Cockpit camera

[bovine3dom]

I'm trying to create a cockpit camera (like http://www.ps3informer.com/playstation- ... t-view.jpg ) for a tram. Here's the code so far:

(This is all clientside btw)

function trainCam()
local theVehicle = getPedOccupiedVehicle(getLocalPlayer())
local x, y, z = getElementPosition(getLocalPlayer())
local rx, ry, rz = getElementRotation(getLocalPlayer())
local ry = y+1
local rx = x+(math.tan(math.deg(rz)))
setCameraMatrix(x, y, z+1, rx, ry, z+1)
end
 
function trainStart(theVehicle, seat)
if ((seat == 0) and (getElementModel(theVehicle) == 449)) then
addEventHandler("onClientRender", getRootElement(), trainCam)
else end
end
addEventHandler("onClientPlayerVehicleEnter", getLocalPlayer(), trainStart)
 
function trainStop(theVehicle, seat)
if ((seat == 0) and (getElementModel(theVehicle) == 449)) then
removeEventHandler("onClientRender", getRootElement(), trainCam)
setCameraTarget(getLocalPlayer())
else end
end
addEventHandler("onClientPlayerVehicleExit", getLocalPlayer(), trainStop)

It kind of works along 0* and 90* lines (although it seems to go in fairly random directions), but when you go around a corner, it spins around crazyily. I can't see why though

The logic behind the maths: http://j.imagehost.org/0403/MTA.png

Where the point (a,b) is the x and y position of the tram, and (a+tan(Z), b+1) is a second point along the direction of travel. I know I haven't made any allowances for instances where the direction of travel is 90*

Any ideas/solutions?

Thanks.

[DiSaMe]

Try changing

local rx = x+(math.tan(math.deg(rz)))

to

local rx = x+math.tan(math.rad(rz))

[bovine3dom]

I think I'll skip most of the maths and just use a 'fly on the nose' (i.e. create an invisible object, attach it to the train and have the camera look at that). That way I don't have to worry about the angle of elevation either, and it should be less resource hungry.

Btw, the solution to this problem is to use tan(Z) to find the x co-ordinate for -45

Cheers to Doomed_Space_Marine, I didn't realise that the function worked that way.

Code I'm using now (for those interested)

function trainCam()
local x, y, z = getElementPosition(gnat)
local cx, cy, cz = getElementPosition(fly)
setCameraMatrix(x, y, z, cx, cy, cz)
end
 
function trainStart(theVehicle, seat)
if ((seat == 0) and (getElementModel(theVehicle) == 449)) then
local x, y, z = getElementPosition(getLocalPlayer())
		fly = createObject(3803, x, y, z)
setElementAlpha(fly, 0)
		gnat = createObject(3803, x, y, z)
setElementAlpha(gnat, 0)
attachElements(fly, theVehicle, 0.7, 5, 0.6)
attachElements(gnat, theVehicle, 0.7, 3.5, 0.6)
addEventHandler("onClientPreRender", getRootElement(), trainCam)
else end
end
addEventHandler("onClientPlayerVehicleEnter", getLocalPlayer(), trainStart)
 
function trainStop(theVehicle, seat)
if ((seat == 0) and (getElementModel(theVehicle) == 449)) then
removeEventHandler("onClientPreRender", getRootElement(), trainCam)
setCameraTarget(getLocalPlayer())
destroyElement(fly)
destroyElement(gnat)
else end
end
addEventHandler("onClientPlayerVehicleExit", getLocalPlayer(), trainStop)