The disclosed methods and apparatus allow a lay person to easily and intuitively define virtual scenes using natural language commands and natural gestures. Natural language commands include statements that a person would naturally (e.g., spontaneously, simply, easily, intuitively, etc.) speak without any or little training. Example natural language commands include “put a cat on the box,” or “put a ball in front of the red box.” Natural gestures include gestures that a person would naturally do, perform or carry out (e.g., spontaneously, simply, easily, intuitively, etc.) without any or little training. Example natural gestures include pointing, a distance between hands, gazing, head tilt, kicking, etc. The person can simply speak and gesture how it naturally occurs to them.