1 files changed, 0 insertions, 107 deletions
diff --git a/src/scene/primitives.ts b/src/scene/primitives.ts
deleted file mode 100644
index 384ea1d..0000000
--- a/src/scene/primitives.ts
+++ /dev/null
@@ -1,107 +0,0 @@
-import * as THREE from 'three';
-import { CSS2DObject } from 'three/addons/renderers/CSS2DRenderer.js';
-import { renderProse } from '../math';
-import type { Point } from '../physics/electricField';
-
-export const colours = { positive: '#ff967b', negative: '#73d7ff', field: '#91e2cb', gold: '#f5d58b', muted: '#8294a8' };
-export const vector = (p: Point) => new THREE.Vector3(p.x, p.y, p.z);
-export function sphere(group: THREE.Group, position: Point, radius: number, colour: string): THREE.Mesh {
-  const mesh = new THREE.Mesh(new THREE.SphereGeometry(radius, 18, 12), new THREE.MeshStandardMaterial({ color: colour, roughness: 0.3, emissive: colour, emissiveIntensity: 0.12 }));
-  mesh.position.copy(vector(position));
-  group.add(mesh);
-  return mesh;
-}
-export function box(group: THREE.Group, position: Point, dimensions: Point, colour: string, opacity = 1): THREE.Mesh {
-  const mesh = new THREE.Mesh(new THREE.BoxGeometry(dimensions.x, dimensions.y, dimensions.z), new THREE.MeshStandardMaterial({ color: colour, transparent: opacity < 1, opacity, depthWrite: opacity === 1, side: THREE.DoubleSide, roughness: 0.45 }));
-  mesh.position.copy(vector(position));
-  group.add(mesh);
-  return mesh;
-}
-export function line(group: THREE.Group, points: Point[], colour: string, opacity = 1): THREE.Line {
-  const mesh = new THREE.Line(new THREE.BufferGeometry().setFromPoints(points.map(vector)), new THREE.LineBasicMaterial({ color: colour, transparent: opacity < 1, opacity }));
-  group.add(mesh);
-  return mesh;
-}
-export function arrow(group: THREE.Group, origin: Point, direction: Point, length: number, colour = colours.field): void {
-  const dir = vector(direction);
-  if (dir.lengthSq() < 1e-24) return;
-  group.add(new THREE.ArrowHelper(dir.normalize(), vector(origin), length, colour, Math.min(0.16, length * 0.3), Math.min(0.1, length * 0.2)));
-}
-export function label(group: THREE.Group, text: string, position: Point, colour: string = '#dbe7f0', width = 2, minViewportWidth = 0): THREE.Sprite | CSS2DObject {
-  if (text.includes('$')) {
-    const element = document.createElement('div');
-    element.className = 'scene-math-label';
-    element.style.color = colour;
-    renderProse(element, text);
-    const annotation = new CSS2DObject(element);
-    annotation.position.copy(vector(position));
-    annotation.onBeforeRender = () => {
-      element.style.visibility = (element.parentElement?.clientWidth ?? Infinity) < minViewportWidth ? 'hidden' : 'visible';
-    };
-    group.add(annotation);
-    return annotation;
-  }
-  const canvas = document.createElement('canvas');
-  const context = canvas.getContext('2d')!;
-  context.font = '500 44px system-ui, sans-serif';
-  canvas.width = Math.ceil(context.measureText(text).width) + 36;
-  canvas.height = 80;
-  context.fillStyle = 'rgba(16, 24, 34, 0.85)';
-  context.fillRect(0, 0, canvas.width, canvas.height);
-  context.font = '500 44px system-ui, sans-serif';
-  context.fillStyle = colour;
-  context.textAlign = 'center';
-  context.textBaseline = 'middle';
-  context.fillText(text, canvas.width / 2, 40);
-  const texture = new THREE.CanvasTexture(canvas);
-  texture.colorSpace = THREE.SRGBColorSpace;
-  const sprite = new THREE.Sprite(new THREE.SpriteMaterial({ map: texture, depthTest: false }));
-  sprite.position.copy(vector(position));
-  const aspect = canvas.width / canvas.height;
-  const screenHeight = 23 + Math.min(2, Math.max(-1, width - 2)) * 2;
-  const viewportSize = new THREE.Vector2();
-  const cameraPosition = new THREE.Vector3();
-  // Keep labels legible when the camera or viewport changes. Width hints
-  // affect text size slightly; the actual texture fits the text content.
-  sprite.onBeforeRender = (renderer, _scene, camera) => {
-    if (!(camera instanceof THREE.PerspectiveCamera)) return;
-    sprite.getWorldPosition(cameraPosition).applyMatrix4(camera.matrixWorldInverse);
-    renderer.getSize(viewportSize);
-    sprite.material.opacity = viewportSize.x < minViewportWidth ? 0 : 1;
-    const responsiveHeight = viewportSize.x < 600 ? screenHeight * 0.78 : screenHeight;
-    const worldHeight = 2 * Math.abs(cameraPosition.z) * Math.tan(THREE.MathUtils.degToRad(camera.getEffectiveFOV()) / 2) * responsiveHeight / Math.max(1, viewportSize.y);
-    sprite.scale.set(worldHeight * aspect, worldHeight, 1);
-    sprite.updateMatrixWorld();
-  };
-  group.add(sprite);
-  return sprite;
-}
-export function grid(group: THREE.Group, y = -0.25) {
-  const helper = new THREE.GridHelper(12, 12, 0x375066, 0x22313f);
-  helper.position.y = y;
-  group.add(helper);
-}
-
-/** Dispose shared geometries/materials once per scene replacement, including
- * textures owned by generated labels. No GPU resources survive a lesson. */
-export function disposeGroup(group: THREE.Group) {
-  const geometries = new Set<THREE.BufferGeometry>();
-  const materials = new Set<THREE.Material>();
-  const textures = new Set<THREE.Texture>();
-  group.traverse(object => {
-    const mesh = object as THREE.Mesh;
-    if (mesh.geometry) geometries.add(mesh.geometry);
-    if (mesh.material) {
-      const list = Array.isArray(mesh.material) ? mesh.material : [mesh.material];
-      for (const material of list) {
-        materials.add(material);
-        const map = (material as THREE.MeshBasicMaterial).map;
-        if (map) textures.add(map);
-      }
-    }
-  });
-  geometries.forEach(geometry => geometry.dispose());
-  materials.forEach(material => material.dispose());
-  textures.forEach(texture => texture.dispose());
-  group.clear();
-}