What does it mean that the sagittal plane of the subject is parallel to the film?

The sagittal plane of the photographed object is parallel to the film, which means that the plane viewed from the side of the photographed object and the plastic sheet coated with latex form a line in the same direction without intersecting. Shine on the body means shine on the body. Sagittal plane refers to the longitudinal distribution of the left and right parts of the human body. All planes parallel to them along the longitudinal axis and the longitudinal axis are called sagittal planes, commonly known as side profile. Film, plastic film coated with emulsion for photography. Parallel: extending in the same direction and equidistant everywhere, forming a line in the same direction without intersecting. So the sagittal plane of the photographed object is parallel to the film, that is to say, the plane viewed from the side of the photographed object forms a line in the same direction with the plastic sheet coated with latex without intersecting.