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Curious question about extreme altitude values


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#1 kkolaja

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Posted 21 February 2018 - 03:43 PM

I was making my own course and accidentally entered the altitude as 13,500,000 (lol, cut and paste error on GPS XYZ coordinates).  Anyway, I loaded it and if I hit the ball, it would stay right in place and spin for several minutes until it finally would say xxx has hit it out of bounds.  Wondering what the physics model was going through at that altitude, did the ball go zooming off the terrain since its a zero atmosphere shot and would travel a long way but for some reason the screen wouldnt show the ball go in the air on screen?

 

anyway, curious (and I've fixed the altitude to back down to earth).



#2 jmk59

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Posted 21 February 2018 - 07:29 PM

Typical atmosphere models only go to a height of ~150,000 feet.  So depending on how PP coded the elevation part, it might be "capped" at 150,000, or an error value might be returned.

 

I've coded my own Sim model, so this is what would happen:

  • at the "cap" elevation, atmo. pressure and air density go to zero.
  • zero density means zero Lift and Drag forces.  only Gravity acting on the ball.
  • for the PP Driver acting under Gravity only - the carry would be 260 yds, but the max. height would only get to 13 yds.

So my guess is that PP's coding returns an Error, and the rest of their Sim doesn't know how to handle it.


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#3 ✠ davef ✠

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Posted 22 February 2018 - 01:31 AM

Typical atmosphere models only go to a height of ~150,000 feet.  So depending on how PP coded the elevation part, it might be "capped" at 150,000, or an error value might be returned.

 

I've coded my own Sim model, so this is what would happen:

  • at the "cap" elevation, atmo. pressure and air density go to zero.
  • zero density means zero Lift and Drag forces.  only Gravity acting on the ball.
  • for the PP Driver acting under Gravity only - the carry would be 260 yds, but the max. height would only get to 13 yds.

So my guess is that PP's coding returns an Error, and the rest of their Sim doesn't know how to handle it.

sounds like you need to be building this game.


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#4 jmk59

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Posted 22 February 2018 - 02:02 AM

Ah yes, perhaps.  Have you tried out some of my courses - they look like they were created by a sixth-grader with a box of broken crayons.

I'll stick to what I know.

Now I'm off to apologize to all the sixth-graders I just insulted.



#5 Buck

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Posted 22 February 2018 - 02:19 AM

Now I'm off to apologize to all the sixth-graders I just insulted.

 

We call ourselves "Forum Regulars"...

:D


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