The glass board's marks are drawn over the glass and the figures: a dot on an empty square a piece may go to, a ring around a figure it may take or that is chosen, a halo for the last move, each on a dark rim so it reads on the pale air as well as the underworld

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01CCLa2PaEeCj8njQZSWGqHx

src/lib/components/Glass.svelte

@@ -121,15 +121,27 @@
 		}
 
 		// Marks on squares: what is selected, where it may go, the last move, a King in check.
+		// They are drawn over everything, so that neither the glass above nor a figure on the
+		// square can hide them, and each sits on a dark rim so it reads on the pale air as well as
+		// the underworld. A dot is an empty square a piece may go to; a ring hugs a figure's base.
 		const marks = new THREE.Group();
 		scene.add(marks);
-		const markGeometry = new THREE.PlaneGeometry(CELL * 0.92, CELL * 0.92);
-		function mark(i: number, colour: string, opacity: number) {
-			const m = new THREE.Mesh(markGeometry, new THREE.MeshBasicMaterial({ color: colour, transparent: true, opacity, depthWrite: false }));
-			m.userData.square = i;
-			m.rotation.x = -Math.PI / 2;
-			m.position.copy(at(i)).add(new THREE.Vector3(0, 0.015, 0));
-			marks.add(m);
+		const SHAPE = {
+			dot: [new THREE.CircleGeometry(CELL * 0.18, 24), new THREE.CircleGeometry(CELL * 0.23, 24)],
+			ring: [new THREE.RingGeometry(CELL * 0.5, CELL * 0.6, 48), new THREE.RingGeometry(CELL * 0.46, CELL * 0.64, 48)],
+			halo: [new THREE.RingGeometry(CELL * 0.66, CELL * 0.74, 48), new THREE.RingGeometry(CELL * 0.63, CELL * 0.77, 48)]
+		};
+		function mark(i: number, shape: keyof typeof SHAPE, colour: string, opacity = 1) {
+			const [face, rim] = SHAPE[shape];
+			const layers: [THREE.BufferGeometry, string, number][] = [[rim, '#1b1410', opacity * 0.75], [face, colour, opacity]];
+			for (const [geometry, color, alpha] of layers) {
+				const m = new THREE.Mesh(geometry, new THREE.MeshBasicMaterial({ color, transparent: true, opacity: alpha, depthWrite: false, depthTest: false, toneMapped: false }));
+				m.userData.square = i;
+				m.renderOrder = 10 + marks.children.length;
+				m.rotation.x = -Math.PI / 2;
+				m.position.copy(at(i)).add(new THREE.Vector3(0, 0.015, 0));
+				marks.add(m);
+			}
 		}
 
 		// Figures: one scene per kind, shared geometry, a livery per side and a dimmed one for a piece held by a Basilisk.
@@ -356,12 +368,12 @@
 		});
 		$effect(() => {
 			marks.clear();
-			for (const i of reach) mark(i, MARK.reach, 0.22);
-			for (const i of shownSquares) mark(i, MARK.last, 0.4);
-			for (const i of shownCaptured) mark(i, MARK.fallen, 0.45);
-			for (const i of targets) mark(i, MARK.target, 0.5);
-			if (selected !== null) mark(selected, MARK.selected, 0.6);
-			if (checkSquare >= 0) mark(checkSquare, MARK.check, 0.6);
+			for (const i of reach) mark(i, g.cells[i] === '' ? 'dot' : 'ring', MARK.reach, 0.85);
+			for (const i of shownSquares) mark(i, 'halo', MARK.last);
+			for (const i of shownCaptured) mark(i, 'halo', MARK.fallen);
+			for (const i of targets) mark(i, g.cells[i] === '' ? 'dot' : 'ring', MARK.target);
+			if (selected !== null) mark(selected, 'ring', MARK.selected);
+			if (checkSquare >= 0 && checkSquare !== selected) mark(checkSquare, 'ring', MARK.check);
 			wake();
 		});
 		$effect(() => look(view));