Advanced Model Exporting

NOTE: This is not a guide for learning basic Blender or Quake .MDL exporting concepts.

Introduction

Nazi Zombies: Portable uses the standard Quake .MDL format for most of its props and other meshes. Specific to view models, however, it utilizes a special fork of the common io_mesh_qfmdl Blender export plugin, adapted to better support Blender 2.9X and contain features to mitigate vertex swimming. That forked export plugin can be found here.

New `Properties` for `.MDL` files in the NZ:P Exporter fork

Features

“First Frame” & “Last Frame”

Contrary to the vanilla export plugin’s usage of the playhead on the Blender timeline for frame selection, NZ:P’s fork utilizes Properties menu entries for determining the start and ending frames to be baked into the resulting .MDL. This is particularly useful for wanting to export precise chunks of animation data.

View Model “Bounding Box”

The NZ:P Ray Gun source file vs. a custom bounding box export. Note the absent arm outside of the bounding box.

The MDL Mins and MDL Maxs properties define a minimum and maximum region for vertices to cross over. The intended benefit of this is to only warp/swim vertices to their max point of camera visibility in order to preserve fine details such as weapon iron sights. Enabling Show MDL bounding box will give you a visual representation of this box to use as reference.

Custom bounding box with an active camera point of view

It is important to consider that bounding boxes need determined based on expected view model field of view. It is recommended to set up a Blender camera with the intended field of view and set it as active to get a live preview of how well your bounding box accomodates every frame you are intending to export.