opengl - Create a cube with a 3d mesh, using a 2d array -

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i need create cube using mesh using these properties: "a two-dimensional array containing mesh vertices. each entry of array specifies vertices of 1 row of mesh. arrays rows must have same length. there must @ least 2 rows, , each row must have @ least 2 vertices"

if think representation of cube made of paper:

cube sample

you can see 2 meshes, 3 orizontal square , 3 vertical. in case have use 2 meshes, while need one. i'd not have overlap, , not able find solution. best option i've found consists in filling array 9 rows.

each rows contains 2 entry, , in way creating surface of cube. i'm attaching few images explain creates first rows, till when reach overlapping point:

image representation

i guess problem has no solution, in case of have idea open proposal.

(i'm sorry order may not accurate)

var row0 = [];   x, y, l x+t, y, l  var row1=[]         x, y, l+400 x+t, y, l+400  var row2=[]         x, y+t, l+400 x+t, y+t, l+400  var row3=[]        x, y+t, l x+t, y+t, l  var row4=[]          x, y, l x+t, y, l  var row5=[]       x+t, y, l x+t, y+t, l  var row6=[]          x+t, y, l+400 x+t, y+t, l+400  var row7=[]        x, y+t, l x, y, l  var row8=[] x, y+t, l+400 x, y, l+400

with "x,y" 2 random coordinates having distance of 400."t" variable. while "l+40"0 indicates distance in height "l".

source here

you're totally overthinking problem.

let's step moment: in 3d space each position specified 3 values; in cartesian coordinate system called x, y , z.

we write down row of scalar values:

x, y, z

a cube consists of 6 faces, each 1 made of 4 points, each point position shared 3 faces. let's assume cube center @ origin , width of 2, 2 faces in xy-plane be

-1, -1, -1  1, -1, -1  1,  1, -1 -1,  1, -1  1, -1,  1 -1, -1,  1 -1,  1,  1  1,  1,  1  …

there 4 more faces (two in xz , 2 in yz) make full cube. what's important (for question) is, how these values written down. numbers wrote. see? 2d array of numbers (3 numbers in row), 1 row every point cube's mesh made from. that's there is.

a mesh such list of vertices. don't think of "foldable mesh made paper". list of positions, can duplicate positions. may write down 8 positions once , use second, 1d array list of how make mesh these positions.


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