whats new ¦  programming tips ¦  indy articles ¦  intraweb articles ¦  informations ¦  links ¦  interviews
 misc ¦  tutorials ¦  Add&Win Game

Tips (1548)

Database (90)
Files (137)
Forms (107)
Graphic (116)
IDE (21)
Indy (5)
Internet / LAN (131)
IntraWeb (0)
Math (76)
Misc (127)
Multimedia (45)
Objects/
ActiveX (51)

OpenTools API (3)
Printing (35)
Strings (83)
System (268)
VCL (243)

Top15

Tips sort by
component


Search Tip

Add new Tip

Add&Win Game

Advertising

38 Visitors Online


 
...Signed Volume in 3D?
Autor: Arash Partow
Homepage: http://www.partow.net
[ Print tip ]  

Tip Rating (8):  
     


function Signed(x1, y1, z1, x2, y2, z2, x3, y3, z3, Px, Py, Pz: Double): Double;
var  
  
Px1, Px2, Px3: Double;
  Py1, Py2, Py3: Double;
  Pz1, Pz2, Pz3: Double;
begin
  
Px1 := x1 - px;
  Px2 := x2 - px;
  Px3 := x3 - px;

  Py1 := y1 - py;
  Py2 := y2 - py;
  Py3 := y3 - py;

  Pz1 := z1 - pz;
  Pz2 := z2 - pz;
  Pz3 := z3 - pz;

  Result := Px1 * (Py2 * Pz3 - Pz2 * Py3) +
    Px2 * (Py3 * Pz1 - Pz3 * Py1) +
    Px3 * (Py1 * Pz2 - Pz1 * Py2);
end;
(* End Of Signed *)


 

Rate this tip:

poor
very good


Copyright © by SwissDelphiCenter.ch
All trademarks are the sole property of their respective owners