ABSTRACT
As most biological structures are generally symmetrical along one dividing plane, these terms are highly effective and often additional terms such as “left” and “right” are not used
except for describing asymmetric details. This symmetry is helpful for the character modeler and the setup artist as it allows geometry and rig structures to be mirrored across planes to reduce work and to ensure symmetric functionality. Although in a 3D space, these planes are defined by the xyz-axis that they parallel, biologists havemore descriptive terms for them.Once we have an agreed upon natural stance, we can define planes that transect the body, splitting it up into regions. The body is divided into two equal halves, a left and a right by the midsagittal plane, passing through the body at the midline. Splitting the body into anterior and posterior halves is the coronal plane which passes through the body perpendicular to the midsagittal plane. Passing through at right angles to the other planes described and dividing the body into upper and lower halves is the transverse plane. For humans, the transverse plane is located around the hips, splitting the body into equal top and bottom halves.
