Function UpdateFireflySwarm

TombEngine/Objects/Effects/Fireflies.cpp:255–420

    }

    void UpdateFireflySwarm()
    {
        constexpr auto FLEE_VEL = 1.5f;
        constexpr auto ALPHA_PAUSE_DURATION = 100.0f;

        static const auto SPHERE = BoundingSphere(Vector3::Zero, BLOCK(1 / 8.0f));

        if (FireflySwarm.empty())
            return;

        const auto& playerItem = *LaraItem;
        static float frameCounter = 0.0f;

        // Increment the counter variable in each frame.
        frameCounter += 1.0f;

        for (auto& firefly : FireflySwarm)
        {
            if (firefly.Life <= 0.0f || !firefly.on)
                continue;

            auto targetItem = firefly.TargetItemPtr;

            if (targetItem->ItemFlags[FirefliesItemFlags::RemoveFliesEffect])
            {
                firefly.r = 0;
                firefly.g = 0;
                firefly.b = 0;
                continue;
            }

            firefly.StoreInterpolationData();

            firefly.PositionTarget = Random::GeneratePointInSphere(SPHERE);

            int multiplierX = CLICK(targetItem->ItemFlags[FirefliesItemFlags::TriggerFlags] * 2);
            int multiplierY = CLICK(targetItem->ItemFlags[FirefliesItemFlags::TriggerFlags] * 4);
            int multiplierZ = CLICK(targetItem->ItemFlags[FirefliesItemFlags::TriggerFlags] * 2);

            auto spheroidAxis = Vector3(multiplierX, multiplierY, multiplierZ);
            auto itemPos = Vector3i(targetItem->Pose.Position.x, targetItem->Pose.Position.y - FIREFLY_RISE_UP_FACTOR, targetItem->Pose.Position.z);

            // Calculate desired position based on target object and random offsets.
            auto desiredPos = itemPos + Random::GeneratePointInSpheroid(firefly.PositionTarget, EulerAngles::Identity, spheroidAxis);
            auto dir = desiredPos - firefly.Position;

            auto dirs = dir.ToVector3();
            dirs.Normalize();
            auto dirNorm = dirs;

            // Define cohesion factor to keep fireflies close together.
            float distToTarget = dirs.Length();

            float targetVel = (distToTarget * FIREFLY_COHESION_FACTOR) + Random::GenerateFloat(3.0f, 5.0f);
            firefly.Velocity = std::min(targetVel, targetItem->Animation.Velocity.z - 21.0f);

            // If firefly is too far from target, increase velocity to catch up.
            if (distToTarget > FIREFLY_TARGET_DISTANCE_MAX)