Breezes affect jump shots. Rain stops games. Otherwise, the CarMax Summer Basketball League for 17-and-under boys and girls at Pine Camp Arts and Community Center on Old Brook Road closely resembles in-season hoops. Observers of all ages occupy the bleachers and lawn chairs, or just stand and watch, as some of the area’s finest players in high school, middle school and elementary school go at it under the lights in intense games with experienced officials.