client/src/components/ThreeVIew.tsx

@@ -31,13 +31,12 @@ export type ThreeViewProps = {
 }
 
 function setupScene(size: { w: number, h: number }): { scene: THREE.Scene, camera: THREE.PerspectiveCamera } {
-    THREE.Object3D.DEFAULT_UP.set(0, 0, 1);
-
     // --- Scene & Camera ---
     const scene = new THREE.Scene();
     scene.background = new THREE.Color(0x0a0a12);
 
     const camera = new THREE.PerspectiveCamera(55, size.w / size.h, 0.1, 100);
+    camera.position.set(4, 3, 6);
 
     // --- Lights ---
     scene.add(new THREE.AmbientLight(0xffffff, 0.3));
@@ -51,20 +50,15 @@ function setupScene(size: { w: number, h: number }): { scene: THREE.Scene, camer
     pt.position.set(-3, 2, -3);
     scene.add(pt);
 
-    // const plane = new THREE.Mesh(
-    //     new THREE.PlaneGeometry(14, 14),
-    //     new THREE.MeshStandardMaterial({ color: 0x080810 })
-    // );
-    // plane.rotation.x = -Math.PI / 2;
-    // plane.receiveShadow = true;
+    // --- Floor & Grid ---
+    const plane = new THREE.Mesh(
+        new THREE.PlaneGeometry(14, 14),
+        new THREE.MeshStandardMaterial({ color: 0x080810 })
+    );
+    plane.rotation.x = -Math.PI / 2;
+    plane.receiveShadow = true;
     // scene.add(plane);
-
-    const xyGrid = new THREE.GridHelper(14, 14, 0x222233, 0x111122);
-    xyGrid.rotation.x = Math.PI / 2
-    scene.add(xyGrid);
-
-    const axesHelper = new THREE.AxesHelper(2).setColors('red', 'green', 'blue');
-    scene.add(axesHelper);
+    // scene.add(new THREE.GridHelper(14, 14, 0x222233, 0x111122));
 
     return { scene, camera };
 }

client/src/components/Viewport.tsx

@@ -9,10 +9,10 @@ export const Viewport = function () {
     function handleMouseMove(e: ThreeViewMouseEventArgs) {
         state.setHitTest(e.screenPosition, e.hitResults);
 
-        sceneHelper.clearHints();
+        sceneHelper.clear();
         if (e.hitResults.hits.length) {
             e.hitResults.hits.forEach((hit) => {
-                    sceneHelper.showPointHint(hit.object.uuid, hit.intersection.point);
+                sceneHelper.showPoint(hit.object.uuid, hit.point);
             })
             // console.log(e.position);
             // console.log(e.hitTest.objects.map((o) => o));
@@ -26,7 +26,7 @@ export const Viewport = function () {
 
         sceneHelper.setSelection(hoveredFaceIds);
 
-        sceneHelper.showMouseFrustumHint();
+        sceneHelper.showMouseFrustum();
     }
 
     function handleDispose(e: ThreeViewEventArgs): void {

client/src/helpers/circularFrustumIntersect.ts

@@ -55,7 +55,7 @@ const BARYCENTRIC_EPSILON = 1e-1;
 function classifyTriangleHit(
     point: THREE.Vector3,
     tri: ExtendedTriangle,
-    vertexIds: [Id, Id, Id],
+    vertexIds: Id[],
 ): TriangleHitDetail {
     // Compute barycentric coords via areas
     const ab = tri.b.clone().sub(tri.a);
@@ -232,7 +232,7 @@ export class CircularFrustumIntersection {
             intersectsBounds: (box: THREE.Box3) => intersectionResultToBvh(CircularFrustumIntersection.intersectsBox(box, localFrustum)),
 
             intersectsTriangle: (tri: ExtendedTriangle, triIndex: number, contained: boolean) => {
-                const tiangleVertexIds = getGeometryVertextIds(triIndex) ?? ['','',''];
+                const tiangleVertexIds = getGeometryVertextIds(triIndex);
 
                 if (contained) {
                     const worldPoint = tri.a.clone().applyMatrix4(mesh.matrixWorld);
@@ -242,7 +242,7 @@ export class CircularFrustumIntersection {
                         point: worldPoint,
                         depth,
                         triangle: tri,
-                        triHit: classifyTriangleHit(tri.a, tri, tiangleVertexIds),
+                        triHit: classifyTriangleHit(tri.a, tri, tiangleVertexIds ?? []),
                         vertexIds: tiangleVertexIds,
                     });
                     return !findAll;

client/src/helpers/hooks/useInteration.ts

@@ -1,13 +1,9 @@
 import { useEffect, type RefObject } from "react";
 import * as THREE from "three";
 import { normalizeScreenPosition } from "../normalizeScreenPosition";
-import { formatPoint } from "../stringFormat";
 
 const CLICK_THRESHOLD = 2; // px
 
-function clamp(v: number, min: number, max: number): number {
-    return Math.max(min, Math.min(max, v))
-}
 export type InteractionMouseEventArgs = {
     screenPosition: THREE.Vector2Like,
     position: THREE.Vector2Like,
@@ -41,22 +37,14 @@ export function useInteraction(
             let isRightDrag = false;
             let startX = 0, startY = 0;
             let lastX = 0, lastY = 0;
-            let azimuth = 0, elevation = 1, radius = 8;
-            let targetPoint = new THREE.Vector3();
-
-            let rotationSpeed = 0.005;
-
-            // prevent flip at poles
-            const epsilon = 0.0001;
+            let theta = 0.8, phi = 0.9, radius = 8;
+            let targetX = 0, targetY = 0;
 
             function updateCamera() {
-                const cosEl = Math.cos(elevation);
-                const x = targetPoint.x + radius * cosEl * Math.cos(azimuth);
-                const y = targetPoint.y + radius * cosEl * Math.sin(azimuth);
-                const z = targetPoint.z + radius * Math.sin(elevation);
-                camera.position.set(x, y, z)
-                camera.lookAt(targetPoint);
-                console.log(`${formatPoint(camera.position)} ${azimuth} ${elevation}`);
+                camera.position.x = targetX + radius * Math.sin(phi) * Math.sin(theta);
+                camera.position.y = radius * Math.cos(phi);
+                camera.position.z = targetY + radius * Math.sin(phi) * Math.cos(theta);
+                camera.lookAt(targetX, 0, targetY);
             }
             updateCamera();
 
@@ -89,12 +77,11 @@ export function useInteraction(
                 lastX = e.clientX;
                 lastY = e.clientY;
                 if (isRightDrag) {
-                    targetPoint.x -= dx * 0.01;
-                    targetPoint.y += dy * 0.01;
+                    targetX -= dx * 0.01;
+                    targetY += dy * 0.01;
                 } else {
-                    azimuth = azimuth - dx * rotationSpeed;
-                    elevation = elevation + dy * rotationSpeed;
-                    elevation = Math.max(-Math.PI / 2 + epsilon, Math.min(Math.PI / 2 - epsilon, elevation + dy * rotationSpeed));
+                    theta -= dx * 0.005;
+                    phi = Math.max(0.15, Math.min(Math.PI - 0.15, phi - dy * 0.005));
                 }
                 updateCamera();
             };

client/src/helpers/sceneHelper.ts

@@ -2,7 +2,7 @@ import type { ColorRepresentation, Object3D, Object3DEventMap, OrthographicCamer
 import { SceneSync } from "../layers/sceneSync";
 import { GeometryCache } from "../layers/geometryCache";
 import type { Id } from "../types";
-import { CircularFrustumIntersection, type Intersection, type HitResults, type HitResult } from "./circularFrustumIntersect";
+import { CircularFrustumIntersection, type HitResult, type HitResults } from "./circularFrustumIntersect";
 import { CircularFrustum } from "./circularFrustum";
 import './bvh';
 import { VolatileGeometryHelper, type VolatileGeometryOptions } from "./volatileGeometryHelper";
@@ -71,15 +71,15 @@ export class SceneHelper {
         this.hints?.set(id, position, options);
     }
 
-    public showPointHint(id: string, position: Vector3Like, size: number = 0.05, color: ColorRepresentation = 0xffffff) {
+    public showPoint(id: string, position: Vector3Like, size: number = 0.05, color: ColorRepresentation = 0xffffff) {
         this.hints?.set(id, position, { kind: "point", size, color });
     }
 
-    public showCircleHint(id: string, position: Vector3Like, radius: number, thickness: number = 0.1, color: ColorRepresentation = 0xffffff) {
+    public showCircle(id: string, position: Vector3Like, radius: number, thickness: number = 0.1, color: ColorRepresentation = 0xffffff) {
         this.hints?.set(id, position, { kind: "circle", radius, thickness, color });
     }
 
-    public showMouseFrustumHint() {
+    public showMouseFrustum() {
         if (!this.camera)
             throw new Error('Camera is not initialized');
 
@@ -90,17 +90,17 @@ export class SceneHelper {
         const near = frustum.getCircleAtDepth(nearDepth);
         const far = frustum.getCircleAtDepth(farDepth);
 
-        this.showCircleHint('hittest_near', near.center, near.radius, 0.05);
-        this.showCircleHint('hittest_far', far.center, far.radius, 0.1, 'red');
+        this.showCircle('hittest_near', near.center, near.radius, 0.05);
+        this.showCircle('hittest_far', far.center, far.radius, 0.1, 'red');
     }
 
-    public clearHints() {
+    public clear() {
         this.hints?.dispose();
     }
 
     public dispose() {
         this.sync?.dispose();
 
-        this.clearHints();
+        this.clear();
     }
 }

client/src/helpers/stringFormat.ts

@@ -1,6 +0,0 @@
-import type { Vector3Like } from "three";
-
-export function formatPoint(point: Vector3Like): string {
-    return [point.x, point.y, point.z].map((v) => v.toFixed(3)).join('; ');
-}
-

client/src/layers/sceneSync.ts

@@ -47,6 +47,9 @@ export class SceneSync {
     // Called when FE scene graph syncs from BE
     addSolid(dto: MeshDto) {
         const faceId = dto.faceId;
+        const transform = new Float32Array([
+            1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1
+        ]);
 
         if (this.meshByFace[faceId])
             return;
@@ -58,10 +61,23 @@ export class SceneSync {
         mesh.userData.surfaceId = dto.surfaceId;
         mesh.userData.solidId = dto.solidId;
 
+        // Apply transform (col-major mat4 from BE)
+        const m = new THREE.Matrix4();
+        m.fromArray(transform);   // THREE expects col-major
+        mesh.applyMatrix4(m);
+
         this.scene.add(mesh);
         this.meshByFace[faceId] = mesh;
     }
 
+    updateTransform(faceId: Id, colMajorMat4: number[]) {
+        const mesh = this.meshByFace[faceId];
+        if (!mesh) return;
+        const m = new THREE.Matrix4().fromArray(colMajorMat4);
+        mesh.matrix.copy(m);
+        mesh.matrix.decompose(mesh.position, mesh.quaternion, mesh.scale);
+    }
+
     setSelected(faceIds: Id[]) {
         this._selectedFaceIds = faceIds;