Have you added a new armature deform modifier after applying the previous one?

Początkowo opublikowane przez Jpuffle5 the Penguin SFM:

Hiw does that add new flexes?

Refer to comments #7, #11, and #13 of this thread.

Początkowo opublikowane przez Jpuffle5 the Penguin SFM:

What do I do after I click Re-attach to Model?

Nothing.

Początkowo opublikowane przez Jpuffle5 the Penguin SFM:

I have a model that I have animated in SFM. I went back to fix some shape keys/flexes in Blender. If I recompile the model it will mess up past animations.

Refer to comment #5 of this thread.

Początkowo opublikowane przez Jpuffle5 the Penguin SFM:

I don't get how it finds the new ones.

The exact same way as if you were to spawn the model in a completely new session.

Początkowo opublikowane przez Jpuffle5 the Penguin SFM:

How will it find the new flexes?

It doesn't only look at what existing old controls would map to what current controls, it also brings in new controls that weren't there before.

Początkowo opublikowane przez Jpuffle5 the Penguin SFM:

Will this let me use the new flexes?

Yes.

Początkowo opublikowane przez Jpuffle5 the Penguin SFM:

What will that do?

Source FilmMaker doesn't say "okay, at this point, the bip_head bone is here", it says "okay, at this point, bone number 7 is here". It generates a list of user-friendly bone names for the user, which the bone numbers correspond correctly to.

The "Re-attach to model" thing then looks up what bone names are currently what bone numbers on the animationset, and then it re-generates the list for bone-name-to-number based on the current model, while moving the old bip_head's animation (maybe bone 7) to the new bip_head's animation (maybe bone 21 now).


In simpler terms, it looks at what used to be bip_head, then moves what is currently bip_head over there. The same goes for all other bones (and flexes).

Początkowo opublikowane przez Jpuffle5 the Penguin SFM:

I have a new problem. I am animating a whale in SFM, and if I replace the model files with the new ones, which have new shape keys/flexes, it disorts the animated model.

You can try right-clicking the model's animationset and choosing "Utilities" > "Re-attach to model" or such. Do keep a backup of the session, though.

As xDShot™ (on vacation) said, DMX models have flexes and flex controllers embedded inside them. And the way you tried to set up the flexes in the $Model command gets (almost) the exact same result as how the Blender Source Tools automatically implements flex controllers when using the "Simple" flex type for the DMX.

The only exception to that is that flex "decay" is enabled by default for VTA and disabled by default for DMX, but as that just makes flexes take some time to "settle in" (which also doesn't work right in Source FilmMaker when exporting a poster or switching to a new shot), that's likely something you don't want to have, anyway (especially considering you have "SFM" in your Steam user-name).