11160933_week06

 #期中考題https://jsyeh.org/gl/

1.open GLUT new file week06-0_sample

for later copy

2.open GLUT new file week06-1_lighting

3.貼上11行

#include <GL/glut.h>

void display()

{

     glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

     glutSolidTeapot( 0.3 );

     glutSwapBuffers();

}

int main(int argc, char *argv[])

{

glutInit(&argc, argv);

glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH);

glutCreateWindow("week06 lighting");

glutDisplayFunc(display);

glutMainLoop();

}

4.copy const

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 };

5.copy12+2line before main loop

    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);

6.茶壺呈現昏暗 改light position 為-5

7.改diffuse 改變光的顏色

8.https://jsyeh.org/3dcg10/

windows light material

data 

9. open GLUT new file week06-2_lighting_glNormal3f

copy-1

10.加 float angle = 0;///轉動

     glPushMatrix();

        glRotatef(angle++, 0, 1, 0); ///y軸

        glBegin(GL_POLYGON);

            glNormal3f(0, 0, 1);

            glVertex2f(-1,-1);

            glVertex2f(+1,-1);

            glVertex2f(+1,+1);

            glVertex2f(-1,+1);

        glEnd();

     glPopMatrix();

glutIdleFunc(display)

11. open GLUT new file week06-3_glm_obj_model

copy 11lines

download source.zip open transformation glm.h glm.c in notepad

12.put glm.h in桌面\week06-3_glm_obj_model

put glm.c and rename as glm.cpp

13.add file glm.cpp

#include "glm.h"

GLMmodel * pmodel = NULL;

void

drawmodel(void)

{

    if (!pmodel) {

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

    if (!pmodel) exit(0);

    glmUnitize(pmodel);

    glmFacetNormals(pmodel);

    glmVertexNormals(pmodel, 90.0);

    }

    glmDraw(pmodel, GLM_SMOOTH | GLM_MATERIAL);

}

drawmodel();取代//glutSolidTeapot( 0.3 );

14.複製data到freeglut bin

15. week06-3_glm_obj_model_light_again 示範

16.上傳github -3只留cpp h