# v_ase constraint guide design preview

This is a standalone visual design sheet. It shows always-visible, local markers for constrained atoms without using a COM-centered plane. Drag to rotate, scroll to zoom.

## FixAtoms baseline

1. Faceted / etched material: fixed slab atoms keep their element hue but use a rough, cut-stone surface state.

## FixedLine candidates

1. Axis filament: a short luminous line through the atom.
2. Dual rail: two thin rails bracketing the allowed direction.
3. Bead track: sparse beads along the allowed 1D channel.
4. Direction ticks: center line plus small perpendicular tick marks.
5. Glass sleeve: a transparent tube with a fine central rail.

## FixedPlane candidates

1. Local disk: small translucent disk, ring, crosshair, normal tick.
2. Annulus only: clean halo ring plus normal pin, almost no fill.
3. Tangent axes: two in-plane guide axes with direction caps.
4. Sparse wafer: small plate with a sparse local grid.
5. Contour lens: concentric local rings plus normal tick.

Final direction: use FixedLine #1 for a single center axis and FixedPlane #1 or #5. They stay local to each atom, avoid COM ambiguity, and remain readable when several constrained atoms are visible.
FixedLine: left column / FixedPlane: right column / FixAtoms: faceted slab