Extend rangefinder sensor to support cameras.

PiperOrigin-RevId: 848255889
Change-Id: I6e1a9ed13d29d2242558625a47e24e47ad6e87db

src/user/user_objects.cc

@@ -7313,7 +7313,6 @@ void mjCSensor::Compile(void) {
     case mjSENS_FORCE:
     case mjSENS_TORQUE:
     case mjSENS_MAGNETOMETER:
-    case mjSENS_RANGEFINDER:
     case mjSENS_CAMPROJECTION:
       // must be attached to site
       if (objtype != mjOBJ_SITE) {
@@ -7329,6 +7328,13 @@ void mjCSensor::Compile(void) {
       }
       break;
 
+    case mjSENS_RANGEFINDER:
+      // must be attached to site or camera
+      if (objtype != mjOBJ_SITE && objtype != mjOBJ_CAMERA) {
+        throw mjCError(this, "sensor must be attached to site or camera");
+      }
+      break;
+
     case mjSENS_JOINTPOS:
     case mjSENS_JOINTVEL:
     case mjSENS_JOINTACTFRC: