ToScreen() in E2 ~ Possible?

[lollybobi]

Well, I already thought about something like toScreen()...
But I didn't know how the ToScreen() in the lua actuelly works, and how it does calculate it

All it does is:
It takes an vector and outputs an vec2, which is the possition on the screen

[CmdrMatthew]

//Turns the World vec3 into the Screen vec2
local screenPos = Vector( WorldxPos, WorldyPos, WorldzPos ):ToScreen()
//Sets a variable for the x screen coordinate
ScreenxPos = screenPos.x
//Sets a variable for the y screen coordinate
ScreenyPos = screenPos.y

or just

//Turns a world vector directly into a screen vector
local screenPos = WorldPos:ToScreen()

There's some example LUA that you could use for it. It has to be run on the client for it to work. If you want, I could write a E2 addon for it.

Edit: Nevermind. I misread Lolly's post.

[Colonel Thirty Two]

-snip-
EDIT: Crap, thought you were talking about in-game screens, like the Digital screen, GPU, EGP, ect.

[Divran]

EGP already has this.

No it doesn't

[Drunkie]

This sounds like it would be interesting to have. I wonder what algorithm ToScreen() in Lua uses to calculate the vector.

[Solece]

It's a clientside function, meaning if you were to call the toScreen() func in e2, the server has to send a request for it to the client, then the client has to send the vector2 back to the server, then e2 has to return it. This might become very resource intensive when being used every tick.

[Dav1d]

Well it would have little to no use on the server anyway.
If it's E2 HUD functions you're interested in, someone already made them, just search around a bit.
Personally I'd just wait for HUD2 to be finished, as that's run clientside, meaning there is little network traffic after the HUD2 script is sent.

But yes, it is possible, if not useless.

[Colonel Thirty Two]

I wonder what algorithm ToScreen() in Lua uses to calculate the vector.

Well, same algorithm for plotting 3D vertices on a 2d plane (the screen). Not too sure exactly how to do that though.

[viperfan7]

I have a bit of code I tried to do this with, although it never did work properly, but here it is if someone could use it some how

@name 3D Projection
@inputs CamPos:vector CamAng:angle WorldPos:vector 
@outputs ScreenPos:vector2 ViewerPos:vector
@persist FoV 
@persist [Screen]:vector2
@persist [ViewerPos ModPos]:vector
@persist [CPM CYM CRM]:matrix
@persist [FM]:matrix4 [PFV FV]:vector4
@trigger 

runOnTick(1)

if(first())
{
    FoV = 75 #Replace with your Field of View
    Screen = vec2(1280,960) #Replace with your resolution
    ViewerPos = vec(Screen/2,Screen:x()/(2*tan(FoV/2)))
}

CPM = matrix(
            vec(1,          0        ,          0         ),
            vec(0,cos(CamAng:pitch()),-sin(CamAng:pitch())),
            vec(0,sin(CamAng:pitch()),cos(CamAng:pitch()))
            )
            
CYM = matrix(
            vec(cos(CamAng:yaw()),0,sin(CamAng:yaw())),
            vec(0,1,0),
            vec(-sin(CamAng:yaw()),0,cos(CamAng:yaw()))
            )

CRM = matrix(
            vec(cos(CamAng:roll()),-sin(CamAng:roll()),0),
            vec(sin(CamAng:roll()), cos(CamAng:roll()),0),
            vec(        0         ,         0         ,1)
            )
            
ModPos = (CPM*CYM*CRM)*(WorldPos-CamPos)

PFV = vec4(ModPos,1)

FM = matrix4(
            vec4(1,0,0,-ViewerPos:x()),
            vec4(0,1,0,-ViewerPos:y()),
            vec4(0,0,1,0),
            vec4(0,0,1/ViewerPos:z(),0)
            )
            
FV = FM*PFV

ScreenPos = vec2(FV:x()/FV:w(),FV:y()/FV:w())*Screen:x()

using the math on wikipedia's page on 3D projection

also, the math for both 3x3 matrices and 4x4 is there, its right now using the 4x4


if someone gets it to work please send me the code