void Evaluate()
{
float frame = GetFrame()->GetValue();
int count = m_keys.GetCount();
if (frame <= m_keys[0].m_frame) {
//
// Before first key
//
// , add a SetRotate(const Quaternion&) to Matrix
Vector vec;
float angle = m_keys[0].m_quat.GetRotation(vec);
GetValueInternal().SetRotate(vec, angle);
} else if (frame >= m_keys[count - 1].m_frame) {
//
// After last key
//
Vector vec;
float angle = m_keys[count - 1].m_quat.GetRotation(vec);
GetValueInternal().SetRotate(vec, angle);
} else {
//
// Between two keys
//
int index = 0;
while (frame > m_keys[index + 1].m_frame) {
index++;
}
float interpolant = (frame - m_keys[index].m_frame) / (m_keys[index + 1].m_frame - m_keys[index].m_frame);
Quaternion quat = Slerp(m_keys[index].m_quat, m_keys[index + 1].m_quat, interpolant);
Vector vec;
float angle = quat.GetRotation(vec);
GetValueInternal().SetRotate(vec, angle);
}
}
