Material assignments allow defining per face or per object materials. In this interactive scripting session I show how materials, material properties and material assignments can be accessed. Next time I will expose a simple solution for exporting character animations.
Per face material assignments
For the record, material assignments are accessible from [buttons window > editing tab > Link and Materials panel. There's the usual up/down arrow to select an existing material or creating a new one. Although the actual material editor is elsewhere, you can still choose a color and a name for a material created here without exiting the editing tab. Upon creating / selecting a material, the current selection is assigned this material. Or you can select vertices later and use the 'Assign' button.
Interactive Scripting Session
This may not require additional comments:
bot=Blender.Object.Get("FunBot")
mesh=bot.getData(mesh=1)
faces=mesh.faces
# this will print the material index
faces[0].mat
# to find the name of a material
# get materials as an array
materials=mesh.materials
# this prints the name of the material assigned to face zero.
materials[faces[0].mat]
# this illustrates material properties
# (in interactive mode, prints material property values)
mat=materials[0]
mat.rgbCol
mat.amb
mat.alpha
math.hard/512
mat.specCol
mat.emit
Material.Get() can be used to get all materials in a scene - for an export script, however, it may be more efficient to map materials as we export geometry to avoid exporting unused materials.
Finally, there's an *awful* lot more about Blender materials in the Material API (link to Blender docs).
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