Setting up first person camera

Question

I'm making a first person shooter game and I'm using this code
// Initializes view parameters when the window size changes.
void Game::CreateWindowSizeDependentResources()
m_miscConstants.ViewportHeight = m_deviceResources->GetScreenViewport().Height;
m_miscConstants.ViewportWidth = m_deviceResources->GetScreenViewport().Width;
m_graphics.UpdateMiscConstants(m_miscConstants);
m_graphics.GetCamera().SetOrientationMatrix(m_deviceResources->GetOrientationTransform3D());
Size outputSize = m_deviceResources->GetOutputSize();
// Setup the camera parameters for our scene.
m_graphics.GetCamera().SetViewport((UINT)outputSize.Width, (UINT)outputSize.Height);
m_graphics.GetCamera().SetPosition(XMFLOAT3());
m_graphics.GetCamera().SetLookAt(XMFLOAT3(0.0f, 0.0f, 0.0f));
float aspectRatio = outputSize.Width / outputSize.Height;
float fovAngleY = 70.0f * XM_PI / 180.0f;
if (aspectRatio < 1.0f)
// Portrait or snap view
m_graphics.GetCamera().SetUpVector(XMFLOAT3(1.0f, 0.0f, 0.0f));
fovAngleY = 120.0f * XM_PI / 180.0f;
else
// Landscape view.
m_graphics.GetCamera().SetUpVector(XMFLOAT3(0.0f, 1.0f, 0.0f));
m_graphics.GetCamera().SetProjection(XM_PI / 2, 1.0f, 0.01f, 100.0f);
// Setup lighting for our scene.
static const XMVECTORF32 s_vPos = { 5.0f, 5.0f, -2.5f, 0.f };
XMFLOAT4 dir;
DirectX::XMStoreFloat4(&dir, XMVector3Normalize(s_vPos));
m_lightConstants.ActiveLights = 1;
m_lightConstants.Ambient = XMFLOAT4(0.3f, 0.3f, 0.3f, 1.0f);
m_lightConstants.IsPointLight[0] = false;
m_lightConstants.LightColor[0] = XMFLOAT4(0.8f, 0.8f, 0.8f, 1.0f);
m_lightConstants.LightDirection[0] = dir;
m_lightConstants.LightSpecularIntensity[0].x = 2;
m_graphics.UpdateLightConstants(m_lightConstants);
How do I set the cameras position to first person?

Answer 1

What does setting the cameras position to first person mean?
Talk through the answer to that question and then think about how to implement that in code.
For example, if you define a first person camera as:
"A first person camera is positioned at head height and moves around with the player, aiming in the direction the user looking."
Then you need to set two properties on the camera:
The match the player's position, at head height
The direction it is looking: to match the direction the player is looking
And if you look at the Camera you'll see it has functions to set each of these, so as the user moves you can call SetPosition and SetLookAt to match the player's position and direction.