fix: 优化空格播放和截图角色标签对不上

src/editor/canvas/SceneRoot.tsx

@@ -41,6 +41,7 @@ import { getEffectiveGroundOpacity } from "./panoramaMath";
 import { getGroundAxisLines } from "./sceneAxes";
 import { GROUND_GRID_ELEVATION, GROUND_PLANE_SIZE, GROUND_SURFACE_SIDE } from "./sceneGround";
 import { getSceneGroupTransform } from "./sceneTransform";
+import { HIDE_FROM_VIEWPORT_CAPTURE_KEY } from "./viewportCapture";
 import { getCrowdAnchorTransform } from "../store/directorStore";
 
 export { getEffectiveGroundOpacity, getPanoramaRotationRadians } from "./panoramaMath";
@@ -55,7 +56,6 @@ const VIEWPORT_CAMERA_LINE_OPACITY = 0.92;
 const VIEWPORT_CAMERA_HIT_PADDING = 0.06;
 const VIEWPORT_CAMERA_FORWARD = new Vector3(0, 0, 1);
 const VIEWPORT_CAMERA_WORLD_UP = new Vector3(0, 1, 0);
-const HIDE_FROM_VIEWPORT_CAPTURE_KEY = "hideFromViewportCapture";
 const VIEWPORT_CAMERA_BODY_CENTER: CameraWirePoint = [0, 0, -0.52 * VIEWPORT_CAMERA_VISUAL_SCALE];
 const VIEWPORT_CAMERA_BODY_SIZE: CameraWirePoint = [
   0.4 * VIEWPORT_CAMERA_VISUAL_SCALE,
@@ -967,14 +967,17 @@ function TrajectoryPath({
               <circleGeometry args={[0.3, 24]} />
               <meshBasicMaterial depthWrite={false} opacity={0} transparent />
             </mesh>
-            {/* 实心小球：选中用高亮色，否则用角色色 */}
+            {/* 实心小球：选中用高亮色，否则用角色色。
+                这里必须写深度（用材质默认值 true，别改成 false）：地面是 transparent 材质，
+                即使透明度为 1 也走透明通道、排在所有不透明物体之后渲染；
+                小球一旦不写深度，地面就会整片盖住它 —— 表现就是「地面不透明时看不到轨迹点」。 */}
             <mesh
               name={`trajectory-point-${point.id}`}
               userData={{ [HIDE_FROM_VIEWPORT_CAPTURE_KEY]: true }}
               onClick={interactive ? (event) => selectPoint(point.id, event) : undefined}
             >
               <sphereGeometry args={[0.1, 18, 14]} />
-              <meshBasicMaterial color={selected ? TRAJECTORY_SELECTED_COLOR : color} depthWrite={false} />
+              <meshBasicMaterial color={selected ? TRAJECTORY_SELECTED_COLOR : color} />
             </mesh>
           </group>
         );
@@ -1073,7 +1076,7 @@ export function SceneRoot() {
           <mesh position={[0, scene.groundHeight, 0]} rotation={[-Math.PI / 2, 0, 0]}>
             <planeGeometry args={[GROUND_PLANE_SIZE, GROUND_PLANE_SIZE]} />
             <meshBasicMaterial
-              color="#303640"
+              color={scene.groundColor}
               opacity={getEffectiveGroundOpacity(scene.groundOpacity, Boolean(panoramaAsset))}
               polygonOffset
               polygonOffsetFactor={1}