Interactive Camera and specular reflection

• Interactive Camera

Interactive camera is done. Now the camera position can be controled by keyboard input.
Keys:
      'W': move forward(in Z direction)
      'S': move backward(in Z direction)
      'A': move to left
      'D': move to right
      'U': up
      'I': down

•  Specular Relection

Specular not correct, still working on it.

Reflection not right：

Without reflection: