View Design

Responsibilities

• Convert world-space points and directions into camera space.
• Project camera-space points into viewport coordinates.
• Provide backend-neutral perspective-correct depth interpolation.
• Keep terminal and backend concerns outside the view package.

Conventions

Camera-space positive z is in front of the camera. Camera3::look_at builds a view transform using right, true_up, and forward basis vectors.

Limitations

The first version exposes compact projection helpers instead of full clipping, near/far planes, or unprojection.