Abstract: Arbitrary section display is an important technology of full-3D gas-assisted injection
molding numerical simulation post-process. By studying the spacial position relation of the
tetrahedral element and the cutting plane, a new method is presented that is based on the pure space
geometrical analysis for obtaining the arbitrary section and high quality rendering color contour map
on the section. That is by means of traversal to determine the “effective element”, intersection
solution by class filter, and physical quantity interpolation, color mapping to obtain the physical
quantity on the section, and then to realize the rendering and display of color contour map of data
distribution on the arbitrary section with OpenGL technology. Verified by example, the method can
accurately and clearly draw the gas-assisted injection molding numerical simulation results
distribution on the arbitrary section. And it is helpful for people to understand and analyze the
simulation results more effectively.

Key words: Full-3D, gas-assisted injection molding simulation, arbitrary section display, effective
element, mapping