week11

 (1)下載點線面程式

下載Source、data、win32、dll，用之前的方法解壓縮

(2)把source解壓縮zip裡面glm.h、glm.c、transfromation.c用notepad++來研究它

(3)把glm.h、glm.c、transfromation.c三個檔複製到桌面加上.cpp用codeblocks打開，並執行(如下圖)

4)親手寫出glm的程式碼,glmReadOBJ()讀入模型,glmDraw()畫出模型、加上打光的陣列、打光的函式、把模型轉到正面
#include <GL/glut.h>
#include "glm.h"///使用外掛
GLMmodel * model = NULL;///指標>>指到GLM的資料結構
///打光>>陣列裡有光的參數
const GLfloat light_ambient[]  = { 0.0f, 0.0f, 0.0f, 1.0f };
const GLfloat light_diffuse[]  = { 1.0f, 1.0f, 1.0f, 1.0f };
const GLfloat light_specular[] = { 1.0f, 1.0f, 1.0f, 1.0f };
const GLfloat light_position[] = { 2.0f, 5.0f, -5.0f, 0.0f };

const GLfloat mat_ambient[]    = { 0.7f, 0.7f, 0.7f, 1.0f };
const GLfloat mat_diffuse[]    = { 0.8f, 0.8f, 0.8f, 1.0f };
const GLfloat mat_specular[]   = { 1.0f, 1.0f, 1.0f, 1.0f };
const GLfloat high_shininess[] = { 100.0f };
void display()
{
    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
    if(model==NULL)
    {
         model = glmReadOBJ("data/Al.obj");///讀入模型
    glmUnitize(model);///怕模型太大太小，改成Unit單位大小-1..+1
    glmFacetNormals(model);///計算Facet的法向量s
    glmVertexNormals(model, 90);///計算vertex的法向量s
    }
    glPushMatrix();
        glRotatef(180,0,1,0);
        glmDraw(model, GLM_SMOOTH | GLM_MATERIAL);///畫
    glPopMatrix();
    glutSwapBuffers();
}
int main(int argc, char**argv)
{
    glutInit(&argc, argv);
    glutInitDisplayMode(GLUT_DOUBLE | GLUT_DEPTH);
    glutCreateWindow("week11親手打造的");
    glutDisplayFunc(display);

    ///打光的函式
    glEnable(GL_DEPTH_TEST);
    glDepthFunc(GL_LESS);

    glEnable(GL_LIGHT0);
    glEnable(GL_NORMALIZE);
    glEnable(GL_COLOR_MATERIAL);
    glEnable(GL_LIGHTING);

    glLightfv(GL_LIGHT0, GL_AMBIENT,  light_ambient);
    glLightfv(GL_LIGHT0, GL_DIFFUSE,  light_diffuse);
    glLightfv(GL_LIGHT0, GL_SPECULAR, light_specular);
    glLightfv(GL_LIGHT0, GL_POSITION, light_position);

    glMaterialfv(GL_FRONT, GL_AMBIENT,   mat_ambient);
    glMaterialfv(GL_FRONT, GL_DIFFUSE,   mat_diffuse);
    glMaterialfv(GL_FRONT, GL_SPECULAR,  mat_specular);
    glMaterialfv(GL_FRONT, GL_SHININESS, high_shininess);

    glutMainLoop();
}