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Methods and apparatuses for selecting levels of detail for objects having multi-resolution models in graphics displays

The level of detail selected for each object in a scene is determined based upon a variable normalized risk parameter which may be supplied by the application. A recursive composite parent object process is invoked upon the two children of the scene object in order to allocate graphics resources to objects A and B. Primary and secondary hit value means corresponding to objects A and B are computed. The hit value means are the average sum of hit values recorded for all the leaf objects contained by the objects over a predetermined number of frames. The statistical variances of the primary hit value and secondary hit value are also computed over the previous predetermined number of frames in order facilitates the mapping of the normalized risk parameter to a non-normalized risk parameter indicating the optimal risk for objects A and object B. A quadratic parametric variance equation is solved for the optimal fraction of the remaining graphics resources to be allocated to object A. The optimal fraction is multiplied by the available graphics resources, resulting in the resources allocated to object A; the remaining graphics resources are to object B. If either object A or B is a leaf object, the level of detail is selected for object A or B as the level of detail associated with object A or B requiring the greatest amount of graphics resources not exceeding the resources allocated to object A or B. If either object A or B is a composite parent object, the recursive parent object process is invoked on the two children of object A or B with the available graphics resources for the instantiation of the recursive parent object process set to the graphics resources allocated to object A or B. After levels of detail for all objects in the scene has been achieved, the method according to the present invention renders all leaf objects.
Owner:XEROX CORP

Wind Turbine and Method for the Automatic Correction of Wind Vane Settings

The invention relates to a wind turbine comprising a machine housing (12) equipped with a rotor (14), which is mounted to pivot on a sub-structure (10). Wind parameters and an electromechanical quantity are determined by means of measuring devices (21, 22, 23). To enable the machine housing (12) to track the wind, the wind turbine is equipped with a pivoting device (11) comprising a controller (8). The wind turbine is also equipped with a calibration module (2), which is configured to determine an effective mass of the electromechanical quantity using the wind speed. In addition, the turbine comprises an evaluation device (4) comprising a classifier (40), which is used to form a first average value for a first class, for which the wind direction is positive and a second average value for a second class, for which the wind direction is negative. A difference is determined by means of a comparator and a calibration signal is emitted to the controller (8) of the pivoting device (11). The invention permits an autonomous calibration of the controller (8) for the tracking of the machine housing (12) and thus reduces the risk of an erroneous positioning of the rotor (14) in relation to the wind direction, irrespective of the prevailing wind conditions. The invention is particularly stable in relation to variable wind forces and directions, especially in the presence of gusts.
Owner:SENVION GMBH
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