My son was a rising senior last year. He attended several prospect camps and experienced a range of responses, or lack thereof, from various schools.
At one camp (for the school he ended up committing to), personal, individual attention was shown to him during and after the camp. It was fairly obvious that they were interested in him. At another camp for a large Big 12 program, it was obvious that the school was NOT interested in our son, as the recruiting coordinator paid attention to 6-8 studs and essentially ignored everyone else (the other 200 players). We thought the camp was a bust until the coach of a feeder JUCO emailed the following week, saying the Big 12 school had recommended that they recruit our son. Obviously, the Big 12 noticed our son's talent even though they didn't indicate that at the camp. At other camps, son did not get any interest during or after the camps.
If you are approached after a camp, GREAT!! If not, don't get too disheartened. I would recommend emailing the recruiting coordinator and head coach to thank them for having you. Emphasize your interest in their program and provide them with a playing schedule for the rest of the summer and fall, as well as contact names and numbers. If they are interested, they will email or call you back.
Best wishes as you begin the process!