オブジェクトに最寄りの頂点を返す #softimage

get_closest_point.py

def get_closest_point(geo, obj, near_by=1):
    '''return geo's vertex, that located closest obj position'''

    g = geo.ActivePrimitive.Geometry

    os_pos = get_local_positon_on_another(obj, geo)
    cs = g.GetClosestLocations([os_pos.X, os_pos.Y, os_pos.Z])
    pindex = g.GetPolygonIndexArray(cs)[0]
    closest_polygon = g.Polygons(pindex)

    t = []
    polygons = closest_polygon.NeighborPolygons(near_by)
    for poly in polygons:
        for p in poly.Points:

            x = abs(os_pos.X - p.position.X)
            y = abs(os_pos.Y - p.position.Y)
            z = abs(os_pos.Z - p.position.Z)
            sum = x + y + z
            t.append((abs(sum), p))

    return min(t)[1]


def get_local_positon_on_another(obj, ano):
    ''' return another object's local position of obj. '''
    ano_trs = ano.Kinematics.Global.Transform
    tmp = obj.Kinematics.Global.Transform
    po_pos = XSIMath.CreateVector3(tmp.PosX, tmp.PosY, tmp.PosZ)
    return XSIMath.MapWorldPositionToObjectSpace(ano_trs, po_pos)


def get_point_global_position(point):
    ''' return point(vertex)'s global positon. '''
    geo = point.Parent.Parent.Parent
    geo_trs = geo.Kinematics.Global.Transform
    return XSIMath.MapObjectPositionToWorldSpace(geo_trs, point.position)