Odeon version 6.5

In version 6.5, Odeon has been improved on a number of points. The major new features are listed below.

Decay curves (Auditorium and combined editions only)

The results available in the Single Point response has been extended. An extra decay curve for the intensity part of the decay is displayed on the decay curves tab, when the Show All Frequency bands option is toggled off using the A shortcut. The intensity part of the decay curve is the part of the decay, which is directional and as such, this curve is useful in order to track down echoes. If clicking one of the time-steps (by default 10 ms long) in the decay curve (which is zoom-able) Odeon will offer to display where the intensity part of that time step in the decay comes from in a 3D visualization. Note this feature can also be used in order to track down late echoes, which are formed by many reflections that arrives in the same time interval. If the Single Point results have been calculated in an earlier version of Odeon, then this result is not available unless the calculation is redone - erase the single point responses, seleceting the File|Delete Files|Delete selected results|Single point /Auralisation results option, then run the job of interest from within the JobList.

The curve may also give an indication whether the reverberant field is diffuse or not. If the intensity curve is parallel to the energy curve and approximately 6 dB below then it is an indication that the field is diffuse On the other hand if the distance between the curves are less and and indeed if the distance narrows in for increased time, then the field is not diffused. Be aware that on reason why the field is not diffuse could be because of an insufficient number of rays or a too low reflection density were used in the prediction.


3DBillard displays how a number of billiard balls are reflected from the walls in a geometry when emitted from a source. This interactive display is useful for demonstrating and investigating echo problems, scattering or coupled room effects.

Measured versus simulated

The Measured versus simulated graph is available as part of the multi point response result, allowing easy comparison between measured and simulated parameters. Measured data can be imported from a text file or pasted directly from the measurement program DIRAC.

Mouse operation

All the displays, which show the geometries in 3D can now be operated using mouse - it is though still possible to use shortcut keys if so desired. Reflections in the reflectogram can be selected, if mouse clicking the reflections (in the time as well as in the azimuth and elevation graphs).

Modelling language

New keywords has been added to the built-in modelling language of Odeon, to allow faster modelling .

The MPt keyword makes it easier to create multiple points. This multi point statement is in particular useful where some of the coordinates are repeated in the points.

The MSurf statement allows defining multiple surfaces, without having to type a new surface header for each surface.

The ElevSurf statement helps defining vertical walls in rooms such as office environments. Only the floor points need to be defined. In order to define the walls, Odeon will automatically define the ceiling points and create the walls from the floor and ceiling points. The MPt statement is very useful in conjunction with the ElevSurf statement.

The Layer statement allow dividing a geometry into separate parts, which can be displayed separately and in its own layer-colour in the 3DView, 3DOpenGL and in the Materials list. This makes it easier to investigate a selected group of surfaces. When importing a geometry from a DXF file (e.g. from AutoCAD where layers are an integrated part) the layers included in that file will be preserved.

Finally the way to define a list of corners, to be used in the description of surfaces, has been made more flexible.

Animated GIF

The animated GIF option (Graphics Interchange Format) included in Odeon 6.5 allows storing a number of images in one single file. These animated GIF's are ideal for presentation of multiple images taken from within Odeon. This allows presentation of selected images and animations on computers where Odeon is not installed e.g. or indeed to prepare a presentation. The current implementation is based on the non patented RLE compression.

The Odeon editor

The Odeon icon has been added to the toolbar in the Odeon editor. Clicking that icon in the editor will save the room and load it into Odeon. If the room is already loaded into an instance of Odeon, then it will be reloaded otherwise a new instance of Odeon will be launched with that room.