Costly collision model

A costly collision model is one with over 20 convex parts. You will receive this error when going over it:

WARNING: COSTLY COLLISION MODEL!!!! (30 parts - 20 allowed)
WARNING: Error with convex elements of myfirstmodel-phys.smd, building single convex!!!!
Model has 31 convex sub-parts
Collision model completed.

The appearance of "error with convex elements" is itself an error, so ignore it. Your meshes are (probably) fine.

Solution for ep2

Either try to decrease the number of convex meshes, or if you really do need that many of them (usually only excusable on very large models), to use the $maxconvexpieces command to override the limit to one of your own preference. For instance:

$collisionmodel	"myfirstmodel-phys.smd" { $concave $maxconvexpieces 30 }

Solution for ep1

Episode One engine users must run studiomdl with the -fullcollide parameter when compiling instead.

Open a text editor and copy and paste the following code in

@echo on

cd "%sourcesdk%\bin\ep1\bin\"

studiomdl.exe -fullcollide %1

@pause

Save the text file, for example, as fullcollide.bat (make sure it's really a .bat file and not a .txt file)

After that, place fullcollide.bat into the same folder as your .qc file and drag and drop the .qc file onto the batch file, truncating will be disabled now.