Draw texture on the X,Y of 3D object

[julionib]

anyone know if there is an method to, based on an 3D object (vehicle for example), draw one texture in the 2D screen position?

 

i have an plane in front of the player, i wanna draw an texture (e.graphics.drawSprite) in the position of that object on the screen, like an target identifier system

[AgentWD40]

i might have a solution, check your inbox

Edited January 12, 2013 by hardsty1e

[julionib]

thx man

[lindsayslorach]

Might we be able to know hardsty1e's suggestion/solution?

[AgentWD40]

you can learn off julionib's Air Combat IV mod that he just released open source

 

http://www.gta4-mods.com/script/air-combat-iv-v10-f19199

Edited January 16, 2013 by hardsty1e

[julionib]

 

Might we be able to know hardsty1e's suggestion/solution?

hehe, sorry

 

unfortunatelly i cant find a good way to establish and distance proportion calc to make this fit exactly where thee object is, the Y value works fine, but the X dont, using the idea to find the Y we can do the same to the X value, using distancet between object and camera and calculating the X variation, the problem its determine when the camera its on the left/right of the object to decide if the X offset its negative or not

 

this is the code:

 

 

if jetList©.jet.isonscreen andalso (jetList©.jet.position.distanceto(myJet.position) > 350) then     dim float_temp_1 as double     dim TO_RADIAN = 0.017453292519943295     float_temp_1 = Math.Atan2((jetList©.jet.Position.Y - Player.Character.Position.Y) , (jetList©.jet.Position.X - Player.Character.Position.X))     float_temp_1 = float_temp_1 - Game.CurrentCamera.Rotation.Z * TO_RADIAN     float_temp_1 += 1.570796          dim cam as camera = game.currentcamera     dim dist as double = jetList©.jet.position.distanceto(cam.position)     dim compPos as vector3 = (cam.position + cam.direction * dist)     dim y as double = (((compPos - jetList©.jet.position).z)) / dist          if jetList©.is_hunter then     	GTA.Native.Function.Call("DRAW_RECT", 0.5f + 0.6f * (Math.Sin(float_temp_1)), y + 0.55, 0.01, 0.02, 255, 0, 0, 100)     elseif jetList©.is_fugitive then     	GTA.Native.Function.Call("DRAW_RECT", 0.5f + 0.6f * (Math.Sin(float_temp_1)), y + 0.55, 0.01, 0.02, 200, 200, 0, 100)      	     else     	GTA.Native.Function.Call("DRAW_RECT", 0.5f + 0.6f * (Math.Sin(float_temp_1)), y + 0.55, 0.01, 0.02, 100, 100, 100, 100)     end if   	end if

 

[julionib]

obs: i used this to identify the enemy jets when they dont appear in the screen (thx to game limitation ^^)

 

the inital idea was use it as an missile lock draw on the enemy jet