LOS ANGELES — Has the 3-D boom already gone bust? It’s starting to look that way — at least for American moviegoers — even as Hollywood prepares to release a glut of the gimmicky pictures.

Ripples of fear spread across Hollywood last week after “Pirates of the Caribbean: On Stranger Tides,” which cost Walt Disney Studios an estimated $400 million to make and market, did poor 3-D business in North America. While event movies have typically done 60 percent of their business in 3-D, “Stranger Tides” sold just 47 percent in 3-D. “The American consumer is rejecting 3-D,” Richard Greenfield, an analyst at the financial services company BTIG, wrote of the “Stranger Tides” results.

One movie does not make a trend, but the Memorial Day weekend did not give studio chiefs much comfort in the 3-D department. “Kung Fu Panda 2,” a Paramount Pictures release of a DreamWorks Animation film, sold $53.8 million in tickets from Thursday to Sunday, a soft total, and 3-D was 45 percent of the business, according to Paramount.

Consumer rebellion over high 3-D ticket prices plays a role, and the novelty of putting on the funny glasses is wearing off, analysts say. But there is also a deeper problem: 3-D has provided an enormous boost to the strongest films, including “Avatar” and “Alice in Wonderland,” but has actually undercut middling movies that are trying to milk the format for extra dollars.