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unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls;

type TVector = packed record
        x,y,z: single;
end;

function vector3f(Px,py,pz: single): TVector;
function vectostr(V: tVector): string;

type
  TForm1 = class(TForm)
    Button1: TButton;
    ListBox1: TListBox;
    Button2: TButton;
    procedure Button1Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

type PVector = ^Tvector;

var
  Form1: TForm1;
  vertexarray: Array of tvector;
  PointerArray: array of PVector;
implementation

{$R *.dfm}

function vector3f(Px,py,pz: single): TVector;
begin

result.x := PX;
result.y := PY;
result.z := PZ;
end;

function vectostr(V: tVector): string;
begin

result := 'x: ' + floattostrf(V.x,fffixed,10,2);
result := result+ '  y: ' + floattostrf(V.y,fffixed,10,2);
result := result+ '  z: ' + floattostrf(V.z,fffixed,10,2);
end;

procedure TForm1.Button1Click(Sender: TObject);
var i,j: integer;
begin

setlength(Vertexarray,length(VertexArray)+3);
Setlength(PointerArray,length(PointerArray)+3);

VertexArray[high(vertexarray)-2] := vector3f(4,4,4);
VertexArray[high(vertexarray)-1] := vector3f(5,5,5);
VertexArray[high(vertexarray)]   := vector3f(6,6,6);

PointerArray[high(PointerArray)-2] := @Vertexarray[High(Vertexarray)-2];
PointerArray[high(PointerArray)-1] := @Vertexarray[High(Vertexarray)-1];
PointerArray[high(PointerArray)] := @Vertexarray[High(Vertexarray)];

j:=1;
for i:=0 to high(Pointerarray) do
        begin
                Listbox1.items.add(vectostr(Pointerarray[i]^));
                if j mod 3 = 0 then listbox1.Items.Add('');
                inc(j);
        end;

end;

end.					

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type TTriangle = packed record
           Vertices: array[0..2] of PVector;
           ...
end;

type T3DObject = class

        TriangleArray: array of TTriangle;
        VertexArray: Array of TVector; 
        ...
end;