Quote from PrejudicedNanobot on June 11, 2011, 10:13 pm

I believe only the orange and white chairs (the ones that also appeared in Portal 1) are physics props. However, you can force the other chair models to act as physics props if you use prop_physics_override entities when placing them in a map.

In order to enable prop_physics_override chairs to be picked up, you'll have to adjust their mass using the Mass Scale field, as they're all too heavy to be lifted by default (a model's associated mass is listed in the info tab when selecting an entity's world model). An object has to weigh 85 kg or less if you want the player to be able to pick it up.

Quote from Vordwann on June 11, 2011, 10:47 pm

GLaDOS: "Chairs?"

Wheatley: "I'm gonna go with... true... to that one..."

Quote from Marise on June 12, 2011, 9:03 am

I don't actually want the player to pick them up. I just want them to appear in game.

I did find one that shows up if I use it as a static model. chair_padded_office_1980. This will do for my current purpose, but I am curious why some don't seem to show up either as static or physics. In particular I was trying to use: props_motel/armchair.

Quote from Vordwann on June 12, 2011, 9:28 am

Have you tried making it dynamic just to see if it gets drawn like that?

Quote from PrejudicedNanobot on June 12, 2011, 11:13 am

I believe most of the Portal 2 chairs are meant to be used as prop_dynamic entities, so try Vordwann's suggestion of making them dynamic.

I agree that it's a bit strange that some of the chair models are static while others are dynamic and only one (as far as I know) is a physics prop. I found it rather disconcerting while playing the game.

Quote from taboo54 on June 12, 2011, 11:59 am

For future reference, you can always check the Info tab in the Model Browser to see what kind of prop the specific model can be

Quote from Marise on June 12, 2011, 6:39 pm

Thanks, everyone.