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D3DXVec3TransformCoord


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#1 Mythar   Members   -  Reputation: 138

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Posted 16 April 2000 - 08:24 AM

Hi all, dose anyone know the source for the D3DXVec3TransformCoord function ?

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#2 Andreas Jonsson   Moderators   -  Reputation: 3370

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Posted 16 April 2000 - 09:07 AM

Why do you ask?

The formula is:

In: VECTOR V, MATRIX M
Out: VECTOR V

float x,y,z,w;

x = V.x*M._11 + V.y*M._21 + V.z*M._31 + M._41;
y = V.x*M._12 + V.y*M._22 + V.z*M._32 + M._42;
z = V.x*M._13 + V.y*M._23 + V.z*M._33 + M._43;
w = V.x*M._14 + V.y*M._24 + V.z*M._34 + M._44;

V.x = x/w;
V.y = y/w;
V.z = z/w;

If you look in D3DUtil.cpp or D3DMath.cpp you can see Microsoft''s implementation. Of course they may have changed it slightly for D3DX, most likely to support Intel and AMD specific code, but the principle is the same.

WitchLord

#3 Mythar   Members   -  Reputation: 138

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Posted 16 April 2000 - 09:03 PM

Thx, for the code.
The reson I asked, is that I program in Delphi, and have to re-write the code from c++
(can''t use the c++ lib''s in Delphi)




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