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Add heading check

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This is typically not something that is in a manual, but rather taught
in the certification class an officer takes to use radar (in the USA).
The further off the road they sit to run radar, or the more of an angle
that sit to traffic, the less accurate the return will be. Instead of
requiring users to know how doppler works, simplify it and just not
return the vehicle.

The original idea stemmed from https://www.quora.com/How-does-police-radar-work-when-officers-are-perpendicular-to-the-road
This commit is contained in:
Ryan S
2020-03-11 23:02:08 -04:00
parent f678359fe6
commit b0d0fbe1ea
1 changed files with 18 additions and 2 deletions
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20
cl_radar.lua
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@@ -754,6 +754,22 @@ function RADAR:GetLineHitsSphereAndDir( c, radius, rs, re )
return false, nil
end
-- This function is used to check if the target vehicle is in the same general traffic flow as the player's vehicle
-- is sitting. If the angle is too great, then the radar would have an incorrect return for the speed.
function RADAR:IsVehicleInTraffic( tgtVeh, relPos )
local tgtHdg = GetEntityHeading( tgtVeh )
local plyHdg = GetEntityHeading( PLY.veh )
local hdgDiff = math.abs(tgtHdg - plyHdg)
if ( relPos == 1 and hdgDiff > 45 and hdgDiff < 135 ) then
return false
elseif ( relPos == -1 and hdgDiff > 45 and ( hdgDiff < 135 or hdgDiff > 215 ) ) then
return false
end
return true
end
-- This function is the main custom ray trace function, it performs most of the major tasks for checking a vehicle
-- is valid and should be tested. It also makes use of the LOS native to make sure that we can only trace a vehicle
-- if actually nas a direct line of sight with the player's vehicle, this way we don't pick up vehicles behind walls
@@ -787,8 +803,8 @@ function RADAR:ShootCustomRay( plyVeh, veh, s, e )
-- Check that the trace line intersects with the target vehicle's sphere
local hit, relPos = self:GetLineHitsSphereAndDir( pos, radius, s, e )
-- Return all of the information if the vehicle was hit
if ( hit ) then
-- Return all of the information if the vehicle was hit and is in the flow of traffic
if ( hit and self:IsVehicleInTraffic( veh, relPos ) ) then
return true, relPos, dist, entSpeed, size
end
end