1. A method of performing a ray-node intersection test, the method comprising: generating a ray in a rendering scene; tracing a path of the ray in an acceleration structure comprising nodes; and performing the ray-node intersection test to locate a node that intersects the ray, wherein the ray-node intersection test comprises: receiving an input comprising fixed-point numbers representing coordinates of a bounding box and an origin coordinate of the ray; obtaining difference values between the input coordinates of the bounding box and the input origin coordinate; and obtaining multiplication values between the obtained difference values and a reciprocal number of a direction vector of the ray, wherein the reciprocal number is a floating-point number, and wherein the obtaining of the multiplication values comprises: obtaining an added value by adding a predetermined value to a mantissa of the reciprocal number; determining a sign of the added value; and obtaining multiplication values between the added value to which the determined sign is applied and the differences values.