Point Models

 
Built point models that can be ordered by head tracking software users if they, for some reason, don't wish to build their own point models are presented in this section. The fact that the models are built by hand indicates that the perfect quality of the product's surface, perhaps, shouldn't be expected, but the dimensions are correct, which provides for functionality. Each model has three tracking points, which means that head tracking with six degrees of freedom is provided for:

Battery Charged Model

Summary: 
This head tracking model contains three emitting IR diodes, which means that six degrees of freedom of the user's head movement can be related to the software, and it's charged by two 1.5 Volts batteries. It has been built according to Freetrack 2.1 specification, but it can be used with version 2.2 of Freetrack if the dimension of the model, visible on figure 1, are entered into the 2.2 version of the program. Alternately, those interested can download preset configuration files available at the bottom of this...

Reflective Model

Summary: 
The reflective model provides head tracking by reflecting the radiation emitted by the emitting IR diodes of the IR camera. As the figures show, this is achieved by gluing IR reflective tape over the tracking points on the point model. The absence of the need to power up the model itself represents an obvious advantage when compared to point models fitted with emitting IR diodes, but the problems with filtering out the ambiental radiation and unwanted reflections will increase. Aside from providing...

USB Charged Model

Summary: 
USB charged model has three emitting IR diodes the distances between which are, as figure 1 indicates, sized down by half in relation to what specifications for the corresponding model in version 1.1 of Freetrack suggest. Thus, this model is well suited for users who have their cameras positioned at distances shorter than one meter from their heads while using head tracking, because smaller dimensions of the model enable for greater movement of the user's head without running the risk that...

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