mirror of
https://github.com/OpenMW/openmw.git
synced 2025-10-27 03:26:38 +00:00
99 lines
3.7 KiB
ReStructuredText
99 lines
3.7 KiB
ReStructuredText
#################################
|
|
Blender to OpenMW with OSG native
|
|
#################################
|
|
|
|
This article explains how to export a model from Blender to OpenMW using the OSG model format. It supports only basic, static models.
|
|
For more details on the format, refer to `this forum post <https://forum.openmw.org/viewtopic.php?f=20&t=2949&p=35514#p35514>`_.
|
|
|
|
Prerequisites
|
|
#############
|
|
|
|
- OpenMW 0.38 or later
|
|
- Blender 2.60 or later
|
|
- OSG exporter add-on for Blender
|
|
- A Blender model you would like to export
|
|
|
|
Installing the exporter
|
|
#######################
|
|
|
|
#. Download the
|
|
`OSG export script
|
|
<https://github.com/openmw/osgexport/blob/release/blender-2.5/build/osgexport-0.14.2.zip?raw=true>`_
|
|
#. Open Blender and go to File -> User Preferences
|
|
#. Select Add-ons -> Install from File, then select the downloaded `.zip`
|
|
#. Enter "osg" into the search bar, then tick the checkbox next to the add-on to enable it
|
|
#. Now click Save user setting so the exporter stays enabled when you re-start Blender
|
|
|
|
You can now export your models using the OSG model (osgt) entry in the File -> Export menu.
|
|
|
|
Model's location
|
|
################
|
|
|
|
The model needs to be at 0,0,0 coordinates in Blender,
|
|
as this is where its origin will always be when exported.
|
|
If the model is offset from 0,0,0 in Blender,
|
|
it will be offset from its origin in the exported file as well.
|
|
|
|
Model's rotation
|
|
################
|
|
|
|
- Blender's Z axis is up axis in OpenMW
|
|
- Blender's Y axis is front axis in OpenMW
|
|
- Blender's X axis is left-right axis in OpenMW
|
|
- Visual rotation is taken into account when exporting
|
|
|
|
Model's scale
|
|
#############
|
|
|
|
Blender:OpenMW model scale is 70:1,
|
|
which means 70 Blender units (BU) translate into 1m in OpenMW.
|
|
Using this scale, any models you make will fit with the existing ones.
|
|
The scale does not need to be applied,
|
|
the exporter will always use the visual scale of the model.
|
|
However, 70 is an odd number to work with so here's an alternative workflow:
|
|
|
|
- In Blender, use a scale of 1BU = 1m which is a nice scale and ratio to work with.
|
|
Have all models use this scale.
|
|
- Before exporting a model, scale it up by a factor of 70.
|
|
- After exporting, undo the model's scale change and continue working as normal
|
|
(in the future a preferable way would be to apply the scale through the exporter)
|
|
|
|
Putting the model in-game
|
|
#########################
|
|
|
|
Place the exported model in the Meshes sub-folder of a data folder recognized by the game,
|
|
e.g. the Morrowind Data Files folder, or the local data folder.
|
|
Place all required textures in the Textures sub-folder.
|
|
Now start OpenMW-CS, create a new addon file
|
|
and you should see your mesh in the Assets -> Meshes table.
|
|
Go ahead and make some object use your mesh.
|
|
You can now preview by right clicking on the object -> Preview to see what the mesh will look like.
|
|
|
|
Converting the model to binary
|
|
##############################
|
|
|
|
When the model behaves to our liking,
|
|
we can think about converting it from the "osgt" text format to the "osgb" binary format
|
|
so that it's smaller in size - and thus faster to load.
|
|
|
|
To do this, simply invoke the osgconv tool.
|
|
This tool should be included with your distribution of OpensceneGraph.
|
|
|
|
`osgconv -O WriteImageHint=UseExternal model.osgt model.osgb`
|
|
|
|
Of course, you can convert the binary model back to text format as well:
|
|
|
|
`osgconv -O WriteImageHint=UseExternal model.osgb model.osgt`
|
|
|
|
Note the use of `-O WriteHint=UseExternal` option.
|
|
Enabling this option is desirable because it keeps the textures as external file references,
|
|
rather than embedding the textures within the model file.
|
|
Embedded textures have disadvantages such as being hard to inspect,
|
|
and impossible to share between model files.
|
|
|
|
Using shaders/normal maps
|
|
#########################
|
|
|
|
See :ref:`OSG Native Files`
|
|
|
|
|