FiveM 摄像头系统：自定义摄像机、CCTV 和电影镜头

为什么自定义摄像系统很重要

默认 GTA 摄像机适合一般游戏，但角色扮演服务器和自定义游戏模式常需专用摄像机行为。角色创建界面需轨道摄像机，允许玩家围绕角色旋转。过场动画需脚本摄像机路径和平滑过渡。闭路电视系统需固定监控视角。房产预览需飞行穿越摄像机。构建灵活摄像机系统处理所有用例，将显著提升服务器表现质量。本教程深入讲解 FiveM 摄像机 API，附带可立即使用的实际示例。

摄像头基础

FiveM 摄像头使用原生 CreateCam 和 CreateCamWithParams functions 创建。摄像机是具有位置、旋转和视野的实体。你可以创建多个摄像机并切换，或平滑插值从一个摄像机位置过渡到另一个。关键概念是通过脚本摄像机渲染会禁用正常游戏摄像机，因此需要小心处理切换回去的过渡。

-- client/camera_core.lua
local CameraSystem = {
    activeCam = nil,
    isActive = false,
}

function CameraSystem.Create(coords, rot, fov)
    local cam = CreateCamWithParams(
        'DEFAULT_SCRIPTED_CAMERA',
        coords.x, coords.y, coords.z,
        rot.x, rot.y, rot.z,
        fov or 60.0,
        false, 0
    )
    return cam
end

function CameraSystem.Activate(cam, transitionTime)
    transitionTime = transitionTime or 1000

    SetCamActive(cam, true)
    RenderScriptCams(true, true, transitionTime, true, false)

    CameraSystem.activeCam = cam
    CameraSystem.isActive = true
end

function CameraSystem.Deactivate(transitionTime)
    transitionTime = transitionTime or 1000

    RenderScriptCams(false, true, transitionTime, true, false)

    if CameraSystem.activeCam then
        SetCamActive(CameraSystem.activeCam, false)
        DestroyCam(CameraSystem.activeCam, false)
        CameraSystem.activeCam = nil
    end

    CameraSystem.isActive = false
end

-- Clean up on resource stop
AddEventHandler('onResourceStop', function(resourceName)
    if GetCurrentResourceName() ~= resourceName then return end
    if CameraSystem.isActive then
        CameraSystem.Deactivate(0)
    end
end)

角色创建的轨道摄像机

轨道摄像机围绕中心点旋转，玩家可通过拖动鼠标旋转视角。这是角色创建、服装店和理发店的标准摄像机。摄像机保持与目标固定距离，将鼠标移动转换为绕中心点的角度旋转。

-- client/orbit_camera.lua
local OrbitCam = {
    active = false,
    cam = nil,
    target = nil,
    distance = 2.0,
    angleH = 0.0,
    angleV = 20.0,
    minV = -30.0,
    maxV = 60.0,
    sensitivity = 0.3,
    fov = 45.0,
}

function OrbitCam.Start(targetEntity, distance, height)
    OrbitCam.target = targetEntity
    OrbitCam.distance = distance or 2.0
    OrbitCam.angleH = GetEntityHeading(targetEntity) + 180.0
    OrbitCam.angleV = 20.0

    local targetCoords = GetEntityCoords(targetEntity)
    local camPos = OrbitCam.CalculatePosition(targetCoords)

    OrbitCam.cam = CreateCamWithParams(
        'DEFAULT_SCRIPTED_CAMERA',
        camPos.x, camPos.y, camPos.z,
        0.0, 0.0, 0.0,
        OrbitCam.fov, false, 0
    )

    PointCamAtCoord(OrbitCam.cam, targetCoords.x, targetCoords.y, targetCoords.z + 0.5)
    SetCamActive(OrbitCam.cam, true)
    RenderScriptCams(true, true, 800, true, false)

    OrbitCam.active = true
    OrbitCam.UpdateLoop()
end

function OrbitCam.CalculatePosition(center)
    local hRad = math.rad(OrbitCam.angleH)
    local vRad = math.rad(OrbitCam.angleV)

    local x = center.x + OrbitCam.distance * math.cos(vRad) * math.sin(hRad)
    local y = center.y + OrbitCam.distance * math.cos(vRad) * math.cos(hRad)
    local z = center.z + 0.5 + OrbitCam.distance * math.sin(vRad)

    return vector3(x, y, z)
end

function OrbitCam.UpdateLoop()
    CreateThread(function()
        while OrbitCam.active do
            DisableAllControlActions(0)
            EnableControlAction(0, 1, true)   -- Mouse X
            EnableControlAction(0, 2, true)   -- Mouse Y
            EnableControlAction(0, 241, true)  -- Scroll Up
            EnableControlAction(0, 242, true)  -- Scroll Down

            -- Mouse rotation
            local mouseX = GetDisabledControlNormal(0, 1) * OrbitCam.sensitivity * 8.0
            local mouseY = GetDisabledControlNormal(0, 2) * OrbitCam.sensitivity * 8.0

            OrbitCam.angleH = OrbitCam.angleH - mouseX
            OrbitCam.angleV = math.max(OrbitCam.minV,
                math.min(OrbitCam.maxV, OrbitCam.angleV + mouseY))

            -- Scroll zoom
            if IsDisabledControlPressed(0, 241) then
                OrbitCam.distance = math.max(0.5, OrbitCam.distance - 0.1)
            elseif IsDisabledControlPressed(0, 242) then
                OrbitCam.distance = math.min(5.0, OrbitCam.distance + 0.1)
            end

            local targetCoords = GetEntityCoords(OrbitCam.target)
            local camPos = OrbitCam.CalculatePosition(targetCoords)

            SetCamCoord(OrbitCam.cam, camPos.x, camPos.y, camPos.z)
            PointCamAtCoord(OrbitCam.cam, targetCoords.x, targetCoords.y, targetCoords.z + 0.5)

            Wait(0)
        end
    end)
end

function OrbitCam.Stop()
    OrbitCam.active = false
    RenderScriptCams(false, true, 800, true, false)

    if OrbitCam.cam then
        SetCamActive(OrbitCam.cam, false)
        DestroyCam(OrbitCam.cam, false)
        OrbitCam.cam = nil
    end
end

摄像头插值和过渡

两个位置之间的平滑摄像机过渡为过场动画、房产导览和加载屏幕创造电影效果。FiveM 提供 SetCamActiveWithInterp 本地处理插值，但您也可以构建自定义缓动函数以更好控制过渡曲线。

-- client/camera_transition.lua
local function TransitionCamera(fromPos, fromRot, toPos, toRot, duration, fov)
    fov = fov or 50.0

    local camFrom = CreateCamWithParams('DEFAULT_SCRIPTED_CAMERA',
        fromPos.x, fromPos.y, fromPos.z,
        fromRot.x, fromRot.y, fromRot.z,
        fov, false, 0)

    local camTo = CreateCamWithParams('DEFAULT_SCRIPTED_CAMERA',
        toPos.x, toPos.y, toPos.z,
        toRot.x, toRot.y, toRot.z,
        fov, false, 0)

    SetCamActive(camFrom, true)
    RenderScriptCams(true, false, 0, true, false)

    -- Interpolate from first camera to second
    SetCamActiveWithInterp(camTo, camFrom, duration, 1, 1)

    Wait(duration)

    -- Clean up the first camera
    DestroyCam(camFrom, false)

    return camTo
end

-- Usage: Flythrough preview of a property
local function PropertyPreview(waypoints, duration)
    local perSegment = duration / (#waypoints - 1)
    local currentCam = nil

    for i = 1, #waypoints - 1 do
        local wp = waypoints[i]
        local nextWp = waypoints[i + 1]

        currentCam = TransitionCamera(
            wp.pos, wp.rot,
            nextWp.pos, nextWp.rot,
            perSegment, wp.fov or 60.0
        )
    end

    -- Return to gameplay camera
    Wait(500)
    RenderScriptCams(false, true, 1000, true, false)
    if currentCam then DestroyCam(currentCam, false) end
end

闭路电视监控摄像系统

闭路电视系统使用地图周围固定摄像头，玩家可以循环切换。每个摄像头都有预设的位置和旋转，系统应用后期处理效果以模拟安全录像的外观。此系统常用于警察局和商业内部。

-- client/cctv.lua
local CCTV = {
    cameras = {},
    currentIndex = 0,
    activeCam = nil,
    active = false,
}

function CCTV.AddCamera(name, coords, rot, fov)
    table.insert(CCTV.cameras, {
        name = name,
        coords = coords,
        rot = rot,
        fov = fov or 60.0,
    })
end

function CCTV.Start(startIndex)
    CCTV.currentIndex = startIndex or 1
    CCTV.active = true
    CCTV.SwitchTo(CCTV.currentIndex)

    CreateThread(function()
        while CCTV.active do
            -- Apply security camera filter
            SetTimecycleModifier('CAMERA_secuirity')
            SetTimecycleModifierStrength(1.0)

            DisableAllControlActions(0)
            EnableControlAction(0, 174, true) -- Left Arrow
            EnableControlAction(0, 175, true) -- Right Arrow
            EnableControlAction(0, 202, true) -- Escape

            -- Cycle cameras
            if IsDisabledControlJustPressed(0, 175) then
                local next = CCTV.currentIndex + 1
                if next > #CCTV.cameras then next = 1 end
                CCTV.SwitchTo(next)
            elseif IsDisabledControlJustPressed(0, 174) then
                local prev = CCTV.currentIndex - 1
                if prev < 1 then prev = #CCTV.cameras end
                CCTV.SwitchTo(prev)
            elseif IsDisabledControlJustPressed(0, 202) then
                CCTV.Stop()
            end

            Wait(0)
        end
    end)
end

function CCTV.SwitchTo(index)
    local data = CCTV.cameras[index]
    if not data then return end

    local newCam = CreateCamWithParams('DEFAULT_SCRIPTED_CAMERA',
        data.coords.x, data.coords.y, data.coords.z,
        data.rot.x, data.rot.y, data.rot.z,
        data.fov, false, 0)

    if CCTV.activeCam then
        SetCamActiveWithInterp(newCam, CCTV.activeCam, 500, 1, 1)
        Wait(500)
        DestroyCam(CCTV.activeCam, false)
    else
        SetCamActive(newCam, true)
        RenderScriptCams(true, true, 500, true, false)
    end

    CCTV.activeCam = newCam
    CCTV.currentIndex = index
end

function CCTV.Stop()
    CCTV.active = false
    ClearTimecycleModifier()
    RenderScriptCams(false, true, 800, true, false)

    if CCTV.activeCam then
        DestroyCam(CCTV.activeCam, false)
        CCTV.activeCam = nil
    end
end

摄像头系统最佳实践

• 完成后始终销毁摄像机。 未销毁的摄像头会导致内存泄漏。跟踪每个摄像头句柄并在 onResourceStop.
• 在摄像头序列期间禁用控制。 除非有意允许，玩家在脚本摄像机激活时不应能行走、射击或互动。
• 使用适当的视野(FOV)值。 正常游戏使用50-60视野角。电影镜头使用30-40视野角以获得远摄效果。宽广建立镜头使用70-90视野角。
• 在摄像机序列期间隐藏HUD。 使用 DisplayHud(false) 和 DisplayRadar(false) 在电影摄像机期间移除游戏元素。
• 在不同帧率下测试过渡效果。 摄像头插值在30fps与144fps下可能表现不同。请在低端硬件上测试以确保平滑表现。