Matrix multiplication order

[Valmond]

Hi all!

I'm trying to convert some DirectX code to 'Irrlich-DirectX' code and it seems the matrix multiplications are 'the other way' in them.

In the M$ example it says:

Code: Select all

Matrix mViewProj = m_mView * m_mProj;

but in Irrlicht I do: (starting with Projection and multiplies with View to get, not proj_view but view_proj...)

Code: Select all

core::matrix4 ViewProj ;
ViewProj = driver->getTransform(video::ETS_PROJECTION);
ViewProj *= driver->getTransform(video::ETS_VIEW);
 

Why is it so, is the multiplication code reversed in Irrlicht (or am I dreaming)?

[Radikalizm]

I believe DX stores matrices in column-major format while irrlicht stores them in row-major format

[hybrid]

IIRC, the *= operator uses different order. Just do it as the others do.