primitives.py 文件源码

def _create_mesh(self):
        log.debug('Creating mesh for box primitive')
        box = self._unit_box
        vertices, faces, normals = box.vertices, box.faces, box.face_normals
        vertices = points.transform_points(vertices * self.box_extents, 
                                           self.box_transform)
        normals = np.dot(self.box_transform[0:3,0:3], 
                         normals.T).T
        aligned = windings_aligned(vertices[faces[:1]], normals[:1])[0]
        if not aligned:
            faces = np.fliplr(faces)        
        # for a primitive the vertices and faces are derived from other information
        # so it goes in the cache, instead of the datastore
        self._cache['vertices'] = vertices
        self._cache['faces']    = faces
        self._cache['face_normals'] = normals