public GraphDisplayOptionsBuilder defaultVertexShape(VertexShape vertexShape) {
		Objects.requireNonNull(vertexShape);
		displayOptions.setDefaultVertexShape(vertexShape);
		return this;
	}
Sets the default vertex shape for vertices that don't have a registered vertex type
@param vertexShape the {@link VertexShape} to use as a default
@return this GraphDisplayOptionsBuilder
Ghidra/Framework/Graph/src/main/java/ghidra/service/graph/GraphDisplayOptionsBuilder.java