View API

The view package owns camera and projection math. It is backend neutral and does not apply terminal y-scale correction.

Types

• Camera3: eye, target, and up vectors.
• Viewport: output width and height.
• SensorSpec: physical sensor width and height in millimeters.
• LensSpec: focal length in millimeters plus FOV helpers.
• WorldUnit: meters represented by one world-space unit.
• ScientificCamera: Camera3 plus sensor, lens, and world-unit metadata.
• PerspectiveProjection: viewport plus perspective scale.
• OrthographicProjection: viewport plus orthographic scale.
• ProjectedVertex: projected x, y, and depth.

Camera

• Camera3::look_at(eye, target, up): builds a camera description.
• Camera3::default(distance): camera at (0, 0, -distance) looking at origin.
• Camera3::view_transform(): world-to-camera 4x4 transform.
• world_to_camera_point / world_to_camera_direction: apply the view transform.

Scientific Camera

• SensorSpec::apsc() / full_frame() / medium_format(): common sensor presets.
• SensorSpec::custom(width_mm, height_mm): custom positive sensor size.
• LensSpec::new(focal_length_mm): focal length in millimeters.
• horizontal_fov / vertical_fov / diagonal_fov: FOV helpers using 2 * atan(sensor_dimension / (2 * focal_length)).
• WorldUnit::new(meters_per_unit): explicit world-unit scale.
• ScientificCamera::auto(viewport): full-frame, 50mm default camera.
• ScientificCamera::to_perspective_projection(viewport): derives the current single-axis PerspectiveProjection.scale from vertical sensor scale.

Projection

• PerspectiveProjection::project_point(point): perspective screen projection.
• OrthographicProjection::project_point(point): orthographic screen projection.
• project_perspective_vertices / project_orthographic_vertices: batch helpers.
• interpolate_perspective_depth(p0, p1, p2, b0, b1, b2): reciprocal-depth interpolation for perspective triangle rasterization, with a safe linear fallback.