Module view 

The interactive viewer camera (R21/R25): orthographic default + perspective toggle with state-preserving switch, zoom-to-fit, dynamic depth-range fit, world-per-pixel and world→screen queries. Pure f64 math — shared verbatim by the wasm canvas shell and the winit desktop shell (dual-target directive).

Screen coordinates throughout are CSS pixels with the origin at the canvas top-left, y down (what browser pointer events deliver); the DPR only matters at surface-size time, never in camera math (matching the retired viewer, whose thresholds were CSS-pixel based).

Structs

Ray

A world-space ray for picking.

ViewCamera

Enums

Projection

The projection kind (R21): orthographic is the default; the toggle keeps the apparent size at the target plane.

Functions

add3

cross3

dot3

invert4_columns

Inverse of a column-major 4×4 matrix (index = col*4 + row layout). Returns None if singular. Used to invert the view-projection for the host overlays’ screen→world path.

len3

norm3

rotate3

Rotate v around unit axis by angle (Rodrigues).

scale3

sub3