Fix DICOM UPP model pivot

DICOM_and_UPP配准/static/app.js

@@ -94,6 +94,8 @@ const state = {
   modelMeshes: [],
   stlSignature: "",
   baseModelScale: 1,
+  modelBoundsFrame: null,
+  modelLocalBounds: null,
   dicomSceneBox: null,
   mappingViewport: { scale: 1, offsetX: 0, offsetY: 0, rotation: 0 },
   mappingDrag: null,
@@ -1018,6 +1020,8 @@ function clearFusion() {
   state.dicomPlane = null;
   state.dicomPoints = null;
   state.dicomSlicePlanes = [];
+  state.modelBoundsFrame = null;
+  state.modelLocalBounds = null;
   $("fusionMeta").textContent = "DICOM - · STL -";
   $("fusionStatus").textContent = "等待选择 DICOM 与 STL";
   updateSliceControl();
@@ -1449,6 +1453,7 @@ async function buildDicomVolume(volume) {
   const centerIndex = Number(volume.center || 0);
   const total = Math.max(1, Number(volume.total || 1));
   const indices = volume.indices || [];
+  const frames = volume.frames || [];
   const centerPosition = indices.length ? Math.floor(indices.length / 2) : 0;
   state.volumeScene = {
     width,
@@ -1477,7 +1482,7 @@ async function buildDicomVolume(volume) {
   const rangeDepth = Math.max(0.015, Math.abs(sliceToSceneZ(localEnd) - sliceToSceneZ(localStart)));
   const rangeBox = new THREE.LineSegments(
     new THREE.EdgesGeometry(new THREE.BoxGeometry(width * 0.94, height * 0.94, rangeDepth)),
-    new THREE.LineBasicMaterial({ color: 0xfacc15, transparent: true, opacity: 0.56 }),
+    new THREE.LineBasicMaterial({ color: 0x38bdf8, transparent: true, opacity: 0.24 }),
   );
   rangeBox.position.z = (sliceToSceneZ(localStart) + sliceToSceneZ(localEnd)) / 2;
   state.dicomGroup.add(rangeBox);
@@ -1527,7 +1532,6 @@ async function buildDicomVolume(volume) {
 
   const pointPositions = [];
   const pointColors = [];
-  const frames = volume.frames || [];
   for (const [index, frame] of frames.entries()) {
     const image = await loadImageData(frame, 180);
     const stride = Math.max(2, Math.round(Math.max(image.width, image.height) / fusionDetail.pointGrid));
@@ -1578,6 +1582,8 @@ async function buildStlModels(volume, onProgress = null) {
   }
   clearGroup(state.rawModelGroup);
   state.modelMeshes = [];
+  state.modelBoundsFrame = null;
+  state.modelLocalBounds = null;
   state.stlSignature = signature;
   const files = state.stlFiles.filter((file) => state.selectedStlIds.has(Number(file.id)));
   if (!files.length) {
@@ -1618,8 +1624,33 @@ async function buildStlModels(volume, onProgress = null) {
   }
   const bbox = new THREE.Box3().setFromObject(state.rawModelGroup);
   const center = new THREE.Vector3();
+  const size = new THREE.Vector3();
   bbox.getCenter(center);
-  state.rawModelGroup.position.set(-center.x, -center.y, -center.z);
+  bbox.getSize(size);
+  state.rawModelGroup.position.set(0, 0, 0);
+  state.rawModelGroup.traverse((object) => {
+    if (!object.geometry) return;
+    object.geometry.translate(-center.x, -center.y, -center.z);
+    object.geometry.computeBoundingBox?.();
+    object.geometry.computeBoundingSphere?.();
+    object.geometry.computeVertexNormals?.();
+  });
+  const maxModelSize = Math.max(size.x, size.y, size.z, 1);
+  const volumeSize = state.volumeScene
+    ? Math.max(state.volumeScene.width, state.volumeScene.height, state.volumeScene.depth, 1)
+    : 4.8;
+  state.baseModelScale = (volumeSize / maxModelSize) * 0.92;
+  state.modelLocalBounds = {
+    center: { x: center.x, y: center.y, z: center.z },
+    size: { x: size.x, y: size.y, z: size.z },
+  };
+  const modelBounds = new THREE.LineSegments(
+    new THREE.EdgesGeometry(new THREE.BoxGeometry(size.x, size.y, size.z)),
+    new THREE.LineBasicMaterial({ color: 0xfacc15, transparent: true, opacity: 0.78 }),
+  );
+  modelBounds.name = "model-bounds";
+  state.rawModelGroup.add(modelBounds);
+  state.modelBoundsFrame = modelBounds;
   applyPose();
   scheduleMappingDraw();
   onProgress?.(100);