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feat(ucs): interactive UCS icon with origin-snap grips, world-fixed compass

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The UCS icon now anchors to the projected UCS origin when it is on-screen
(falling back to the bottom-left corner), and becomes a selectable object:
hover highlights it, a click shows draggable grips, and dragging the origin
grip relocates the UCS while the X/Y tip grips rotate it. Drags snap to
geometry/grid through the existing snapper, and the new UCS is persisted on
release. The icon stays selectable while parked in the corner.

Also make the ViewCube compass (N/E/S/W) world-fixed: the cube body still
reorients with the active UCS, but the cardinals project through a camera-only
rotation and snap in world frame, so the directions no longer spin with the UCS.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
This commit is contained in:
Hakan Seven 2026-06-27 01:12:45 +03:00
commit edcf24e324
10 changed files with 525 additions and 41 deletions
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29
src/scene/pipeline/viewcube.rs
View file

@ -570,6 +570,7 @@ impl ViewCubeText {
&mut self,
queue: &wgpu::Queue,
cam_rotation: Mat4,
compass_rotation: Mat4,
vp_w: u32,
vp_h: u32,
cube_px: u32,
@ -677,6 +678,21 @@ impl ViewCubeText {
// Painted flat onto the ring band (z = RING_Z) so they foreshorten with
// the ring and read upright in plan. Local axes u = +X, v = +Y give
// u × v = +Z → never mirrored when seen from above.
//
// The compass is world-fixed: it projects through `compass_rotation`
// (camera only, no UCS), so N/E/S/W stay aligned to world even when the
// cube reorients with the active UCS.
let project_world = |local: Vec3| -> Option<[f32; 2]> {
let world = compass_rotation.transform_point3(local);
let clip = view_proj * Vec4::new(world.x, world.y, world.z, 1.0);
if clip.w.abs() < 1e-6 {
return None;
}
Some([
(clip.x / clip.w + 1.0) * 0.5 * vw,
(1.0 - clip.y / clip.w) * 0.5 * vh,
])
};
const CARD_GW: f32 = 0.16; // glyph size in cube-local units
const CARD_GH: f32 = 0.22;
let cardinals = [
@ -691,7 +707,7 @@ impl ViewCubeText {
};
let center = Vec3::new(dir.x * R_CARD, dir.y * R_CARD, RING_Z);
// Dim a cardinal whose ring point sits behind the cube.
let alpha = if cam_rotation.transform_point3(center).z >= -0.15 {
let alpha = if compass_rotation.transform_point3(center).z >= -0.15 {
1.0
} else {
0.5
@ -699,10 +715,10 @@ impl ViewCubeText {
let color = [1.0, 1.0, 1.0, alpha];
let (u0, v0, u1, v1) = glyph_uv(gi, self.atlas_w, self.atlas_h);
let corner = |lx: f32, ly: f32| center + Vec3::X * lx + Vec3::Y * ly;
let tl = project(corner(-CARD_GW * 0.5, CARD_GH * 0.5));
let tr = project(corner(CARD_GW * 0.5, CARD_GH * 0.5));
let br = project(corner(CARD_GW * 0.5, -CARD_GH * 0.5));
let bl = project(corner(-CARD_GW * 0.5, -CARD_GH * 0.5));
let tl = project_world(corner(-CARD_GW * 0.5, CARD_GH * 0.5));
let tr = project_world(corner(CARD_GW * 0.5, CARD_GH * 0.5));
let br = project_world(corner(CARD_GW * 0.5, -CARD_GH * 0.5));
let bl = project_world(corner(-CARD_GW * 0.5, -CARD_GH * 0.5));
if let (Some(tl), Some(tr), Some(br), Some(bl)) = (tl, tr, br, bl) {
let mk = |pos: [f32; 2], uv: [f32; 2]| TextVertex { pos, uv, color };
verts.push(mk(tl, [u0, v0]));
@ -1210,6 +1226,7 @@ impl ViewCubePipeline {
&mut self,
queue: &wgpu::Queue,
cam_rotation: Mat4,
compass_rotation: Mat4,
vp_w: u32,
vp_h: u32,
hover: Option<usize>,
@ -1226,7 +1243,7 @@ impl ViewCubePipeline {
)),
);
self.text
.update(queue, cam_rotation, vp_w, vp_h, self.cube_px);
.update(queue, cam_rotation, compass_rotation, vp_w, vp_h, self.cube_px);
}
pub fn ensure_depth_texture(&mut self, device: &wgpu::Device, size: Size<u32>) {