Added blender2ogre and mesh pipeline instructions

.gitmodules

@@ -10,3 +10,6 @@
 [submodule "Dependencies/tracy"]
 	path = Dependencies/tracy
 	url = https://github.com/wolfpld/tracy
+[submodule "Dependencies/blender2ogre"]
+	path = Dependencies/blender2ogre
+	url = https://github.com/OGRECave/blender2ogre

Dependencies/blender2ogre

@@ -0,0 +1 @@
+Subproject commit fd15a2d46be120354ffaee98f978c40de81a6c9d

ReadMe.org

@@ -24,9 +24,28 @@ Build:
 
 * Asset pipeline
 This is a work in progress.
+** Blender setup
+- Install [[https://www.blender.org/][Blender]]. I can confirm Blender 2.91 works.
+- Copy ~blender2ogre~ to Blender plugins:
+#+BEGIN_SRC sh
+cp -r Dependencies/blender2ogre/io_ogre/ ~/.config/blender/2.91/
+#+END_SRC
+- Open Blender, then open Preferences (Edit->Preferences), and click Add-ons
+- Search for "Ogre" and check the box to enable the OGRE Exporter
+- Build Ogre, if you haven't already (run ~BuildDependencies_Debug.sh~)
+- Set ~OGRETOOLS_XML_CONVERTER~ to where you built OgreMeshTool. You'll need to browse to ~gamelib/Dependencies/ogre-next/build/Debug/bin/OgreMeshTool_d~
+
+You are now ready to export. Open your model or create one, then do ~File -> Export -> Ogre3D~. See the following section for settings. /Note:/ I will be making command-line driven auto-exporting to reduce these manual steps.
+** OGRE Export Settings
+- Don't *export materials*. These are v1 materials as far as I know, which don't work with Ogre 2
+- Don't *export scene*. I don't use these files
+- Ensure *mesh export version* is set to ~v2~
+** Converting ~.mesh.xml~ to ~.mesh~
+You shouldn't need to do this step if you set ~OGRETOOLS_XML_CONVERTER~, but in case blender2ogre didn't recognize it, here's how I worked around it:
 
-For me:
 #+BEGIN_SRC sh
-cd ~/Development/code/repositories/gamelib/Dependencies/ogre-next/build/Debug/bin
-./OgreMeshTool_d -e -O puqs ~/Development/code/repositories/gamelib/test/data/Models/Suzanne.mesh.xml
+cd Dependencies/ogre-next/build/Debug/bin
+./OgreMeshTool_d -e -O puqs ../../../../../test/data/Models/Suzanne.mesh.xml
 #+END_SRC
+
+Run this after you've made an attempted export from the Blender OGRE plugin.