Abstract
The electromagnetic environment is widespread and very complex. Due to the invisibility of the electromagnetic environment, the direct volume rendering technique can be used to show the complex electromagnetic environment. In this paper, the Irregular Terrain Model (ITM) electromagnetic wave propagation model and the coordinate transformation are used to simulate the electromagnetic environment. In the three-dimensional digital GlobelGIS platform, the improved ray casting algorithm is applied to render the electromagnetic field and design the transfer function which is used to express different electromagnetic power intensity with different colors and opacities. Considering the problem that the traditional ray casting algorithm, which uses the OpenGL graphical interface, cannot be integrated into the GlobelGIS platform directly, so the ray casting algorithm that based on OSG and the GLSL shading language for hardwareacceleration are proposed. The simulation results show that this method can render multi-source electromagnetic environment on the GlobelGIS platform in real-time and interactively. The volume rendering algorithm is not only suitable for the rendering of electromagnetic, but also for the visualization of volume data in other applications.
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