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Translation along the same dir as you're facing

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I''m doing something like this to move a plane mesh around my world. But something''s not right, the translation part is not working at all. The rotation part works just fine so how do i get the mesh to move in the same direction it''s facing. D3DXVECTOR3 vTrans = mesh.vVelocity * mesh.fSpeed; D3DXVec3TransformNormal( &vTrans, &vTrans, &mesh.matLocal); mesh.vPosition += vTrans; D3DXQUATERNION qR; D3DXQuaternionRotationYawPitchRoll( &qR, mesh.fYaw, mesh.fPitch, mesh.fRoll); D3DXMatrixAffineTransformation( &mesh.matLocal, .25f, NULL, &qR, &mesh.vPosition); g_pd3dDevice->SetTransform( D3DTS_WORLD, &mesh.matLocal);

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