by wacampbell » Sun Jan 03, 2016 4:02 pm
I am not familiar with the particular locomotive that you mention, but in general you cannot edit the mesh in a .GeoPcDx file. I know of two options for making changes:
1. To add items to a model, you build them in Blender and add them to the Engine Blueprint. For example, the new horn could be built and added as a Container Component to the Engine Blueprint.
2. For removing items, you may be able to 'alpha' them out. If the item happens to be rendered with an alpha shader, you can use the alpha channel of its texture to make it invisible. This is limited though as the item must be mapped to a unique area of a texture, not shared by other items. This isn't always the case. Also, if it doesn't use an alpha shader, in some cases you can change the shader name in the .GeoPcDx file to an alpha type, in order to do this.
Wayne
Wayne Campbell