The development of the ODEON program has been continued in the year 2000. Some of the main improvements include visualisation of 3D models using OpenGL™ and a new colour code that directly relates to the frequency-dependent sound reflecting properties of the surfaces. Thus the acoustic reflectance of materials is converted directly into a visual representation, where red represents low-frequency reflectance, green represents mid-frequency reflectance, and blue represents high-frequency reflectance. In this way totally absorbing surfaces appear as black, whereas totally reflecting surfaces are white, and the surface colours appear in a visually plausible way, making it very easy to read the acoustics properties of the surfaces in a model of a room. Angle dependent absorption has been included in point response calculations as well as in the calculation of global decays. The calculation method uses the diffuse field absorption coefficients as input, but angle dependent reflection factors taking into account the angles of incidence and sizes of surfaces are estimated. Early scattering has been included in the calculation of point responses. The calculation of early-reflected sound has been split into an image source part and a ray-tracing part allowing realistic calculation of scattered sound in early reflections. Instead of handling the early reflections as purely specular, reflections are now split into specular contributions (image sources) and ‘scattering trees’ obtained using ray tracing. This new calculation method improves results in particular when highly diffusing surfaces are present and the increase in calculation time is minimal.
|Effective start/end date||01/05/1984 → …|
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