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Author Topic: One occupant made an instant movement and then got stuck  (Read 4415 times)

liu_zhen

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One occupant made an instant movement and then got stuck
« on: March 02, 2009, 01:03:23 am »

When I was doing a simulation similiar to the one in IMO guidelines, one occupant suddenly made an instant movement and then got stuck.

I made a movie recoding that "flying" process, but the file size is too big for the forum attachment requirement.
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Charlie Thornton

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Re: One occupant made an instant movement and then got stuck
« Reply #1 on: March 02, 2009, 08:38:28 am »

Can you attach the PTH file for the simulation?  With the PTH file, we can re-run the simulation with our debugging tools.

- Charlie
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liu_zhen

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Re: One occupant made an instant movement and then got stuck
« Reply #2 on: March 02, 2009, 10:59:01 pm »

Hi Charlie,

I am afraid that my pth file is too big to be attached on the forum, so
I send you by email. Hope this mail can find you.
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Charlie Thornton

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Re: One occupant made an instant movement and then got stuck
« Reply #3 on: March 03, 2009, 09:13:18 am »

Thank you for emailing me the PTH file.  That "instant movement" was impressive.  The occupant is catapulted from a lower stairway into one of the upper rooms.  The good news is,  I can only reproduce this bug using the current public beta - in our development build the simulation runs successfully.  The bad news is, we haven't fixed anything that would specifically address this problem.  Richard is going to revert his code to match the current beta and see if he can figure out what was happening.

I'm going to look into the size of our PTH files.  500k seems too big for a model that doesn't contain imported data or background images.

- Charlie
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Richard O'Konski

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Re: One occupant made an instant movement and then got stuck
« Reply #4 on: March 03, 2009, 02:16:53 pm »

We've looked into this problem and found that there was a bug calculating the actual velocity of occupants for each time step.  We hadn't seen it in any of our testing, but it crept up in your simulation.

What happened was that the velocity was exponentially increasing past the maximum velocity of the occupant.  He couldn't slow himself down, and so he was actually zipping around in the model rediculously quickly.  He eventually gets stuck in a corner of a room because he was moving so fast relative to the time step that he couldn't navigate through the door and out to the exit.

The fix will be in the next release, which should be tomorrow.
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Richard O'Konski
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liu_zhen

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Re: One occupant made an instant movement and then got stuck
« Reply #5 on: March 04, 2009, 10:11:11 pm »

Glad to see the new release.
But when I tried to download it, the download link seems to be not correct.

And can the case file created in the old version be compatible in the new one?
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Charlie Thornton

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Re: One occupant made an instant movement and then got stuck
« Reply #6 on: March 05, 2009, 09:26:12 am »

Well, that's embarrassing.  I've fixed the link.  Thanks for the heads up.  I'll probably announce the release later on today.

The new version can open files created with old versions. (but not the other way around)
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