Need to write a WebGL 1.0 shader code to render Silhouette edges. -- 2

Need to write a WebGL 1.0 shader program to render Silhouette edges of the model. Prototype of the WEBGL viewer code will be provided. Need to modify the provided shader code to detect the Silhouette edges and render it. Work need to be completed within one or two [login to view URL] the project is accepted WEBGL viewer code will be provided.