Timeline for What are the maths behind 'Raiden 2' purple laser?
Current License: CC BY-SA 3.0
24 events
| when toggle format | what | by | license | comment | |
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| May 30, 2012 at 21:33 | history | edited | aybe | CC BY-SA 3.0 |
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| May 26, 2012 at 15:51 | history | edited | aybe | CC BY-SA 3.0 |
update
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| May 26, 2012 at 15:46 | history | edited | aybe | CC BY-SA 3.0 |
update
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| May 24, 2012 at 12:18 | comment | added | Hackworth | @Aybe I meant radical of this sort: drmcninja.com/archives/comic/23p40 | |
| May 23, 2012 at 23:22 | history | edited | aybe | CC BY-SA 3.0 |
new test
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| May 23, 2012 at 23:14 | history | edited | aybe | CC BY-SA 3.0 |
new test
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| May 23, 2012 at 22:16 | comment | added | aybe | @tigrou Very interesting, I'll give it a try. | |
| May 23, 2012 at 22:14 | comment | added | aybe | @Byte56 I'm on it ! | |
| May 23, 2012 at 22:12 | comment | added | tigrou | I agree with Byte56 for possible curve algorithm but something more simple than bezier curve would also be ok (no need of control points). I was thinking about cubic interpolation. Have a look here : local.wasp.uwa.edu.au/~pbourke/miscellaneous/interpolation. Page link also give one interpolation algorithm (hermite) that give possibility to configure tension/bias. It would give more bending to the curve and maybe changing it runtime would give same "shaking effect" as seen on video. | |
| May 23, 2012 at 22:10 | comment | added | aybe | @Hackworth Can you tell more about using radicals for this purpose ? | |
| May 22, 2012 at 19:55 | answer | added | Doug.McFarlane | timeline score: 6 | |
| May 21, 2012 at 23:31 | comment | added | House | @JoeWreschnig No, not closed form. It could be either linear increments or sprites placed along a open-ended spline. Would be interesting to know. Let us know what you come up with Aybe. | |
| May 21, 2012 at 23:14 | history | tweeted | twitter.com/#!/StackGameDev/status/204711886221099008 | ||
| May 21, 2012 at 23:07 | comment | added | aybe | Thanks for your comments, I still have to code something, will post it here then. | |
| May 21, 2012 at 22:48 | comment | added | user744 | Also, much of the snapping is not (necessarily) an over-fitting artifact, but the result of enemies quickly appearing and then dying. Well, I guess this gives me an excuse to play a bunch of Raiden tomorrow. | |
| May 21, 2012 at 22:47 | comment | added | user744 | @Byte56: Do you mean you think they're solving it as a closed-form equation? When done with discrete sprites like that, an object seeking another in linear increments would be visually identical to any number of spline-based methods. (The only thing distinguishing a spline from a series of connected line segments is continuity at the knots, which discrete sprites would entirely mask the presence/absence of.) | |
| May 21, 2012 at 22:36 | comment | added | House | @JoeWreschnig Good point, also your pathing idea is good too. However, I still think spline based on that "snapping" it does. | |
| May 21, 2012 at 22:36 | comment | added | Kevin Reid | Looks like it places segments one at a time proceeding out from the ship, with a maximum bend, and each segment either turns towards enemies if any are nearby or in the direction of the ship's movement. | |
| May 21, 2012 at 22:33 | comment | added | user744 | @Byte56: Shmup devs/fans are dedicated, I would be surprised if this isn't documented / reverse engineered somewhere by now. | |
| May 21, 2012 at 22:27 | comment | added | user744 | Having played an unhealthy amount of Raiden, I have my doubts the toothpaste is any kind of closed form curve. It always seemed to keep a fair amount of memory. I suspect it's doing some kind of pathing with a mandatory turn radius. | |
| May 21, 2012 at 22:26 | comment | added | Hackworth | No idea, but it's got a fine of amount of radical to it. | |
| May 21, 2012 at 22:22 | comment | added | House | Well, it's a spline of some kind. Possibly Bézier Curve. I'm not sure if this question is answerable by anyone other than the original developers. If you're trying to re-create this effect you should show us what you have and tell us what about it isn't working. | |
| May 21, 2012 at 22:10 | history | edited | House | CC BY-SA 3.0 |
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| May 21, 2012 at 22:07 | history | asked | aybe | CC BY-SA 3.0 |