Blending matrices

[Paulius]

Only the last row defines position, lineary interpolating w components makes no sense

[JSoftware]

scaling?

[User137]

Well, it is not just interpolating w components but resetting those values to the matrix. QuaternionToMatrix3 only touches first 3x3 part. If i replace 0..3 to 0..2 it doesn't work, either copying only other i or j row doesn't work. Must have the full matrix initialized.

This will get cleaner when i edit those functions using pointers instead of slowly taking and returning full matrixes and vectors.

[LP]

This will get cleaner when i edit those functions using pointers instead of slowly taking and returning full matrixes and vectors.

You can do that, but you lose elegancy *and* usability. You won't be able to do something like that:

 // Delphi 2005 or lower code
 RawMtx:= MatMul(MatScale(Vector3(0.5, 0.5, 0.5)), MatMul(MatTransl(Vector3(100.0, 50.0, 0.0)), MatRotateX(Pi / 2)));

 // Delphi 2006
 RawMtx:= Vector3(0.5, 0.5, 0.5) * (MatTransl(Vector3(100.0, 50.0, 0.0)) * MatRotateX(Pi / 2));

The only real optimization you can do is replacing return values by pointers, but as I said, you won't be able to use functions as parameters to other functions. You won't be able to optimize parameters much, since they are already passed as pointers (notice "const" in declaration).

[XProger]

Lifepower,
Delphi 2005-2006 have inline functions :)

[User137]

I don't mind usability as long as it needs short code and is faster.

This may be final version:
[pascal]procedure MatrixBlend(dest,m1,m2: PMatrix; s: single);
var q,q1,q2: TVector4; i: integer;
begin
// Initialize matrix
for i:=0 to 3 do dest[i,3]:=m1[i,3];
// Interpolate rotation
MatrixToQuat(m1,@q1);
MatrixToQuat(m2,@q2);
QuatSlerp(@q1,@q2,@q,s);
QuatToMatrix(@q,dest);
for i:=0 to 2 do // Interpolate position
dest[3,i]:=m1[3,i]+s*(m2[3,i]-m1[3,i]);
end;[/pascal]

[LP]

Lifepower,
Delphi 2005-2006 have inline functions

I know.

By the way, I've done some tests with Delphi inline functions and most of the time performance was actually dropping when using inline functions. Also, I'm not quite fond of the code generation when it comes to inline functions (somehow inline code is treated as separate in code optimization). They should have implemented macro support instead.