The Miami Heat’s summer roster quickly is becoming one highlighted by big men. The latest addition is undrafted Fresno State junior Orlando Robinson, a 6-foot-11, 244-pound center with a 9-foot standing reach and 7 1/2-foot wingspan. Robinson, a source confirmed to the South Florida Sun Sentinel, agreed to an Exhibit 10 contract, which also creates a path to the team’s training camp. The first-team All-Mountain West selection is a deft offensive player who utilizes his skill and physicality to score at all three levels.