Heart disease has been the leading cause of death both in the world and the United States
in the past decade. Computational cardiac modeling and simulation, especially patient-specific
cardiac modeling has been recognized as one of the best ways to improve diagnosis of heart
disease by providing insights in individual disease characteristics that cannot be obtained by
other means. However presenting the results of cardiac simulations to cardiologists in an
interactive manner can considerably improve the utility of cardiac models in understanding
the heart function. In this work, we have developed virtual reality and animated volume
rendering techniques to render the results of cardiac simulations. We have developed a GPU
accelerated algorithm that produces time varying voxelized representation of the quantities of
interest in a cardiac model, which can then be interactively rendered in real time. We voxelize
the different time frames of the analysis model and transfer the time-varying data to the GPU
memory using a flat data structure. This technique allows us to visualize and interact with
animation in real time. As a proof-of-concept, we test our method on interactively rendering
the simulation results of cardiac biomechanics simulations. We also present the timing results
on post-processing and rendering two different cardiac IGA at different resolutions. We achieve
an interactive frame rate of over 50 fps for all test cases
