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feat(ucs): align the model grid to the active UCS

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The grid ruled along world X/Y/Z through the world origin. It now rules
along the active UCS axes through the UCS origin (passed in render/wire
space), so it lines up with the user's coordinate system. Paper space
stays plain WCS; identity UCS reproduces the old world-aligned grid.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
This commit is contained in:
Hakan Seven 2026-06-22 10:03:35 +03:00
commit 88bf2e57dc
2 changed files with 46 additions and 14 deletions
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16
src/app/view.rs
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@ -138,6 +138,20 @@ impl OpenCADStudio {
// stay independent: model tiles in model space; the sheet plus each
// floating viewport (clipped to its rectangle) in paper space. One
// enumeration for both, shared with the renderer.
// Align the model grid to the active UCS (origin in wire space, world
// axis directions); paper space stays plain WCS.
let (grid_origin, grid_axes) = if is_paper {
(glam::Vec3::ZERO, (glam::Vec3::X, glam::Vec3::Y, glam::Vec3::Z))
} else {
let (o, ux, uy, uz) = tab.ucs_xform().axes();
let wo = tab.scene.world_offset;
let o_wire = glam::Vec3::new(
o.x - wo[0] as f32,
o.y - wo[1] as f32,
o.z - wo[2] as f32,
);
(o_wire, (ux, uy, uz))
};
let grid: Vec<overlay::GridParams> = tab
.scene
.grid_views(vw, vh)
@ -148,6 +162,8 @@ impl OpenCADStudio {
view_proj: cam.view_proj(bounds),
bounds,
plane,
origin: grid_origin,
axes: grid_axes,
}
})
.collect();