Quote:Original post by stringa
The 3x3 Matrix is the "Vector Space" transform of the basis vectors...

Your correct that you do not get any translational data, and you loose the ability to move anywhere...

Quote:Original post by stringa
Try your D3DX Libraries for helper functions.

As long as you leave out the 4th row and 4th column, you should have your 3 basis vectors.

The graphics pipe doesn't know the difference between 2D and 3D. It's just how you define your projection matrix and do the math that follows. Helper functions abstract math from the programmer. 2D help functions use 3x3 matricies with the 3rd column as the Translational Transform.

Quote:Original post by stringa
I'm totally confused.

It seems as you don't want to do 100 % of the math.

If you using Visual Studio, type in 'D3DX' in some scope of the program and push "Alt" + "Right" to get a list of all the helper functions. I think "CTRL" + "SPACE" works too. If you use D3DXMatrixTransformation, you can do whatever you want in a single function call.

Enjoy...

	for (int i=32;i>0;i--) // 32 == iterations	{		set_transformations();		// extract the position of the homogeenous matrix		//const D3DXVECTOR3& position = rootframe->TransformationMatrix		D3DXVECTOR3 position(rootframe->TransformationMatrix._41, rootframe->TransformationMatrix._42, rootframe->TransformationMatrix._43);	}

// set_transformation();D3DXMATRIX& parenttransf = Currframe->parent->TransformationMatrix;		D3DXMATRIX& childtransf = Currframe->TransformationMatrix;		childtransf = parenttransf * childtransf;

Quote:Original post by MJP
For D3D, the translation portion of the matrix is contained in the _41, _42, and _43 members of the D3DXMATRIX class. Just pull those out and you're good to go. IIRC, all D3DXMATRIX objects initialize themselves to identity. If they don't, just call D3DXMatrixIdentity to set one. After that, you can set the 3x3 portion of the matrix to whatever you want.

D3DXMATRIX rotation;D3DXMatrixIdentity(&rotation);rotation._11 = rootframe->TransformationMatrix._11;rotation._12 = rootframe->TransformationMatrix._12;rotation._13 = rootframe->TransformationMatrix._13;rotation._21 = rootframe->TransformationMatrix._21;rotation._22 = rootframe->TransformationMatrix._22;rotation._23 = rootframe->TransformationMatrix._23;rotation._31 = rootframe->TransformationMatrix._31;rotation._32 = rootframe->TransformationMatrix._32;rotation._33 = rootframe->TransformationMatrix._33;