2D();  
    //      VerticalSpeed = HorzSpeed * tan(Theta);  
    //      DirHorz.Z = 0;  
            //指定最大高度时计算方法  
    DirHorz = UpdatedComponent->GetComponentRotation().Vector();  
            DirHorz.Z = 0;  
            DirHorz.Normalize();  
    //若无目标则默认G=980.0f  
            VerticalSpeed = FMath::Sqrt(2 * Gravity * MaxHeight);  
        }  
    //有目标时  
        else  
        {  
            DirHorz = GetTargetPosition() - GetHostPosition();  
            float HeightDist = DirHorz.Z;  
            DirHorz.Z = 0;  
            float Dist = DirHorz.Size();  
            DirHorz.Normalize();  
            TotalTime = Dist / HorzSpeed;  
            VerticalSpeed = (2.0f * (MaxHeight + FMath::Sqrt(MaxHeight*MaxHeight - MaxHeight*HeightDist))) / TotalTime;  
            Gravity = VerticalSpeed * VerticalSpeed / (2.0f * MaxHeight);  
            //VerticalSpeed = HeightDist / TotalTime + .5f * Gravity * TotalTime;  
        }  
        CurrentTime = 0;  
        StartPos = GetHostPosition();  
        Velocity = DirHorz * HorzSpeed + FVector::UpVector * VerticalSpeed;  
        UpdateComponentVelocity();  
    }  
      
    //计算当前时刻所在位置  
    void UParabolicMovementComponent::ComputeMovement(float DeltaTime, FVector& OutMoveDelta)  
    {  
        CurrentTime += DeltaTime;  
        if(bHasTarget)  
        {  
            if (CurrentTime >= TotalTime)  
            {  
                CurrentTime = TotalTime;  
                bStop = true;  
            }  
        }  
          
        float CurrentVertSpeed = VerticalSpeed - Gravity * CurrentTime;  
        float fVertDist = .5f * (VerticalSpeed + CurrentVertSpeed) * CurrentTime;  
        OutMoveDelta = StartPos + CurrentTime * HorzSpeed * DirHorz + fVertDist * FVector::UpVector - GetHostPosition();  
        Velocity = DirHorz * HorzSpeed + FVector::UpVector * CurrentVertSpeed;  
        //OutNewRotation = Velocity.Rotation().Quaternion();  
    }  

    导弹线轨迹计算

    物体以某个初速度方向出发后,先保持稳定线性速度,以一定角速度向目标点旋转,当速度方向和自身-目标方向的夹角小于一定角度后,速度方向立刻改为自身-目标方向,进行直线加速。

    void UMissleMovementComponent::InitComputeParams()  
    {  
        Dir = (UpdatedComponent->GetComponentQuat() * Rotation.Quaternion()).Rotator().Vector();  
        Dir.Normalize();  
        Velocity = Dir * StartSpeed;  
        CurrentSpeed = StartSpeed;  
        UpdateComponentVelocity();  
    }  
      
    void UMissleMovementComponent::ComputeMovement(float DeltaTime, FVector& OutMoveDelta)  
    {  
        float MinDist = GetMinimalDistance();  
        static const float fLimit = (float)cos(FMath::DegreesToRadians(LimitDegree));  
        FVector vDir;  
        vDir = GetTargetPosition() - GetHostPosition();  
              
        float fLeft = vDir.Size();  
        vDir.Normalize();  
        float fDist = CurrentSpeed * DeltaTime;       
        if (fDist >= fLeft)  
        {  
            fDist = fLeft;  
            bStop = true;  
        }  
      
        float fAngle = Velocity.GetSafeNormal() | vDir;  
        //如果小于最小距离;或者角度相近,使用直线  
        if (fLeft < MinDist || fAngle > fLimit)  
        {  
            CurrentSpeed += LinearAcc * DeltaTime;  
            OutMoveDelta = vDir * fDist;  
            Velocity = vDir * CurrentSpeed;  
        }  
        else  
        {  
            OutMoveDelta = Velocity * DeltaTime;  
            FVector vUp = Velocity ^ vDir;  
            vUp.Normalize();  
            FQuat q(vUp, RotationSpeed * DeltaTime);  
            Velocity = q.RotateVector(Velocity);  
        }  
        //OutNewRotation = Velocity.ToOrientationQuat();  
        //OutNewRotation = Velocity.Rotation().Quaternion();  
    }  
    float UMissleMovementComponent::GetMinimalDistance()  
    {  
        float d = 2.0f * StartSpeed / RotationSpeed;  
        return d;  
    }  
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  • 原文地址:https://www.cnblogs.com/sevenyuan/p/8444109.html
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