RedM Camera Helper

RedM_CameraHelper.lua

--[[
Copyright 2022 ZeroDream
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
]]--

CameraHelper = {
    GetPosition = function()
        return GetGameplayCamCoord()
    end,
    GetRotation = function(unk)
        return GetGameplayCamRot(unk)
    end,
    DegToRad = function (degs)
        return degs * 3.141592653589793 / 180 
    end,
    RotationToDirection = function(rotation)
        local z   = math.rad(rotation.z)
        local x   = math.rad(rotation.x)
        local num = math.abs(math.cos(x))
        return vector3(-math.sin(z) * num, math.cos(z) * num, math.sin(x))
    end,
    WorldToScreenRel = function(worldCoords)
        local check, x, y = GetScreenCoordFromWorldCoord(worldCoords.x, worldCoords.y, worldCoords.z)
        if not check then
            return false
        end
        screenCoordsx = (x - 0.5) * 2.0
        screenCoordsy = (y - 0.5) * 2.0
        return true, screenCoordsx, screenCoordsy
    end,
    ScreenToWorld = function(giveX, giveY)
        local camVec2, camVec21
        camRot     = CameraHelper.GetRotation(2) + vec3(0, 45.0, 0.0)
        camPos     = CameraHelper.GetPosition()
        direction  = CameraHelper.RotationToDirection(camRot)
        camVec3    = camRot + vec3(10.0, 0.0, 0.0)
        camVec31   = camRot + vec3(-10.0, 0.0, 0.0)
        camVec32   = camRot + vec3(0.0, 0.0, -10.0)
        direction1 = CameraHelper.RotationToDirection(camRot + vec3(0.0, 0.0, 10.0)) - CameraHelper.RotationToDirection(camVec32)
        direction2 = CameraHelper.RotationToDirection(camVec3) - CameraHelper.RotationToDirection(camVec31)
        local rad  = CameraHelper.DegToRad(camRot.y)
        camVec33   = (direction1 * math.cos(rad)) - (direction2 * math.sin(rad))
        camVec34   = (direction1 * math.sin(rad)) + (direction2 * math.cos(rad))
        local find, screenX, screenY = CameraHelper.WorldToScreenRel(((camPos + (direction * 10.0)) + camVec33) + camVec34)
        if not find then
            return camPos + (direction * 10.0)
        else
            camVec2 = vec2(screenX, screenY)
        end
        local find2, screenX2, screenY2 = CameraHelper.WorldToScreenRel(camPos + (direction * 10.0))
        if not find2 then
            return camPos + (direction * 10.0)
        else
            camVec21 = vec2(screenX2, screenY2)
        end
        if math.abs(camVec2.x - camVec21.x) < 0.001 or math.abs(camVec2.y - camVec21.y) < 0.001 then
            return camPos + (direction * 10.0)
        end
        local x = (giveX - camVec21.x) / (camVec2.x - camVec21.x)
        local y = (giveY - camVec21.y) / (camVec2.y - camVec21.y)
        return ((camPos + (direction * 10.0)) + (camVec33 * x) + (camVec34 * y))
    end,
    RaycastForEntity = function(screenCoord, ignoreEntity, maxDistance)
        local world   = CameraHelper.ScreenToWorld(screenCoord.x, screenCoord.y)
        local camVec3 = CameraHelper.GetPosition()
        local camVec4 = world - camVec3
        camVec4       = norm(camVec4)
        local ray = StartShapeTestRay(camVec3 + (camVec4 * 1.0), camVec3 + (camVec4 * maxDistance), -1, ignoreEntity)
        local _, _, _, _, entity = GetShapeTestResult(ray)
        return entity
    end
}

-- Example for getting entity in middle of the screen
local entity = CameraHelper.RaycastForEntity(
  vec2(0.5, 0.5), -- Screen position vector2
  PlayerPedId(),  -- Ignore self
  10.0            -- Max distance
)
-- print entity id
print(entity)