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DarkBASIC Discussion / Find tilt on planet?

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TheComet
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Posted: 2nd May 2009 22:53 Edited at: 3rd May 2009 00:22
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Hello there!

I am experimenting with planetoid gravity (not for long) and can't figure out how to find the tilt on a planet, because there is no permanent "down" axis.

So, how can I find the tilt on a planet? Is it possible to do it with the return value from sparky's DLL "GetCollisionNormalDBC()", and if so, how?

EDIT : I want something like this : http://www.youtube.com/watch?v=VsSrA0ZcZhA&feature=channel_page

Thanks, TheComet

Peachy, and the Chaos of the Gems

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Link102
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Posted: 2nd May 2009 23:25
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From what I understand, you want a spacship to be pulled towards the center of a planet?
just find the angle of the planet toward the spaceship and move the spaceship x amount in the direction of that angle. where x = gravitational pull / distance.

look into magnet physics

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TheComet
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Posted: 3rd May 2009 00:21
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The magnet physics would be good for a planet, but I am heading more in THIS direction. The planet was just an example... Didn't quite explain that well...

TheComet

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Link102
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Posted: 3rd May 2009 13:54
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I don't really see where you're going. Do you mean the tube parts of the track as seen on 0 min 39 sec in the video?

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TheComet
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Posted: 3rd May 2009 14:53
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Yeah, pretty much that and the overall physics in F-Zero X.

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Link102
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Posted: 3rd May 2009 15:37 Edited at: 3rd May 2009 15:42
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well, I don't know the best method. It all depends on how you make your physics model and how you store / proces your track
As for the tube track;
- find the center of the trackpiece at your current location*.
- let the botom of the plane/car (how do you call one of those, never was a real fan of the series) point towards that point.
- also point gravity in that direction.
- if the car is at half thickness of the track, either push the car back by equal amount (normal force) or take away gravity. like I said, it all depends on how you make your physics model

* by current location I mean from begin to end not by x/y/z. like if you were 1st in the race, your location would be further than if your were 3rd.

edit:
what happens when you land upsidedown in that game?
and what happens when you race perpendicular to the round track, do you fly of or do you remain attached?

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TheComet
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Posted: 3rd May 2009 15:48
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I'll try what you said, thanks link102

Quote: "what happens when you land upsidedown in that game?"


You tip exactly to the angle of the track, even before landing.

Quote: "and what happens when you race perpendicular to the round track, do you fly of or do you remain attached?"


Your remain attached. I don't think you can fall off on that track.

TheComet

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Link102
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Posted: 3rd May 2009 17:01 Edited at: 5th May 2009 18:44
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Quote: "Your remain attached. I don't think you can fall off on that track."


that means fzero doesn't use exact physics. probably for the sake of gameplay.
It would be cool if you used a more exact physics model. like drag forces and gravity

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