如何设置光线和材质以获得翡翠物体

Question

当我在 opengl 中为对象 (glutSolidSphere(2.,10.,8.);) 设置 material 时，例如翡翠参数：

 float[] mat_ambient ={ 0.0215f, 0.1745f, 0.0215f, 0.55f };
 float[] mat_diffuse ={0.07568f, 0.61424f, 0.07568f, 0.55f };
 float[] mat_specular ={0.633f, 0.727811f, 0.633f, 0.55f };
 float shine = 76.8f;

为了获得真正的翡翠物体，我应该以同样的方式设置光的成分吗？我的意思是：

float[] light_ambient ={ 0.0215f, 0.1745f, 0.0215f, 0.55f };
float[] light_diffuse ={0.07568f, 0.61424f, 0.07568f, 0.55f };
float[] light_specular ={0.633f, 0.727811f, 0.633f, 0.55f };

浮动[] light_position= { 1.0, 1.0, 1.0, 0.0 };

结果不好...

Answer 1

如果你想用Blinn–Phong reflection model and Gouraud shading you have found the answer. However, you can't do anything more realistic with the 20-year-old OpenGL Fixed-Function pipeline. Same reason as in the comments on your previous question How can I do a brass surface?渲染一个绿色表面。
与 Phong shadding where it is computed per fragment. Use a higher resolution on the sphere to improve lighting and get some specular highlights. See GLSL fixed function fragment program replacement and .

相比，使用 Gouraud 着色时，灯光模型是按顶点计算的