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Technical Question On Collision Models


Ishtvan

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I love how writing sound propagation code leads me to post uninformed questions in so many other development forums...

 

Anyway, I have to load a collision model for doors early on in my code, and I have a choice about whether to let it go ahead and use the rendermodel as the collision model if no .cm file exists for the model, or give an error at this point about the door not having a .cm file. I don't know how you guys make collision model .cm files, maybe they're automatically generated from SURF_COLLISION surface when importing the model? I dunno.

 

I'm inclined to just do what D3 does when it loads collision models, which is try to find the .cm model, and if not, use the rendermodel. Because maybe you guys like to use SURF_COLLISION in your models themselves rather than generating a separate .cm file? I just wanted to check what you modelers' preferences are.

 

As a side note, if I'm reading the code right, for a collision model to be precached on map load, the model files MUST include a .cm file, otherwise it's dynamically loaded from the rendermodel every time an entity using that rendermodel needs a clipModel (which I would think would be bad). So that may be one argument for making .cm files.

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  • 2 weeks later...

This is from Bloodrayne on D3World on creating collision models, in case anyone does not know this:

 

Create a new blank map, then import [Your model] into Doomedit. Now go to 'selection/export to cm' and export as .cm file (just select the .ase file it will automatically create the CM). No put that CM file in the same directory as the .ase model...

 

Hopefully it also works with .lwo models.

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I asked Brian about this a couple weeks ago:

 

He said the collision model loader will use either the .cm file, brushes with COLLISION texture or whatever it is, or if it can't find those it will use the rendermodel.

 

HOWEVER, collision models are precached on map init. He said that when precaching, the collision model will NOT be loaded if it does not have a .cm file. So I'm not sure what is happening in our case. They obviously can't be precached if there's no .cm file; maybe it's dynamically loading some from the rendermodel, and not doing that for others. I don't know.

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