Camera
A [see page 6, camera] gives us a viewpoint into our scene.
It can be:
- Positioned anywhere in the world coordinate system.
- Point anywhere.
- Rotate about the viewing direction.
The cameras see page 4, view space is parameterised by:
| Term | Meaning |
|---|---|
| Viewpoint | Where the camera is positioned. |
| Viewing Direction | Where the camera is facing. |
| View-Volume | The area of the world that can be seen. |
To convert world coordinates to view coordinates we define the matrix \(T_{view}\) such that multiplying by \(T_{view}^{-1}\) (the reverse of the following):
- moves \(C\) (the camera location) to the world origin.
- rotates the \(U,V,N\) axes to [see page 7, align] with the world axes.
Warn: multiplying by \(T_{view}\) often puts \(N\) onto the -ve \(Z\) axis so we'll need to account for this.