主題: 打光 Lighting
期中考題目
前往老師的模擬期中考網站練習https://jsyeh.org/gl/opengl_10_func.html
week06-0_sample
1.安裝freeglut，開GLUT專案並取成week06-0_sample
2.ctrl+F找程式碼light
/*cpp
///光1~3跟光的位置
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 };
///光1~3跟光的材質
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 };
*/
/*cpp
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);
*/
week06-1_lighting
功能是打光在茶壺上
1.開GLUT專案並取成week06-1_lighting
2.貼上GLUT 11行程式並貼上week06-0_sample找的程式碼
3.執行後茶壺暗暗的，因為背光，所以需要更改光線的位置
const GLfloat light_position[] = { 2.0f, 5.0f, -5.0f, 0.0f };//改成-5
///也能改變燈光的顏色
const GLfloat light_diffuse[] = { 1.0f, 1.0f, 0.0f, 1.0f };//改成0.0
課本教材
week06-2_lighting_glNormal3f
功能是打光在茶壺跟平面上並旋轉
1.開GLUT專案並取成week06-2_lighting_glNormal3f
2.修改week06-1_lighting，加上四邊形，設定法向量
#include <GL/glut.h>
float angle = 0;///角度變數
void display(){
glClear(GL_COLOR_BUFFER_BIT |GL_DEPTH_BUFFER_BIT);
glPushMatrix();
glRotatef(angle++, 0, 1, 0);///對Y軸轉
glBegin(GL_POLYGON);
glNormal3f(0, 0, 1);///打光的法向量
glVertex2f(-1, -1);
glVertex2f(+1, -1);
glVertex2f(+1, +1);
glVertex2f(-1, +1);
glEnd();
glutSolidTeapot( 0.3 );
glPopMatrix();
glutSwapBuffers();
}
///這裡放8行打光的陣列宣告
const GLfloat light_ambient[] = { 0.0f, 0.0f, 0.0f, 1.0f };
const GLfloat light_diffuse[] = { 1.0f, 1.0f, 0.0f, 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 };
int main(int argc, char*argv[])
{
glutInit(&argc, argv);
glutInitDisplayMode(GLUT_DOUBLE|GLUT_DEPTH);
glutCreateWindow("week06 lighting");
glutDisplayFunc(display);
glutIdleFunc(display);///記得加了才會轉
///這裡放12+2行打光的程式碼
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();
}
week06-3_glm_obj_model
功能是出現車子模型
1.開GLUT專案並取成week06-3_glm_obj_model
2.貼上GLUT 11行程式碼
3.從課本範例source資料夾有3個檔案transformation.c glm.c glm.h
4.專案要做設定
將glm.h跟glm.c(改成cpp)放入桌面week06-3_glm_obj_model資料夾中
於GLUT專案中右鍵新增這兩個檔案
#include "glm.h"
GLMmodel* pmodel = NULL;
void drawmodel(void)
{
if (!pmodel) {
pmodel = glmReadOBJ("data/porsche.obj");
if (!pmodel) exit(0);
glmUnitize(pmodel);
glmFacetNormals(pmodel);
glmVertexNormals(pmodel, 90.0);
}
glmDraw(pmodel, GLM_SMOOTH | GLM_MATERIAL);
}
6.把找到的程式碼貼上
#include <GL/glut.h>
#include "glm.h"///新增1
GLMmodel* pmodel = NULL;///新增2
void drawmodel(void)///新增3
{
if (!pmodel) {
pmodel = glmReadOBJ("data/porsche.obj");///這裡改想要呈現圖片的檔名
if (!pmodel) exit(0);
glmUnitize(pmodel);
glmFacetNormals(pmodel);
glmVertexNormals(pmodel, 90.0);
}
glmDraw(pmodel, GLM_SMOOTH | GLM_MATERIAL);
}
void display()
{
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
drawmodel();///新增4取代glutSolidTeapot( 0.3 )
glutSwapBuffers();
}
int main(int argc, char *argv[])
{
glutInit(&argc, argv);
glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH);
glutCreateWindow("week06_glm_obj_model");
glutDisplayFunc(display);
glutMainLoop();
}
week06-3_glm_obj_model_light_again
小葉老師示範把它們整合起來>回家在試，因為會卡住的樣子~
Github
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