Topic awaiting preservation: Starcube ;)

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didn't I see this floating about elsewhere?




...Of all the things I've lost, I miss my mind the most (ozzy osbourne)

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I don't know if it's the case with Java, but double-precision floating point performs the fastest on simple operations (+,-,*,/) on all i686 Linux boxes I've tested (using a small C program), and I assume it's the same in Windows since it's an architecture-based thing.

I don't know if it can be said the same of other hardware, but it seems that Intel has done a lot in speeding up souble-precision floating point operations to the point where they are ~15-20% faster than comperable integer arithmetic. Single-precision floating point is not the same way; however; and runs approximately equal to or slower than comparable integer arithmetic (presumably; it is cast to double point, the arithmetic is done, and then it is cast back to single precision; causing the slowdown).

And extended-precision is, uh, significantly slower than the rest, heh.

Oh, and by the way... http://www.rpi.edu/~laporj2/media/code/starsphere.html

"Any sufficiently advanced technology is indistinguishable from magic." -- Arthur C. Clarke
"Any sufficiently arcane magic is indistinguishable from technology." -- P. David Lebling

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pretty. both the cube and the sphere.

I'd be very suprised if the javavm wasn't using the processor's floating point unit if one is available (like on all intels since the 486) - platform independent byte code doesn't mean the vm can't make use of what the platform offers.

well, whatever you guys are going on about is over my head

all i know is that i'm on an old 233Mhz Pentium II and the sphere is all flashing and jerky.
but the cube is smooth as silk - if that means anything to yas

cool beans, InI

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Watch the bottom right area of the cube as it spins, do you see any points go lighter, or dissapear?

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I like surprises.

outcydr: Yes, it is quite slow on all but the latest hardware (it won't flash if you use MSIE, and it will run faster too... but only view it if you trust me to not encode viruses in my programs ). Javascript is much slower than Java; especially when it comes to rendering.

"Any sufficiently advanced technology is indistinguishable from magic." -- Arthur C. Clarke
"Any sufficiently arcane magic is indistinguishable from technology." -- P. David Lebling

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I'm apparently usin the same box as outcydr, 233 PII, and I get the same results.

I'm not opening IE for anything other than browsing my own HD. that's all

lookin good, keep working on all that cool 3d stuff and I'll keep working on that one program I started 3 years ago

l8er,




...Of all the things I've lost, I miss my mind the most (ozzy osbourne)

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More technically correct, but also about 3x slower (be warned): http://www.rpi.edu/~laporj2/media/code/starsphere3.html

Obviously based on your fun rose one.

"Any sufficiently advanced technology is indistinguishable from magic." -- Arthur C. Clarke
"Any sufficiently arcane magic is indistinguishable from technology." -- P. David Lebling

(Edited by Iron Wallaby on 07-24-2004 18:41)

Nice. Really nice.

There seems to be an inconsistency with the star transparency levels in relation to their distance/position. On the original cube it is most obvious in the lower right (as this is the edge of the field coming at you) and it seems that the stars are bright in the distance and have begun the return journey before they fade out and back. It causes an effect somewhat akin to blinking in the starfield and the transparency boundary appears to shift.

It is amazingly smooth. Have you created any more complex starfield shapes?

I can't help wondering what a figure picked out in your stars might look like, especially with the sliding transparency.

How about transitions from one shape to another?

Could you speed the whole thing up by making the shapes hollow? You could afford to increase the density of the outer surface of the shape perhaps, and apply details.

If you could make a hollow sphere, could you outline the continents of the globe in stars?

Sorry, I'll shut up now...

Actually, looking more closely now, it is that the stars are fading up, blinking out, then fading up again on the return journey to the foreground. They fade only once on the way out, then up twice on the way in (hence the blinking at the lower right).

The same thing may also be shared with the two motion-blurred cubes.

I hope I'm being helpful rather than insulting...

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That's cool (and remarkably, I understood ).

One last thing: Would it be possible to create an asymetrical 3D object which could then be rotated by the viewer?

I can see a lot of uses for your endeavours - good luck!

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Oo-er - I can't seem to load any of those applets now.

Yup, full 3D would be easy enough from there, but I'm interested to see the possibilities with starfields.

You see, I've seen a load of spinning cubes, spheres, and planes... but I've yet to see a model of the milky way! If you model it accurately enough, I might be able to point out the planet I come from...

Presumably, you can move the particles in relation to eachother to create animations too?

The applet won't load for me as well.

"Any sufficiently advanced technology is indistinguishable from magic." -- Arthur C. Clarke
"Any sufficiently arcane magic is indistinguishable from technology." -- P. David Lebling

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