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World

aem1k.com

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Re: World

#63
post #34
post #33

Earlier quoted context omitted.

Movement is relative.

Only inertial movement. Turning is still absolute. (At least in special relativity.)

While rotation spoils an inertial reference frame, this certainly could be a representation of the view of the earth while from a typical (i.e. easterly) orbit. Short of adding an ASCII accelerometer or the like, there's no test you can do on it to demonstrate otherwise. The GP doesn't deserve downvotes any more than the other glib replies above.

Re: World

#64
post #50

Earlier quoted context omitted.

Doesn't look like the code is that similar. Doesn't look like copyright has anything to do with it. Does Endoh have a patent? That would of course be a different matter.

I'm not alleging a law was broken -- just that the author should have given credit for inspiration.

The author did give credit for the original in his presentation.

Re: World

#67

Earlier quoted context omitted.

Almost any kind of rotation in 2D or 3D graphics involves cos or sin. The spinning was going the wrong way, therefore the way to reverse it was to reverse something involving cos or sin. You can then just bruteforce it by reversing each cos until you get the effect you want. (If reversing cos seems to reverse something "perpendicular" to what you want, then you'd need to reverse the sin instead, not the cos.) This is…

I'd also note that in a point on the unit circle, cosine is the x coordinate and sine is the y coordinate. A good reason to try flipping a cosine first. See this: http://en.wikipedia.org/wiki/File:Unit_circle.svg (I still remember how people would describe trig in high school, it is a wonder more teachers didn't explain the cos = x, sin = y thing. Probably because my teachers did not understand math.)

My teachers did explain it that way. European school, if that matters.

Re: World

#68
post #67

Earlier quoted context omitted.

I'd also note that in a point on the unit circle, cosine is the x coordinate and sine is the y coordinate. A good reason to try flipping a cosine first. See this: http://en.wikipedia.org/wiki/File:Unit_circle.svg (I still remember how people would describe trig in high school, it is a wonder more teachers didn't explain the cos = x, sin = y thing. Probably because my teachers did not understand math.)

My teachers did explain it that way. European school, if that matters.

European school, if that matters.

Heh. Yeah, that matters.

In my experience, US highschools are very much "Okay class, today we're going to memorize these formulas."

Re: World

#70
post #17

It's spinning in the wrong direction!

This is one of the most beautiful pieces of art I've ever seen!

... and the top comment is typical negative nitpicking!

Why HN? Why?! There must be a better way!

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