寶欸學習筆記_W15

(1).主題 : 攝影機 , 運鏡

(2).主題 : 投影 , 矩陣

(3).複習 : 移動位置 v.s. 轉動

(4).複習 : 背景貼圖

(5).期末作品

1.

先到http://www.cmlab.csie.ntu.edu.tw/~jsyeh/3dcg10/下載3個並且解壓縮

data 跟win32.dll方到window資料夾

執行project.exe

觀察glLookAt的三組參數改變之後的圖形變化

2.codeblocks建立glut專案

下載freeglut

複製libfreeglut.a改成libglut32.a(跟第一周一樣)

一直下一步

主題一:攝影機運鏡

(1)先出來空白模型

#include <GL/glut.h>///GLUT 外掛
#include "glm.h"///glm.cpp for 3D model glmReadOBJ(), glmDraw(), glmUnitized()
GLMmodel * pmodel=NULL;///指標
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);
}
void display(void)
{
    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
    drawmodel();
    glutSwapBuffers();
}

int main(int argc, char** argv)
{
    glutInit(&argc, argv);
    glutInitDisplayMode(GLUT_DEPTH | GLUT_DOUBLE);
    glutInitWindowSize(512,512);
    glutInitWindowPosition(50, 50);
    glutCreateWindow("week15");

//    glutReshapeFunc(reshape);
    glutDisplayFunc(display);

    glutMainLoop();

    return 0;
}

(2)加上打光

#include <GL/glut.h>///GLUT 外掛
#include "glm.h"///glm.cpp for 3D model glmReadOBJ(), glmDraw(), glmUnitized()
GLMmodel * pmodel=NULL;///指標
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);
}
void display(void)
{
    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
    drawmodel();
    glutSwapBuffers();
}

int main(int argc, char** argv)
{
    glutInit(&argc, argv);
    glutInitDisplayMode(GLUT_DEPTH | GLUT_DOUBLE);
    glutInitWindowSize(512,512);
    glutInitWindowPosition(50, 50);
    glutCreateWindow("week15");

//    glutReshapeFunc(reshape);
    glutDisplayFunc(display);

    GLfloat light_pos[] = { 0.0, 0.0, -1.0, 0.0 };
    glEnable(GL_DEPTH_TEST);
    glEnable(GL_LIGHTING);
    glEnable(GL_LIGHT0);
    glLightfv(GL_LIGHT0, GL_POSITION, light_pos);
    glutMainLoop();

    return 0;

}

(3)Timer函式與運鏡

#include <GL/glut.h>///GLUT 外掛#include "glm.h"///glm.cpp for 3D model glmReadOBJ(), glmDraw(), glmUnitized()GLMmodel * pmodel=NULL;///指標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);}void display(void){    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);    drawmodel();    glutSwapBuffers();}#include <math.h>///for sin() cos() ///NOW3float eyeX=0.5, eyeY=0, eyeZ=0; ///NOW3void timer(int t)///NOW3{    float angle = (t/180.0)*3.1415926; ///NOW3    eyeX=0.5*cos(angle); ///NOW3    eyeZ=0.5*sin(angle); ///NOW3
    glutTimerFunc(33, timer, t+1);///NOW3    glMatrixMode(GL_MODELVIEW);///NOW3    glLoadIdentity();///NOW3    gluLookAt( eyeX, eyeY, eyeZ,///eye ///NOW3            0, 0, 0,///center ///NOW3               0, 1, 0);///up    ///NOW3
    glutPostRedisplay();///NOW3}int main(int argc, char** argv){    glutInit(&argc, argv);    glutInitDisplayMode(GLUT_DEPTH | GLUT_DOUBLE);    glutInitWindowSize(512,512);    glutInitWindowPosition(50, 50);    glutCreateWindow("week15");//    glutReshapeFunc(reshape);    glutDisplayFunc(display);    glutTimerFunc(33, timer, 0);///NOW3
    GLfloat light_pos[] = { 0.0, 0.0, 1.0, 0.0 };    glEnable(GL_DEPTH_TEST); glEnable(GL_LIGHTING);    glEnable(GL_LIGHT0);    glLightfv(GL_LIGHT0, GL_POSITION, light_pos);
    glutMainLoop();
    return 0;}

主題二:投影矩陣

在timer函式中加上這三行

就像是檢查視野寬廣度

範圍中才能看得到

glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glOrtho(-1,+1,-1,+1,-10,+10);

.複習 : 移動位置 v.s. 轉動

.複習 : 背景貼圖

.期末作品