//-----------------------------------------------------------------------------
// Name: SetupMatrices()
// Desc: Sets up the world, view, and projection transform matrices.
//-----------------------------------------------------------------------------
VOID SetupMatrices()
{
// Yaw: Rotate around the Y axis
// USING MATRIX (EULER ANGLE, YAW):
//Matrix4x4 matYaw = Yaw( timeGetTime() / 2000.0f );
// USING QUATERNION:
Vector3 rotationAxis(0, 1, 0); // Rotate Y axis
float rotationAngle = sinf( timeGetTime() / 2000.0f );
Quaternion myRotation( FromAxisAngle( rotationAxis, rotationAngle ) );
Quaternion additionalRotation( 0, 0, 1, 0 );
Quaternion slerpTest = Slerp( myRotation, additionalRotation, rotationAngle );
g_rotationMatrix = ConvertToMatrix4x4( slerpTest );
// NOTE: I DON'T KNOW IF I'M USING QUATERNIONS RIGHT!!!
// Position matrix:
Matrix4x4 matMove;
if ( g_renderSetting == 6 )
matMove = Position( 0.0f, 0.0f, 0.5f * sinf( timeGetTime() / 500.0f) * 3.0f );
else
matMove = Position( 0.0f, 0.0f, 0.0f );
// Multiply the quaternion matrix by the position matrix
g_matWorld = g_rotationMatrix * matMove;
// Set it and forget it
g_pd3dDevice->SetTransform( D3DTS_WORLD, &g_matWorld.DXMatrix() );
// Set up our view matrix. A view matrix can be defined given an eye point,
// a point to lookat, and a direction for which way is up. Here, we set the
// eye five units back along the z-axis and up three units, look at the
// origin, and define "up" to be in the y-direction.
Vector3 vEyePt( 0.0f, 3.0f, -7.0f );
Vector3 vLookatPt( 0.0f, 0.0f, 0.0f );
Vector3 vUpVec( 0.0f, 1.0f, 0.0f );
Matrix4x4 matView = View( vEyePt, vLookatPt, vUpVec );
g_pd3dDevice->SetTransform( D3DTS_VIEW, &matView.DXMatrix() );
// For the projection matrix, we set up a perspective transform (which
// transforms geometry from 3D view space to 2D viewport space, with
// a perspective divide making objects smaller in the distance). To build
// a perpsective transform, we need the field of view (1/4 pi is common),
// the aspect ratio, and the near and far clipping planes (which define at
// what distances geometry should be no longer be rendered).
Matrix4x4 matProj = Perspective( D3DX_PI / 4, (float)(WIDTH) / (float)(HEIGHT), 1.0f, 100.0f );
g_pd3dDevice->SetTransform( D3DTS_PROJECTION, &matProj.DXMatrix() );
}
