**About the "Tribar"** (second part)

To construct a three dimensional object that leads to the original two dimensional image,
we start with **four** mutually orthogonal bars. The right yellow one has been cut off.

The most important part is to determine an orientation of the object in such a way that, when viewing the solid it seems as it has the form of a tribar. To determine this orientation, some rather elementary calculations are needed. Perhaps you can try it yourself. The two yellow bars have to be in a position as if they form just one bar. The reason why one of the yellow bars has been cut off is to obtain a smooth "junction" between the two yellow bars in the raytraced image.

Afterwards, we can rotate the object without any problem around an axis that is perpendicular to the image plane, but rotating it around any other axis gives unwanted effects.

All images have been raytraced using *PovRay* and the examples on the
Porrey 61 site helped me a lot to produce them.

return to the first part or return to my homepage

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Herman Serras, December 2004
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