I guess that depends on what you mean by "...when the quality of the results of either method will be comparable..." :lol:.  Anyway, I'll leave that discussion until after some testing.

BTW, just an FYI (for future reference) I created a simple disc prop with 36 segments and wrote a little python script to see what the dot-products were (it's actually the cosine of the angle between the 2 rays), so this chart may come in handy:

Angle: 10 dot: 0.9848<br></br>
Angle: 20 dot: 0.9397<br></br>
Angle: 30 dot: 0.8660<br></br>
Angle: 40 dot: 0.7660<br></br>
Angle: 50 dot: 0.6428<br></br>
Angle: 60 dot: 0.5000<br></br>
Angle: 70 dot: 0.3420<br></br>
Angle: 80 dot: 0.1736<br></br>
Angle: 90 dot: 0.0000<br></br>
Angle: 100 dot: -0.1736<br></br>
Angle: 110 dot: -0.3420<br></br>
Angle: 120 dot: -0.5000<br></br>
Angle: 130 dot: -0.6428<br></br>
Angle: 140 dot: -0.7660<br></br>
Angle: 150 dot: -0.8660<br></br>
Angle: 160 dot: -0.9397<br></br>
Angle: 170 dot: -0.9848<br></br>
Angle: 180 dot: -1.0000<br></br>
Angle: 190 dot: -0.9848<br></br>
Angle: 200 dot: -0.9397<br></br>
Angle: 210 dot: -0.8660<br></br>
Angle: 220 dot: -0.7660<br></br>
Angle: 230 dot: -0.6428<br></br>
Angle: 240 dot: -0.5000<br></br>
Angle: 250 dot: -0.3420<br></br>
Angle: 260 dot: -0.1736<br></br>
Angle: 270 dot: 0.0000<br></br>
Angle: 280 dot: 0.1736<br></br>
Angle: 290 dot: 0.3420<br></br>
Angle: 300 dot: 0.5000<br></br>
Angle: 310 dot: 0.6428<br></br>
Angle: 320 dot: 0.7660<br></br>
Angle: 330 dot: 0.8660<br></br>
Angle: 340 dot: 0.9397<br></br>
Angle: 350 dot: 0.9848<br></br>

...of course 90deg == 0 and from there around to 270deg is a negative value (we knew that already)... but I thought that the other values might come in handy (it's not listed, but 0/360deg == 1.0).

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