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...Rotate a 3D Point?
Autor: Arash Partow
Homepage: http://www.partow.net
[ Print tip ]  

Tip Rating (10):  
     


const
  
PIDiv180 = 0.017453292519943295769236907684886;

procedure Rotate(Rx, Ry, Rz: Double; x, y, z: Double; var Nx, Ny, Nz: Double);
var
  
TempX: Double;
  TempY: Double;
  TempZ: Double;
  SinX: Double;
  SinY: Double;
  SinZ: Double;
  CosX: Double;
  CosY: Double;
  CosZ: Double;
  XRadAng: Double;
  YRadAng: Double;
  ZRadAng: Double;
begin
  
XRadAng := Rx * PIDiv180;
  YRadAng := Ry * PIDiv180;
  ZRadAng := Rz * PIDiv180;

  SinX := Sin(XRadAng);
  SinY := Sin(YRadAng);
  SinZ := Sin(ZRadAng);

  CosX := Cos(XRadAng);
  CosY := Cos(YRadAng);
  CosZ := Cos(ZRadAng);

  Tempy := y * CosY - z * SinY;
  Tempz := y * SinY + z * CosY;
  Tempx := x * CosX - Tempz * SinX;

  Nz := x * SinX + Tempz * CosX;
  Nx := Tempx * CosZ - TempY * SinZ;
  Ny := Tempx * SinZ + TempY * CosZ;
end;
(* End Of *)

 

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