Rapid Cross-Section Visualization Method for Large-Scale CAD Model with Repeated Structure

Cross-section visualization is an effective way to reveal interior structure of complex CAD model. The popular facet intersection based cross-section visualization method is of dense computation, it can't offer interactive cross-section visualization for large scale CAD model. The paper presents a hybrid crosssection visualization method combining facet intersection and 3D texture for large-scale repeated-structure CAD model, which is consisted of small number of basic objects. All basic objects are converted into high-resolution 3D texture during pre-processing stage; select the visual object by the visual clipping algorithm; and during the stage, determine cross-section visualization method for each object by evaluating its projection on screen. The presented algorithm has been researched on the Super MC/MCAM(multi-physics coupling analysis modeling program) developed by the FDS team of Chinese academy of science. Both HM(Hoogenboom Martin) reactor core model and ADS(accelerator driven sub-critical system) reactor model have been used for testing. The result demonstrates that the presented method can achieve similar rendering quality as facet-intersection based method, and is fast enough for interaction.