Camera matrix to velocity direction

[Gallardo9944]

Hello.

I'm looking for a way to make an element "boost" into the direction of the camera. Obviously, it has to be done with matrix stuff. I'm not fond of matrix-related stuff, so yeah, I'd like to set element's velocity to +1 into the camera direction point. Any tips or examples?

Thanks in advance.

[Damien_Teh_Demon]

You need to use math to get the forward direction of the perspective of the camera, and then set velocity of player that direction using math again in a similar way. Search setting velocity forward, or spawning something infront of a player.

[Gallardo9944]

well, getting a vector is not a huge deal, but getting the damn velocity... Here's what I have for now:

local vehicle = getPedOccupiedVehicle(localPlayer) 
local mx,my,mz,mpx,mpy,mpz = getCameraMatrix() 
local vector = {mx-mpx,my-mpy,mz-mpz} 

And I'm stuck at this point.

[Damien_Teh_Demon]

I think theres a post with a good example, here : viewtopic.php?f=91&t=46007

[Gallardo9944]

The code is pretty much useless cause it doesn't do what expected. Always throws me in 1 direction.

[Gallardo9944]

Okay i found it out myself. Posting the code if someone needs:

local vehicle = getPedOccupiedVehicle(localPlayer) 
local mx,my,mz,mpx,mpy,mpz = getCameraMatrix() 
local vector = {mx-mpx,my-mpy,mz-mpz} 
setElementVelocity(vehicle,-vector[1],-vector[2],-vector[3]) 

It doesn't calculate the difference between velocities, but in fact it does set the direction.

[Damien_Teh_Demon]

Sorry, i didnt check it, i was in class.

[arezu]

It doesn't calculate the difference between velocities, but in fact it does set the direction.

If you still need to make it only set velocity to 1 in the direction, then divide the components of the vector with the length (normalization)

local vehicle = getPedOccupiedVehicle(localPlayer) 
local mx, my, mz, mpx, mpy, mpz = getCameraMatrix() 
local dist = getDistanceBetweenPoints3D(mx, my, mz, mpx, mpy, mpz) 
local vector =  
{ 
    (mx - mpx) / dist, 
    (my - mpy) / dist, 
    (mz - mpz) / dist 
} 
setElementVelocity(vehicle, -vector[1], -vector[2], -vector[3]) 

It may give better result if you use the vehicle position and camera position instead of camera position and camera target position.