//-----------------------------------------------------------------------------
// Name: Bound::operator*
// Desc: transforms the bound by the current matrix
//-----------------------------------------------------------------------------
Bound Bound::operator*( CXMMATRIX World ) const
{
//$OPTIMIZE: store matrix decomposed
XMVECTOR Translation = World.r[3];
FLOAT Scale = XMVectorGetX( XMVector3Length( World.r[2] ) );
XMVECTOR Rotation = XMQuaternionNormalize( XMQuaternionRotationMatrix( World ) );
// switch based off this bounds type and call the correct
// bound transform function
switch( m_Type )
{
case Bound::Sphere_Bound:
{
Sphere WorldSphere = GetSphere();
TransformSphere( &WorldSphere,
&WorldSphere,
Scale,
Rotation,
Translation );
return Bound( WorldSphere );
}
case Bound::Frustum_Bound:
{
Frustum WorldFrustum = GetFrustum();
TransformFrustum( &WorldFrustum,
&WorldFrustum,
Scale,
Rotation,
Translation );
return Bound( WorldFrustum );
}
case Bound::OBB_Bound:
{
OrientedBox WorldObb = GetObb();
TransformOrientedBox( &WorldObb,
&WorldObb,
Scale,
Rotation,
Translation );
return Bound( WorldObb );
}
case Bound::AABB_Bound:
{
AxisAlignedBox WorldAabb = GetAabb();
TransformAxisAlignedBox( &WorldAabb,
&WorldAabb,
Scale,
Rotation,
Translation );
return Bound( WorldAabb );
}
case Bound::No_Bound:
return Bound();
}
return Bound();
}
//! Returns the camera frustum in world space.
Frustum Camera::GetFrustum()
{
XMVECTOR scale, rotation, translation, detView;
// The frustum is in view space, so we need to get the inverse view matrix
// to transform it to world space.
XMMATRIX invView = XMMatrixInverse(&detView, XMLoadFloat4x4(&GetViewMatrix()));
// Decompose the inverse view matrix and transform the frustum with the components.
XMMatrixDecompose(&scale, &rotation, &translation, invView);
Frustum worldFrustum;
TransformFrustum(&worldFrustum, &mFrustum, XMVectorGetX(scale), rotation, translation);
// Return the transformed frustum that now is in world space.
return worldFrustum;
}
