feat: move_camera.txt 改为速度段格式驱动相机运动

格式：
  1-60   vx=1.0  rx=10         # 1-60帧：x平移1/帧 + 绕x转10°/帧
  30-90  vy=2.0  ry=20  rz=10  # 30-90帧：y平移2/帧 + 绕y转20°/帧 + 绕z转10°/帧

draw.py 每帧累加平移速度修改center，累加旋转速度修改
elevation/azimuth，实现连续平滑的相机运动。

compute.py

@@ -87,25 +87,50 @@ Z_MIN = None
 Z_MAX = None
 
 
-def _load_camera_keyframes(path):
-    """读取 move_camera.txt，返回 JSON 数组字符串 [[frame,dist,el,az],...] 或空串。"""
+def _load_camera_motion(path):
+    """读取 move_camera.txt（速度段格式），返回 JSON 字符串。
+    
+    格式：每行是一个运动段
+      start-end  vx=f1 vy=f2 vz=f3  rx=d1 ry=d2 rz=d3
+    示例：
+      1-60   vx=1.0  rx=10
+      30-90  vy=2.0  ry=20  rz=10
+    
+    返回 JSON: [{"start":N,"end":N,"v":[x,y,z],"r":[x,y,z]},...]
+    """
+    import re
     if not os.path.exists(path):
         print(f"[compute] 警告: 未找到 {path}，跳过运动相机")
         return ""
-    keyframes = []
+    segments = []
     with open(path, "r", encoding="utf-8") as f:
         for line in f:
             line = line.strip()
             if not line or line.startswith("#"):
                 continue
-            parts = line.split()
-            if len(parts) >= 4:
-                keyframes.append([int(parts[0]), float(parts[1]),
-                                   float(parts[2]), float(parts[3])])
-    if not keyframes:
+            # 解析帧范围
+            m = re.match(r'(\d+)\s*-\s*(\d+)', line)
+            if not m:
+                continue
+            start, end = int(m.group(1)), int(m.group(2))
+            v = [0.0, 0.0, 0.0]
+            r = [0.0, 0.0, 0.0]
+            # 解析 vx=, vy=, vz=
+            for i, axis in enumerate(['x', 'y', 'z']):
+                m2 = re.search(r'v' + axis + r'\s*=\s*([-\d.]+)', line)
+                if m2:
+                    v[i] = float(m2.group(1))
+            # 解析 rx=, ry=, rz=
+            for i, axis in enumerate(['x', 'y', 'z']):
+                m2 = re.search(r'r' + axis + r'\s*=\s*([-\d.]+)', line)
+                if m2:
+                    r[i] = float(m2.group(1))
+            if any(v) or any(r):
+                segments.append({"start": start, "end": end, "v": v, "r": r})
+    if not segments:
         return ""
     import json
-    return json.dumps(keyframes)
+    return json.dumps(segments)
 
 
 def _to_text_value(value):
@@ -757,7 +782,7 @@ def run_from_config(config, out_dir=None):
         cam_path = cam_rel
         if out_dir is not None and not os.path.isabs(cam_rel):
             cam_path = os.path.join(out_dir, cam_rel)
-        camera_keyframes_raw = _load_camera_keyframes(cam_path)
+        camera_keyframes_raw = _load_camera_motion(cam_path)
 
     print(f"[compute] 使用算法: {METHOD}")
     print(f"[compute] 已加载成键信息: {len(BOND_PAIRS)} 条键")