old/PAS/RayTracing/TGA2.PAS

Uses UVector, ObjTrace, Gtypes,Objects, Dos;
CONST
  CANJITTER = [F_OBJ_SPHERE,F_TRI_PLANE];
  IfJitter  = TRUE;
  JitterConst = 0.05;
  TGAHeader : array [1..12] of byte = (0,0,2, 0,0,0, 0,0,0, 0,0,0);
  MAXRecur  = 5;

type

  PTGATrace = ^TGATrace;
  TGATrace = object (TTracer)
    outF   : FILE;
    ver    : longint;
    Constructor Init(OutPut : string);
    Procedure GetReflPointColor(var aC:RGB;aRay:TRay;Num:word);
    {
      Работают отражения !!!!
      Num - текущая глубина рекурсии (для первого запуска - 1)
    }
    Procedure Trace(ResX,ResY:word);
    Destructor Done;virtual;
  end;
{TGATrace}
    Constructor TGATrace.Init(OutPut : string);
    var res:word;
    begin
      Inherited Init;
      Ver := CurVer;
      Assign(outF,OutPut);
      Rewrite(outF,1);
      BlockWrite(outF,TGAHeader,12,Res);
      if Res <> 12 then
       begin
         WriteLn('Writing to ',OutPut,' error!');
         Halt(255);
       end;
    end;
{-------------------------}
    Procedure   TGATrace.GetReflPointColor(var aC:RGB;aRay:TRay;Num:word);
    var
      Lt : POmni;
      Ob : PSurfObj;
      N,P,R : tVec;
      ReflCol,oC : RGB;
      L,Refl : TRay;
      Pd,tmp : float;
      i  : word;
    begin
      SetColor(aC,0,0,0);
      if Num >= MAXRecur then Exit;
      oB := PSurfObj(FindISect(aRay,Pd));
      if oB = nil then exit;

      aC := Ambient;
      aRay.GetPoint(P,Pd);
      oB^.GetNormal(N,P);
{NEW 25.06.01}
{Added jitter feature}
      if IfJitter and (oB^.ID in CanJitter) then
      begin
       VRandomize(N,JitterConst);
       VNorm(N,1);
      end;

      for i := 1 to LightCount do
        if Pos('OMNI',Lights^[i]^.OType) <> 0 then
        begin
          Lt := POmni(Lights^[i]);
          L.Init(P,P);
          VLinear(L.Dir,Lt^.Pos,P,1,-1);
          if (FindISect(L,tmp) = nil) or (tmp>1.0)  then
          begin
	    tmp := Vcos(N,L.Dir) * oB^.Surface^.Kd
{New 2 Prev}    / VDot(L.Dir,L.Dir); {Делим на квадрат расстояния
		    				до источника}
            CAddMul(aC,Lt^.Color,tmp);

            VLinear(R,N,L.Dir,-2*VDot(N,L.Dir),1);
            tmp := Pow(VCos(R,aRay.Dir),Ob^.Surface^.Ns)*Ob^.Surface^.Ks
{New}            	   / VDot(L.Dir,L.Dir); {Делим на квадрат расстояния
		    				до источника}
            CAddMul(aC,Lt^.Color,tmp);
          end;
 	end;
{Calculate Reflection vec}
      Refl.Init(P,P);
      VLinear(Refl.Dir,N,aRay.Dir,-2*VDot(N,aRay.Dir),1);
      GetReflPointColor(ReflCol,Refl,Num+1);
      CAddMul(aC,ReflCol,Ob^.Surface^.Ks);
{      CAddMul(aC,ReflCol,1);}

      Ob^.GetColor(oC,P);

      aC.R := aC.R * OC.R;
      aC.G := aC.G * OC.G;
      aC.B := aC.B * OC.B;
    end;{TGATrace.GetPointColor}
{-------------------------}
    Procedure   TGATrace.Trace;
    var
     Ray    : tRay;
     i,j    : longint;
     ColP   : LongInt;
     DX,DY  : tVec;
     C      : tVec;
     T,cur  : float;
     Col    : RGB;
    begin
     FillChar(Ray.Org,vecsize,0);
     FillChar(Ray.Dir,vecsize,0);
     FillChar(DX,vecsize,0);
     FillChar(DY,vecsize,0);

     BlockWrite(outF,ResX,2);
     BlockWrite(outF,ResY,2);
     i:=24;
     BlockWrite(outF,i,2);

     C := View.LLPos;
     VLinear(DX,View.Right,View.Right,1/ResX,0); {Расчет вектора прироста по X & Y}
     VLinear(DY,View.Up,   View.Right,1/ResY,0); {}

     for i := ResY-1 downto 0 do
     begin
       for j:= 0 to ResX-1 do
       begin
         Ray.Init(View.CamPos,View.CamPos);
         VLinear(Ray.Dir,C,View.CamPos,1,-1);
         VNorm(Ray.Dir,1);
         GetReflPointColor(Col,Ray,1);  {Try This Stuff (It's work!)}
         ColP:=Pack24(Col);
         BlockWrite(outF,ColP,3);
         VLinear(C,C,DX,1,1);
       end;
       VLinear(C,C,DX,1,-ResX);
       VLinear(C,C,DY,1,1);
       Write(#13'Line: ',ResY-i,'/',ResY,'  ');
     end;
    end;{TGATrace.Trace}
{-------------------------}
  Destructor TGATrace.Done;
  begin
    Close(outF);
    Inherited Done;
  end;
{-------------------------}

Var
  TGA : TGATrace;
begin
  randomize;
  TGA.Init('ballpln.tga');
  TGA.Load('ballpln.tra');
{
  New(aTex,Init(54,64));
  aTex^.LoadTGA('Rod.tga');

  PTriangle(TGA.Objects^[2])^.SetTexture(aTex,1/5,1/5);}

{  VSet(v1,-40,100,-130);
  VSet(v2,0,-10,0);
  TGA.SetCamera(v1,v2,0,50,1);

  VSet(v1,0,-30,0);
  VSet(v2,5,-30,0);
  VSet(v3,0,-30,5);
  aC.R:=0.3;aC.G:=0.4;aC.B:=1;
  New(PTri,Init(v1,v2,v3,aC));
  PTri^.SetSurf(0.6,0.9,1);
  TGA.AddObject(PTri);

  aC.R:=7000;aC.G:=10000;aC.B:=7000;
  New(m_gOmni,Init(30,100,-70,aC));
  TGA.AddLight(m_gOmni);

  TGA.Save('new.tra',true);

{
  VSet(v1,-100,2,0);
  VSet(v2,100,20,0);
  VSet(v3,0,100,50);
  aC.R:=0.3;aC.G:=0.4;aC.B:=1;
  New(PTri,Init(v1,v2,v3,aC));
  PTri^.SetSurf(0.6,0.5,1);
  TGA.AddObject(PTri);
 }

  TGA.Trace(500,500);
  Writeln;
  TGA.Done;
{  TGA.Load('cool.tra');}

{  TGA.Load('planes.tra');}

{  TGA.Save('cool.tra',true);}

end.