Camera3D

Perspective camera mirroring THREE.PerspectiveCamera's call shape: FOV (degrees) + aspect + near + far + position/target/up.

Conventions

• Right-handed. glam::Mat4::look_at_rh for the view; Mat4::perspective_rh for the projection.
• wgpu NDC depth range is [0, 1] — we use perspective_rh (not _rh_gl, which gives OpenGL's [-1, 1] and wastes half the depth precision).

GPU-side uniform

ViewProj is #[repr(C, align(16))] carrying view + proj + view_proj + camera_pos. 208 bytes; layout-tested.

Resize

update_aspect(width, height) clamps height >= 1 so a minimised window doesn't NaN the projection. Doesn't move the camera or change FOV — only the projection matrix shifts.

#![allow(unused)]
fn main() {
use wisp_3d::Camera3D;
use glam::Vec3;
let mut cam = Camera3D::perspective(38.0, 16.0 / 9.0, 0.1, 100.0);
cam.position = Vec3::new(0.0, 0.28, 6.2);  // 404 page values
// On window resize:
cam.update_aspect(1920, 1080);
// Per-frame upload:
let uniform = cam.view_proj_uniform();
}