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prop_physics mass / weird behavior
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 Re: prop_physics mass / weird behavior
Posted by carpaltunnel on Sun Jan 2nd at 9:20am 2005

Hi all,

When I put a breakable wooden table or piece of furniture in the game, I use a prop_physics entity. Everything works fine except for one thing:

Certain ones, upon being hit or bumped, will fly up into the air with tremendous speed and then come down on you. There is one table that, if you bump it, it flies up in the air like this and then crushes you. It is really weird. I've used the same model in other rooms as a prop_physics and it works fine, so I don't think it's a static model or anything like that.

Is it the mass I should be tweaking? If so, does anyone here know the mass multiplier scale for common objects like tables, etc? I don't know if HL2 has a weird scale for masses, or if it's pretty straightforward units that it uses.





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 Re: prop_physics mass / weird behavior
Posted by Leperous on Sun Jan 2nd at 11:53am 2005

It might "know" the mass automatically from the material the prop is made from (metal/wood/etc.) and the volume, so entering 1 as the mass scale is probably a good idea.

Don't forget there is a "prevent motion enable on player bump" flag you can tick if you don't want the player knocking your props around!





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 Re: prop_physics mass / weird behavior
Posted by satchmo on Sun Jan 2nd at 5:12pm 2005

I would also double check the exact position of your flying-table in Hammer. Sometimes if you place the prop_physics entity slightly into another solid brush, it'll make the model get "pinched" in a brush, and according to real-life physics, it'll snap on you when it's distrubed (kinda like a mouse trap).

I had a table that always spawnned overturned because I had a corner of it extending into another model (a chair). When I increased the distance between these models, all is well.
[addsig]



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 Re: prop_physics mass / weird behavior
Posted by Livett on Mon Jan 3rd at 12:06pm 2005

? quoting carpaltunnel
it flies up in the air like this

Saying 'like this' doesn't help... we can't see it





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 Re: prop_physics mass / weird behavior
Posted by carpaltunnel on Mon Jan 3rd at 9:20pm 2005

"will fly up into the air with tremendous speed and then come down on you" <---- like THIS

yeah, the ground was "pinching" the props... moving them 1 unit away got rid of the problem






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