Nudging first created 06/12/08 - last modified 06/12/08 Page Author: Ty Harness
Nudging

Work in progress Nudging is an experimental technique applied to STOR211beta - It's not fully tested and you should only use this for testing purposes.

When you use the square off central axis option you cannot define the 3 rotations to describe the circle end as they are calculated automatically. The programs choice of where to start the triangulations of the pattern can be ill conditioned leading to points of inflexion in the pattern curve (describing the circle end) and/or kinks in the transformer even though the circle is orientated correctly. Figures 1 and 2 shows nudge the circle nudged around using divisions. The more divisions the finer the nudge and you can nudge positive anticlockwise or negative clockwise. This is the same as using RZ when specifying a compound angle but it's not and angle measurement like RZ unless you calculate it: nudgeAng = (nudge x 2PI)/N

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Figure 1 - Square off central axis Nudge +1




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Figure 2 - Square off central axis Nudge -2


Again the idea behind nudging is to improve the pattern and the final transformer. Using the nudge for figure1 and 2 will have a detrimental effect on the pattern. Figures 3 and 4 show when nudging is beneficial when the compound offsets OX and OY are needed in the design.

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Figure 3 - Nudge = 0 produces an ill-conditioned pattern




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Figure 4 - Nudge = -3 produces a well-conditioned pattern



The corresponding face normals are the best way to determine the nudge and figures 5 and 6 show the 0 and -3 nudges respectively.

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Figure 5 - Nudge = 0 Extreme kinking - Not worth attempting to make this transformer




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Figure 6 - Nudge = -3


Note even a nudge of -3 still produces slight kinking, but you can overcome this by choosing more divisions of the circle.

Figures 7,8 and 9 show that the circle end is orientated correctly but if an imaginary cylinder was to continue through to the 0,0,0 origin (i.e. along the central axis) then you can see the break out in nudge 1 figure, but the nudge 2 figure shows a nice looking transformer.

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Figure 7,8,9 - The difference in nudging.


Nudging is nothing special because if you developing these transformer manually you'd just choose the best placement of the 4 big triangles.




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