a specular examination的用法和样例：
- Vertex format includes a specular color component.
- He was glad that his trump card had had such a specular effect.
- The complete scene should be composed of a specular pass, a diffuse pass and an ambient pass.
- If you don't know what parallax mapping is, and don't need a specular map, skip this step completely.
- I use a specular map, reflexion map, and bump map(pictures below from left to right) for her skin, too.