Noob 2D Movement Question?

[Guinner]

Hey, just went to create a thread and saw that this was still active so:
My problem is I added two Billboards on either side of the character (So it doesn't fall off the screen.) I also changed mass, bounce, friction and movement of the character to stop it from bouncing everywhere and to slow the movement. But the character is no longer jumping :c I have the following code:

Char_AI

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function char_AI.onJump ( )
--------------------------------------------------------------------------------
local height = 20 --change this to a number that suits you
local x,y,z = object.getTranslation (this.getObject(), object.kGlobalSpace) --get object coordinates in global space
local hHitObject, nHitDist, nHitSurfaceID = scene.getFirstHitCollider ( application.getCurrentUserScene(), x, y, z, 0, -1, 0, height )

local upforce = 75 --change to a number that suits you
if not hHitObject then
    dynamics.addLinearImpulse ( this.getObject(), 0, upforce, 0, object.kLocalSpace )
end
   
--------------------------------------------------------------------------------
end

Under MainAI.onKeyboardDown

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else if kKeyCode == input.kKeyW then
    object.sendEvent (hPlayer, "char_AI", "onJump") --1 forward, 0 stand still, -1 backward
end

There's no errors, but it's not jumping either :/

[broozar]

what do you mean by billboads? please provide a small screenshot/video/STE archive. something might be intersecting with the player dynamics sphere body, or you set the damping too high, or the trace constantly... on second thought, why is there a "not" in front of hHitObject.

the idea of the trace: it scans the area under the player's feet. so if there is NOT an object hit by the ray, it should NOT jump, but if there IS an object, it SHOULD jump. height should be small (like 0.3 instead of your 20 meters). try removing the "not".

[Rotundjere2]

thanks, this is working now..

probably because I put the model to close with plane/ground (the model make collision with ground first and then jumping to high)

[Guinner]

I don't have very good internet so uploading anything takes forever, sorry.
I took out the 'not' to no avail.
The setup is as follows:
Camera< Wall Character Wall
So the camera is looking in that direction -> There is an invisible wall, then the character which is just standing on a square, there is then another invisible wall just behind this square. This stopped the character from falling off, bouncing erratically and just makes it the 2D movement, (Unless there's a better way?)
Character left and right movement still works but there is no jump? I'd really appreciate the help, you guys really are amazing!

[Rotundjere2]

I don't have very good internet so uploading anything takes forever, sorry.
I took out the 'not' to no avail.
The setup is as follows:
Camera< Wall Character Wall
So the camera is looking in that direction -> There is an invisible wall, then the character which is just standing on a square, there is then another invisible wall just behind this square. This stopped the character from falling off, bouncing erratically and just makes it the 2D movement, (Unless there's a better way?)
Character left and right movement still works but there is no jump? I'd really appreciate the help, you guys really are amazing!

This code is working very well

Code: Select all

--------------------------------------------------------------------------------
function char_AI.onJump ( )
--------------------------------------------------------------------------------
local height = 0.3 --change this to a number that suits you
local x,y,z = object.getTranslation (this.getObject(), object.kGlobalSpace) --get object coordinates in global space
local hHitObject, nHitDist, nHitSurfaceID = scene.getFirstHitCollider ( application.getCurrentUserScene(), x, y, z, 0, -1, 0, height )

local upforce = 50 --change to a number that suits you
if (this.jumping() == true) and hHitObject then
    dynamics.addLinearImpulse ( this.getObject(), 0, upforce, 0, object.kLocalSpace )
    this.jumping(false)
end
   
--------------------------------------------------------------------------------
end
--------------------------------------------------------------------------------

[Guinner]

This code is working very well

Code: Select all

--------------------------------------------------------------------------------
function char_AI.onJump ( )
--------------------------------------------------------------------------------
local height = 0.3 --change this to a number that suits you
local x,y,z = object.getTranslation (this.getObject(), object.kGlobalSpace) --get object coordinates in global space
local hHitObject, nHitDist, nHitSurfaceID = scene.getFirstHitCollider ( application.getCurrentUserScene(), x, y, z, 0, -1, 0, height )

local upforce = 50 --change to a number that suits you
if (this.jumping() == true) and hHitObject then
    dynamics.addLinearImpulse ( this.getObject(), 0, upforce, 0, object.kLocalSpace )
    this.jumping(false)
end
   
--------------------------------------------------------------------------------
end
--------------------------------------------------------------------------------

I'm sorry, but how do you declare this under the keyboardpress? Under main_AI. I feel so silly asking so many questions!

[broozar]

you don't. this is the onJump handler for your char AI.

to declare a member variable like this.jumping(), go to the AI Model Module (the one with the brain), open your char_AI, then click the "+" under variables and call it "jumping" and set it to boolean, initial value "false".

[Guinner]

Ahh, I phrased my questions very badly. What I meant was how do I say 'When W is pressed, make jumping true.' Like this, although this one doesn't work:

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else if kKeyCode == input.kKeyW then
    object.sendEvent (hPlayer, "char_AI", "onJump", true)

[broozar]

like so:

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if kKeyCode == input.kKeyW then
    object.setAIVariable ( hChar, "char_AI", "jumping", true )
    object.sendEvent (hPlayer, "char_AI", "onJump" )
end

[Guinner]

Main_AI_Handler_onKeyboardKeyDown.lua:16: undeclared variable : hChar
Now I tried fixing this myself :c Everything from adding it as a objectvariable on main_AI and Char_AI to declaring it as a local variable the same what we did hPlayer. But I just can't figure out where it goes.
Sorry, could I get some help on this one again?

[broozar]

oh well. i guess it's just easier if i made a small sample game... give me 20 minutes

[Guinner]

Thanks heaps man, sorry to ask so much.
If it's too much trouble then please dont. But if so, it'd be awesome to see how the proper 2D is done.

[broozar]

quick update: i have movement working, however, addLinearImpulse produces rather unnatural results. let me tinker with it a little longer, to get "proper" movement.

[Guinner]

I'll be waiting in anticipation!

[broozar]

ok, sorry. took me longer than i expected, not the coding, but making the movement feel natural - whatever that means in a 2d world where characters are supposed to be able to jump 5 times their own height.

youtube video of how it is supposed to look: http://youtu.be/i-71R-AuOgk

the project STE: http://caffier.net/demo2d.ste