I may have found a bug

GR00G0

First of all. I am using the latest Beta. I used this code here to generate a sphere(for a planet), and always scale the surface 100 meters away. With my distance and radius parameter, i control the distance and parameter. This all works when I am decreasing the distance or increasing the radius, but as if i come closer and go further again it stays the same. I am sure I did everything correctly. Here is the code:

function setup()
    s = sphere(600000)
    parameter.number("d",601000,800000,800000)
    parameter.number("r",500000,600000,500000)


end


function draw()
    scl = (d-r)/100
    perspective(90)
    camera(0,d/scl,0,0,0,0,0,0,1)
    scale(r/scl)
    s:draw()


end

function sphere(radius)
    s = mesh()
    vertices = {}
    for x = -180, 175, 5 do
        for y = -90, 85, 5 do
            table.insert(vertices,sphereRotate(x,y)*radius/600000)
            table.insert(vertices,sphereRotate(x+5,y)*radius/600000)
            table.insert(vertices,sphereRotate(x+5,y+5)*radius/600000)
            table.insert(vertices,sphereRotate(x,y)*radius/600000)
            table.insert(vertices,sphereRotate(x+5,y+5)*radius/600000)
            table.insert(vertices,sphereRotate(x,y+5)*radius/600000)
        end
    end
    s.vertices = vertices
    s:setColors(color(0,0,255,255))
    return s
end

function rotate3D(vec,angle,x,y,z)
    x = x or 0
    y = y or 0
    z = z or 1

    local a,s,c = math.rad(angle),math.sin,math.cos

    if x == 1 then
        return vec3(vec.x,vec.y*c(a)-vec.z*s(a),vec.y*s(a)+vec.z*c(a))
    elseif y == 1 then
        return vec3(vec.z*c(a)-vec.x*s(a),vec.y,vec.z*c(a)-vec.x*s(a))
    elseif z == 1 then
        return vec3(vec.x*c(a)-vec.y*s(a),vec.x*s(a)+vec.y*c(a),vec.z)
    end
    return vec
end

function sphereRotate(x,y)
    return rotate3D(rotate3D(vec3(0,1,0),y,1,0,0),x,0,0,1)
end

Attila717

@GR00G0 Please post bugs and comments on the beta in the beta thread. https://codea.io/talk/discussion/8298/codea-craft-2-5-74-75-76-beta#latest
Also, please reformat your code so that you have three ~ before and after your code.

GR00G0

@Attila717 Since I didnt use the Craft extension for this example i didnt post it there, also I did put 3 "~" at the beginning and at the end. I dont know what Iam doing wrong
Also I cant even change it for some reason. Wether or not I have the 3 ~ there it always highlights that part.

Attila717

@GR00G0 I don't understand why you are trying to use meshes to create your planets, as Codea Craft would be much simpler. Is there a limitation of Codea Craft that makes it not worth using in this instance?

dave1707

@GR00G0 The 3~'s have to be on a line by themselves. You had them as ~~~function setup and end~~~ .

GR00G0

@Attila717 I want to use a similar approach like KSP. There the ground gets generated up until about 40 km. And after that a 1:6000 scale module of Kerbin gets used. Meaning that the planet is about 6 km away. If I have a rocket wich is only 10 meters lomg it will point inside the sphere. Also I feel really unconfortable of how codea craft works.

Attila717

@GR00G0 Example of how easy this is to do with Codea Craft:

-- Use this function to perform your initial setup
function setup()
    sphere(5)
    parameter.number("distance",10,20,10)
    parameter.number("radius",1,10,5, sphere)
end

function draw()
end

function update()
    craft.scene.camera.position = vec3(0,0,distance)
    craft.scene.camera.rotation = quat.eulerAngles(0,0,180)

    s.rotation = quat.eulerAngles(45 * ElapsedTime, 45 * ElapsedTime, 45 * ElapsedTime)
end

function sphere(radius)
    if s then
        s:destroy()
    end
    s = craft.entity()
    --sphereMesh can be this or an obj file like this --> craft.mesh(PUT FILE HERE)
    sphereMesh = craft.mesh.icoSphere(radius,3,false)
    sphereRender = s:add(craft.renderer, sphereMesh)
    sphereRender.material = craft.material("Materials:Standard")
    return s
end

GR00G0

@dave1707 Ah ok. Thank you. I am sorry again everyone I am new here.

GR00G0

@Attila717 Its just with the lack of documentation, things are way simpler for me using normal meshes.

dave1707

@GR00G0 You forgot background(0) at the start of the draw() function. That's the reason your circle gets bigger but not smaller. You're not clearing the previous drawings.

Here's a sphere program I have.

supportedOrientations(LANDSCAPE_ANY)

function setup()
    parameter.number("view",1,10,3)
    parameter.integer("level",6,200,12)
    parameter.action("new sphere",setup1)
    parameter.number("AngleX",0,360,90)
    parameter.number("AngleY",0,360,140) 
    parameter.number("AngleZ",0,360,90)
    setup1()
end

function setup1()    
    tab={}  -- table of points
    r=10    -- radius of sphere
    M=level
    N=level
    for n=0,N do
        tab[n]={}
        for m=0,M do
            -- calculate the x,y,z point position
            x=r * math.sin(math.pi * m/M) * math.cos(2*math.pi * n/N)
            y=r * math.sin(math.pi * m/M) * math.sin(2*math.pi * n/N)
            z=r * math.cos(math.pi * m/M)
            -- 2 dimension table of sphere points
            tab[n][m]=vec3(x,y,z)
        end
    end
    sph={}
    for n=0,N-1 do
        for m=0,M-1 do
            -- loop thru sphere table to create a rectangle
            -- create 2 triangles from 4 points of a rectangle
            -- create 1st triangle of the rectangle
            table.insert(sph,tab[n][m])
            table.insert(sph,tab[n][m+1])
            table.insert(sph,tab[n+1][m+1])  
            -- create 2nd triangle of a rectangle        
            table.insert(sph,tab[n][m])
            table.insert(sph,tab[n+1][m])
            table.insert(sph,tab[n+1][m+1])
        end
    end
    -- create table of random colors for each triangle
    cols={}
    for z=1,#sph,6 do
        col=vec4(math.random(),math.random(),math.random(),1)
        for q=1,6 do
            table.insert(cols,col)
        end
    end
    -- create mesh
    sphere=mesh()
    sphere.vertices=sph
    sphere.colors=cols      
end

function draw()  
    background(40, 40, 50)
    perspective(view,WIDTH/HEIGHT)
    camera(2000,0,0,0,0,0,0,1,0)
    rotate(AngleX,1,0,0)
    rotate(AngleY,0,1,0)
    rotate(AngleZ,0,0,1)
    sphere:draw()
end

GR00G0

Thank you @dave1707 ! Also do you know how I can draw a 3d mesh over the sphere?

dave1707

@GR00G0 How much do you know about putting an image onto a mesh. I don't want to be to basic if you know some stuff already, or I don't want to get to involved if you don't know too much.

EDIT: Instead of my explaining it, here's a link that will give you a better explanation.

https://codea.io/talk/discussion/1244/mesh-tutorial

GR00G0

@dave1707 i know how to map textures onto a sphere, but what I want to know is if I have a sphere, with the the surface about 1 meter away, and another mesh wich is bigger than 1 m, how I can draw the bigger mesh in front of the other mesh. i need this so I can scale down the planet by alot.

Attila717

@GR00G0 So what I'm hearing is that you want the sphere that makes up the solid body of the planet behind some other mesh (with an image texture) that encases the aforementioned sphere?

GR00G0

@Attila717 This is just something thats gonna happen when I scale the planet down.
Scalimg down the radius also means scaling down the distance. the actual mesh could just be a few meters away. and having a rocket in front of you would collide it with the planet(or it would just be inside it).