What is the right equation to calcule the needed vector velocity to send a player at?

[bran92don]

I am trying to find out the needed velocity in vector form to send a player at with only knowing the players position, target position, time, distance, and height.

I had something that seemed correct but apparently it is to weak. I tried powering it and it said that it was to fast in console so it would not apply the velocity.

Code:
[lua]
function CalculatePlyrArc(ply)
local vec1 = ply:GetPos() //Get Player vector position
local vec2 = Vector(0,0,0) //Target Position
local grav = ply:GetGravity()*9.81 //Gravity
local ang = 45 //Angle
local Hgt = math.abs( vec1.z-vec2.z) //Height
local dis = vec1:Distance( vec2 ) //Distance between vectors
local t = 5 //Time it takes
local velx = 0
local vely = 0

//vel = (math.sqrt(grav) * math.sqrt(vec2.x) * math.sqrt((math.tan(ang)*math.tan(ang))+1)) / math.sqrt(2 * math.tan(ang) - (2 * grav * vec2.y) / vec2.x);
velx = math.pow((vec2.x-vec1.x)/t, 2)
vely = math.pow((vec2.y+.5*grav*t*t-vec1.y)/t, 1)
ply:SetVelocity( Vector(0,vely,velx))
end
[/lua]

[thegrb93]

Pretty sure your gravity is wrong. Your equation looks pretty wrong too. [url]https://en.wikipedia.org/wiki/Projectile_motion#The_initial_velocity[/url]

target = vec2-vec1
Vel = Vector( target.x / t, target.y / t, target.z / t + gravity * t / 2 )

[c👌de_g🎷]

GetGravity returns a gravity multiplier. Use this against sv_gravity to get the gravity for the player. Also, 9.81 is assuming you're in metres, which you should never do in a game engine.

[editline]8th July 2015[/editline]

Ninja'd

[bran92don]

[QUOTE=code_gs;48154029]GetGravity returns a gravity multiplier. Use this against sv_gravity to get the gravity for the player. Also, 9.81 is assuming you're in metres, which you should never do in a game engine.

[editline]8th July 2015[/editline]

Ninja'd[/QUOTE]

[QUOTE=thegrb93;48154016]Pretty sure your gravity is wrong. Your equation looks pretty wrong too. [url]https://en.wikipedia.org/wiki/Projectile_motion#The_initial_velocity[/url]

target = vec2-vec1
Vel = Vector( target.x / t, target.y / t, target.z / t + gravity * t / 2 )[/QUOTE]

Thanks I was over-thinking it. I was trying to add in all this unneeded information.