During the OpenFlight User Group Meeting at I/ITSEC on 11/30/2011, tips and tricks were presented for using OpenFlight Script and Creator Script.

Here is a script presented that shows how to use the little known API function mgFind in your Creator Script to select nodes to process (in this case by the Calculate Shading command).

# this walk function for mgFind is used to select
# just polygons that are "flat" shaded 
def IsUnshadedFace (db, parent, node, userData):
    if (mgGetCode(node) == fltPolygon):
        num,code,mode = mgGetAttList (node, fltGcLightMode)
        if (mode == 0):
            # tell mgFind to include this node in the list it returns
            return MG_TRUE
    # tell mgFind to NOT include this node in the list it returns
    return MG_FALSE

db = mgGetCurrentDb()
# use mgFind to build a node list, according to IsUnshadedFace
# only polygons that are "flat" shaded will be included in the list
faceList = mgFind (db, IsUnshadedFace, None, 0)

# select all the "flat" shaded polygons found
mgSelectList (faceList)

# now invoke Calculate Shading to shade the "flat" shaded polygons
paramBlock = mgGetParamBlock ("Calculate Shading")
mgParamSet (paramBlock, "Angular Tolerance", 89)
mgParamSet (paramBlock, "Sampling Tolerance", 0.01)
mgParamSet (paramBlock, "Shading Model", "Lit")
mgParamSet (paramBlock, "Triangle Area Weighting", MG_FALSE)
mgParamSet (paramBlock, "Update Vertex Colors", MG_TRUE)
mgParamSet (paramBlock, "Update Vertex Normals", MG_TRUE)
mgParamSet (paramBlock, "Use Face Color Intensities", MG_TRUE)
mgExecute ("Calculate Shading", paramBlock)