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AppGameKit Classic Chat / Mapping 2D physics to 3D objects

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_Pauli_
AGK Developer
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Posted: 3rd Aug 2014 20:29
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Hi,

how do I map 2D physics to 3D objects?
I'm sure somebody has done this for some kind of 2.5D game. I want to run a Box2D simulation and apply the positions and rotations of objects (invisible dummy sprites) to 3D objects for the visual output. But somehow I can't really get it to line up perfectly.

I've searched around here but couldn't find the answer. I've read that there is somekind of snippet by baxslash that does something similar, but I couldn't find it.

Any help or hints are greatly appreciated!

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Marl
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Location: Bradford, UK
Posted: 3rd Aug 2014 21:04
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Yeah, the only one I remember was the one from Bax.

Wasn't it published in one of the newsletters?
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_Pauli_
AGK Developer
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Posted: 3rd Aug 2014 21:08
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Yeah, I just found the snippet in the ADG Newsletter 12. I'm checking that out now...

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lilpissywilly
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Posted: 3rd Aug 2014 21:29
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Give a shout if you still need an example of this, I've posted a few.

My hovercraft is full of eels
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_Pauli_
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Posted: 5th Aug 2014 08:56 Edited at: 5th Aug 2014 08:57
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Ok,
here's an important reminder: Keep an eye on your sprite offsets while transforming 2D to 3D, especially when working with polygonal collision shapes!

Many of my coordinates got messed up because of this and it wasn't until I set all sprite offsets to 0, 0 that the two worlds lined up perfectly.
I lost quite a bit of nerves about this since I got the simple principles working in the first place but couldn't see where the offsets were coming from.

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swissolo
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Posted: 5th Aug 2014 17:29
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I wrote a bunch of functions that managed 2D physics for 3D objects automatically and built a game around it, but people didn't seem very interested. Make sure to watch out where you update the coordinates. You should be splitting up the sync() command

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