Field captures the light and the rendering process can be considered as a sampling procedure of light rays in space and interpolate it in the new. This course focuses on answering two questions about sampling the light field, ie how many images are needed for the field of light, and if the number is limited, where we have to catch them. Given the spectrum, we also apply the general sampling theorem on Heb data, which will produce a better rendering quality than rectangular sampling for complex scenes. Next, we describe a very general sampling frame sampling form a unique name. Freeform sampling handles three types of problems: the sample reduction, the minimum sampling rate to meet the needs of errors, and minimize the reconstruction error fixed given number of samples. When the value of the function to-be-reconstructed is unknown, the sampling sampling a unique form becomes active. Active sampling algorithm developed for the field of light and show better results than the traditional uniform sampling approach.