Features of radiometric quantities synthetic images formation in the IR region of the spectrum

Physically correct synthetic images of 3D scenes in a given wavelength range are of great importance in solving some applied problems. Such data generation is based on a physical interactions modelling, including electromagnetic radiation propagation in a scene space. This paper presents the results of a ray tracing mechanism development in a 3D scene modeling software package. An algorithm for calculation radiative heat transfer that allows accounting a radiation from multiple bodies in the scene is proposed. In order to be executed on graphical processors it is implemented in form of shader programs. Each emitted ray, which simulates the propagation of an electromagnetic wave, undergoes no more than two interactions with bodies and makes an addition to an observed area radiation in a number of photons given wavelengths range and solid angle. To evaluate the algorithm a number of model scenes were proposed, on which comparative study was carried out in case of infrared region modeling. As results show, taking into account the mechanisms of radiative heat transfer allow for qualitative improvement of the resulting images and makes a significant contribution to the background signal.