Tangent Space Matrix

Math and Physics Programming

Started by MButchers March 19, 2002 09:04 AM

0 comments, last by MButchers 22 years, 1 month ago

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March 19, 2002 09:04 AM

Hello all, im currently implimenting Dot3 Bump mapping in the graphics side of my engine and am having problems generating the tangent matrix,could anyone possibly point out what is wrong with the following code

  

function TangentMatrix16(T: PTexCoords2f ;N: PVector3f): TMatrix16f;
var
  t3d,b: TVector3f;
begin
  Result := NullMatrix16;
  //generate and normalize t vector from 2d texture coords

  t3d := Vector3f(T[0],T[1],0);
  Normalize(t3d);

  //generate bi normal

  CrossProd(@n,@t3d,b);
  Normalize(b);

  //populate matrix

  Result[0] := t3d[0]; Result[1] := t3d[1]; Result[2] := t3d[2];
  Result[4] := b[0]; Result[5] := b[1]; Result[6] := b[2];
  Result[8] := n[0]; Result[9] := n[1]; Result[10] := n[2];

  Result[15] := 1;
end;

Many thanks Mark