Sets the material's specular color, in the standard OpenGL lighting model.
Use the CoglSnippet shader api for lighting
The intensity of the specular color depends on the viewport position, and is brightest along the lines of reflection.
The default value is (0.0, 0.0, 0.0, 1.0)
| this |
A |
| specular |
The components of the desired specular color |