Tunneling right through a Planet...

You can make an unbreakble piece of the ground thet covers the screen percisly and loops which in this case would be the core.(excuse my bad english)

 

NO BEDROCK! Nothing you can't dig through, just maybe to hot.

 

It would be really cool, but there's probably a lot of things that would get messed up if you tried to flip everything around after a while. You'd either have to make a whole system where the blocks get smaller as you go down (so you'd have to mine more and more and more blocks the further you go, slowly going to infinite blocks in the center, which would lag any computer and is probably really hard to code). Or there would have to be some kind of 2-sided flat system that loops to eachother, but that would be weird because you don't come out in the proper place on the other end. So I think we'll just have to do with a bedrock layer people. It's probably the only possible solution, as sad as that may be...

 

It would come out on the right end, though. If you were to dig a hole through a 2d earth, and then unravel it, making it this kind of world, the hole would come out halfway the flat planet away.

 

HOW ARE YOU DOING THESE UPSIDE DOWN LETTERZ

 

Well... suppose every planet has a portal core inside the core. Like the Tardis or Minecraft... and once you step into it it magically *pops* you back to a random place on the surface of said planet...

 

It's a secret blind sniper, don't ask google, whatever you do.
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I kept thinking about this and I think that for sufficiently large bodies in space, eg. planets, vehicles or suits would be necessary to travel into the planet beyond a certain point. Real factors include lack of air, heat and gravity. One would have to work to obtain the necessary materials to be able to get through the planet without getting killed. I still think that the diagram that I posted could work, it is a game after all and a bit of 'game logic' would not be game breaking.The only issue being, you couldn't dig around the core.

Vehicles or propulsion would solve the "I'm floating forever in the center of the planet" problem, and could add a progression to the game in the development of better and better vehicles/suits to go deeper and deeper.

With smaller bodies, eg asteroids and moons, with no liquid core, the requirement of having a vehicle would not be as strict.

I'd still vote that the camera flips once the center is reached so that 'up' would be the nearest direction to the surface. If it could be done smoothly, floating around in a hollow cavern at the center of a planet (maybe it's a dead planet) could be good fun.

 

There is 60-70km of crust, 3000km of mantle, 2500km of outer core and 1500km of inner core before you get to the centre. The deepest borehole drilled was less than 15km deep, hardly a 1/4 of the crust before the latest tech super hard Drillbit melted and gave way. The pressure at that depth is nearly 200,000kg per cm squared. There is no way you would be able to drill all the way to the centre of a planet without dying 1,000 times over. In teraria the depth of the whole map was about 5km from top to bottom. A proper planet is more like 8000km to the centre. It would take your whole life to dig to the propper centre of the planet so making it that big would be a waste and would lag out a supercomputer. Just make it that you die almost on contact with lava so once you get to the bottom of the crust you can't really go any further.

 

Make a FF7 core

 

Wat is ff7

 

A crisis core?

 

Wat that?

 

or the center could be a very rare and hard to get mineral and while you mine it the planet dies along with it

 

There is a way to allow digging through the core and popping out the other side (although it doesn't actually involve spherical gravity).

When the player reaches the bottom/core of the planet, do something like: player.x += planet.width/2.

If you have the same functionality as Terraria's Gravitation potion bulit in, you can get fancy and even draw the corresponding area, and then reverse their gravity when they cross the "boundary". If not, then the border of the screen could act as a loading screen and fade out and then back in with the player on the other side.

To borrow St Fonz' diagram, here's an illustration of two linked holes:

>LOOPSURFA----------ACESURFACESURFACESURFACES---------URFACESURFACESURFACESLOOP>
>LOOPEARTH---------EARTHEARTHEARTHEARTHEARTH---------EARTHEARTHEARTHEARTHLOOP>
>LOOPEARTH---------EARTHEARTHEARTHEARTHEARTH---------EARTHEARTHEARTHEARTHLOOP>
>LOOPEARTH---------EARTHEARTHEARTHEARTHEARTH---------EARTHEARTHEARTHEARTHLOOP>
>LOOPEARTH---------EARTHEARTHEARTHEARTHEARTH---------EARTHEARTHEARTHEARTHLOOP>
>LOOPEARTH---------EARTHEARTHEARTHEARTHEARTH---------EARTHEARTHEARTHEARTHLOOP>
>LOOPEARTH---------EARTHEARTHEARTHEARTHEARTH---------EARTHEARTHEARTHEARTHLOOP>
>LOOPEARTH---------EARTHEARTHEARTHEARTHEARTH---------EARTHEARTHEARTHEARTHLOOP>
CORECORECO----A---ECORECORECORECORECORECORE----B---RECORECORECORECORECORECOR

Fall in point A and you appear at Point B, and vice versa. Naturally measures would have to be taken to ensure players don't get stuck bobbing up and down at the boundary (possibly in the form of increased momentum each time the boundary is crossed).

Hope that all makes sense, as it would be an awesome thing to see implemented.