week11

讀入OBJ檔

▲下載source檔案，並將三個並將三個檔案放入自己的專案裡面
▲需要將glm.c改名成glm.cpp檔
▲將3個檔案匯入即可開啟自己的transformation範例檔了

使模型打光

#include<GL/glut.h>

#include "glm.h"

GLMmodel * model=NULL;

//打光的第0步,宣告陣列,裡面有光的屬性值

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, 3.0f, -5.0f, 0.0f };///照光方向數值

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 };

float angle = 0;

void display()

{

    glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);

    if(model==NULL){

        model = glmReadOBJ("data/Al.obj");

        glmUnitize(model);

        glmFacetNormals(model);

        glmVertexNormals(model,90);

    }

    glPushMatrix();

        glRotatef(180,0,1,0);

        glRotatef(angle,0,1,1);

        glmDraw(model,GLM_SMOOTH|GLM_MATERIAL);

    glPopMatrix();

    angle++;

    glutSwapBuffers();

}

int main(int argc,char**argv)

{

    glutInit(&argc,argv);

    glutInitDisplayMode(GLUT_DOUBLE|GLUT_DEPTH);

    glutCreateWindow("Myself");

    glutDisplayFunc(display);

     ///打光也需要 3D的 depth test

    glEnable(GL_DEPTH_TEST);

    glDepthFunc(GL_LESS);

    ///打光1:要開啟光線, 原來範例就寫好了

    glEnable(GL_LIGHT0);

    glEnable(GL_NORMALIZE);

    glEnable(GL_COLOR_MATERIAL);

    glEnable(GL_LIGHTING);

    ///打光2:要設定光light的設定值 (前面有陣列,這裡拿來用

    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);

    ///打光2.2: 要把物體也設定好它的 material

    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);

    glutIdleFunc(display);

    glutMainLoop();

}