Electronics > Projects, Designs, and Technical Stuff
Home Brew Analog Computer System
GK:
Hmmm......... looks interesting. However if I am restricted to the 8-bits of a typical digital pot there really isn't any point in attempting to rotate my isometric projection in steps of finer resolution than 1 degree. The full sine/cosine lookup table (0-90 degrees) is therefore only 182 bytes and for simplicity can hardly be beat.
An 8-bit approximation (rounding down to the nearest integer) doesn't seem to be quite that bad or excessively chunky for the most part after all:
chickenHeadKnob:
Ya, for 8 bits out there is no sense going beyond straight lookup. Due to symmetry in the trigonometric functions you can further compress the domain to 0 - 45 but beyond that it isn't worth the effort.
GK:
BTW, here is the Lorenz Attractor in isometric projection. The angles of rotation on both the X and the Y axis are still fixed at 45 degrees (by a fixed resistor sin/cos matrix) as I haven't ordered my digital pots yet. Some boof heads require Matlab to produce a display like this ::) I do it with op-amps and a Tek545 ;D
I'll make a video of the display when I get my sin/cos synthesized digital pots wired into the transformation circuit. It will look pretty cool when I can twiddle a pair of pots to fully manually rotate the projection on both axes.
baljemmett:
--- Quote from: GK on June 29, 2013, 02:14:00 am ---Some boof heads require Matlab to produce a display like this ::) I do it with op-amps and a Tek545 ;D
--- End quote ---
Oh, very nice work, sir! A thumbs up is definitely in order ;)
megajocke:
Cool! Nice progress O0
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