Here is a few questions. [MOSTLY SOLVED]

Shaders
1
  1. If Codea Sratch pad is like the “Demo” app why is is 5 dollars? Why not make a free "Demo"ish
  2. How can i make…like for example…print(“HIT!”) when a ball hits the right side of the wall, i know how to if you are using x,y positions…But what about Physics ball?(aka a invisible ball with a color circle fallowing it around) So my ? is how do i make it react to things? i know IF tests but cant seem to get it to work :frowning:
  3. Thats it for now, THANKS FOR ANY HELP its really Apprerciated!!!
2

@EvanDavis, I don’t know about q1, but for q2 you can use the collide(contact) function, which is called every time physics objects collide (similar to touched(touch), which happens every time a touch occurs).

3

@EvanDavis Here’s a little demo showing collisions. The code will print which ball collides with an EDGE or which 2 balls collide with each other.

function setup()
    physics.continuous=true
    e1=physics.body(CHAIN,true,vec2(0,0),vec2(0,HEIGHT),
                vec2(WIDTH,HEIGHT),vec2(WIDTH,0))
    e1.info="edge"
    tab={}
    for z=1,5 do
        p=physics.body(CIRCLE,10)
        p.x=math.random(WIDTH)
        p.y=math.random(HEIGHT)
        p.restitution=1
        p.linearVelocity=vec2(200,200)
        p.info=tostring(z)
        p.gravityScale=0
        p.friction=0
        table.insert(tab,p)
    end
end

function draw()
    background(40, 40, 50)
    for a,b in pairs(tab) do
        fill(255)
        ellipse(b.x,b.y,20)
        fill(255,0,0)
        text(a,b.x,b.y)
        
    end   
end

function collide(c)
    if c.state==BEGAN then
        print(c.bodyA.info,c.bodyB.info)
    end
end
4

Perfect!! thanks dave