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2/ Shapes designation
I defined three principal parameters; F, F1, F2, (shapes titling n°21) for the TRA family which expressed the frequency, as for the previous CSM and CUB families. In general, the higher the frequency, more numerous are the triangles in the form. As the form is divided into many zones depending on the frequencies, when these same frequencies are varied, zones can consequently be stretched or compressed.
As each of these forms lie on a plane, by making it symmetrical in relation to this plane, a closed form is obtained possessing two orthogonal symmetrical planes. In this way, this new closed volume can also be cut according to its two orthogonal symmetrical planes. So one closed volume generates two volumes lying on perfect planes.
These two forms coming from the same closed volume had to be distinguished by different names. I thus adopted the name of the general form followed by Y or Z according to the axis which goes through it at the higher part. And so the two declinations of general form 12-4-3 become 12-4-3-Y, 12-4-3-Z .
I defined three principal parameters; F, F1, F2, (shapes titling n°21) for the TRA family which expressed the frequency, as for the previous CSM and CUB families. In general, the higher the frequency, more numerous are the triangles in the form. As the form is divided into many zones depending on the frequencies, when these same frequencies are varied, zones can consequently be stretched or compressed.
As each of these forms lie on a plane, by making it symmetrical in relation to this plane, a closed form is obtained possessing two orthogonal symmetrical planes. In this way, this new closed volume can also be cut according to its two orthogonal symmetrical planes. So one closed volume generates two volumes lying on perfect planes.
These two forms coming from the same closed volume had to be distinguished by different names. I thus adopted the name of the general form followed by Y or Z according to the axis which goes through it at the higher part. And so the two declinations of general form 12-4-3 become 12-4-3-Y, 12-4-3-Z .