Week15 +0筆記

 



GLUT 投影（Projection）、矩陣 的3D模型打光：

#include <GL/glut.h> #include "glm.h" ///for glmReadOBJ(), glmDraw(), glmUnitized().... GLMmodel * pmodel=NULL;///NOW 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_DOUBLE | GLUT_DEPTH); glutInitWindowSize(500,500); glutCreateWindow("week15"); glutDisplayFunc(display); glClearColor(205/255.0,92/255.0,92/255.0,1); ///light GLfloat light_pos[] = { 0.0, 0.0, -1.0, 0.0 };///position glEnable(GL_DEPTH_TEST);///depth glEnable(GL_LIGHT0);///open light glEnable(GL_LIGHTING);///open light glLightfv(GL_LIGHT0, GL_POSITION, light_pos);///position glutMainLoop(); }

GLUT 投影（Projection）、矩陣 的3D模型打光加上 timer 做位置移動、轉動：

一開始有破圖：

#include <GL/glut.h> #include "glm.h" ///for glmReadOBJ(), glmDraw(), glmUnitized().... GLMmodel * pmodel=NULL;///NOW 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> float eyeX=1, eyeY=0, eyeZ=0; void timer(int t) { ///camera glutTimerFunc(33, timer, t+1); float angle=t/180.0*3.1415926; eyeX=cos(angle); eyeZ=sin(angle); glMatrixMode(GL_MODELVIEW); glLoadIdentity(); gluLookAt(eyeX, eyeY, eyeZ, 0.0, 0.8, 0.0, 0, 1, 0); glutPostRedisplay(); } int main(int argc, char**argv) { glutInit(&argc, argv); glutInitDisplayMode(GLUT_DOUBLE | GLUT_DEPTH); glutInitWindowSize(500,500); glutCreateWindow("week15"); glutDisplayFunc(display); glutTimerFunc(33, timer, 0);///timer glClearColor(205/255.0,92/255.0,92/255.0,1); ///light GLfloat light_pos[] = { 0.0, 0.0, -1.0, 0.0 };///position glEnable(GL_DEPTH_TEST);///depth glEnable(GL_LIGHT0);///open light glEnable(GL_LIGHTING);///open light glLightfv(GL_LIGHT0, GL_POSITION, light_pos);///position glutMainLoop(); }

改善破圖：

#include <GL/glut.h> #include "glm.h" ///for glmReadOBJ(), glmDraw(), glmUnitized().... GLMmodel * pmodel=NULL;///NOW 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> float eyeX=1, eyeY=0, eyeZ=0; void timer(int t) { ///camera glutTimerFunc(33, timer, t+1); float angle=t/180.0*3.1415926; eyeX=cos(angle); eyeZ=sin(angle); glMatrixMode(GL_PROJECTION);///NOW4 glLoadIdentity();///NOW4 glOrtho(-1,+1, -1,+1, -10,+10);///NOW4 可以看到範圍比較大的投影法 glMatrixMode(GL_MODELVIEW); glLoadIdentity(); gluLookAt(eyeX, eyeY, eyeZ, 0.0, 0.6, 0.0, 0, 1, 0); glutPostRedisplay(); } int main(int argc, char**argv) { glutInit(&argc, argv); glutInitDisplayMode(GLUT_DOUBLE | GLUT_DEPTH); glutInitWindowSize(500,500); glutCreateWindow("week15"); glutDisplayFunc(display); glutTimerFunc(33, timer, 0);///timer glClearColor(205/255.0,92/255.0,92/255.0,1); ///light GLfloat light_pos[] = { 0.0, 0.0, 1.0, 0.0 };///position glEnable(GL_DEPTH_TEST);///depth glEnable(GL_LIGHT0);///open light glEnable(GL_LIGHTING);///open light glLightfv(GL_LIGHT0, GL_POSITION, light_pos);///position glutMainLoop(); }

調整距離：

#include <GL/glut.h> #include "glm.h" ///for glmReadOBJ(), glmDraw(), glmUnitized().... GLMmodel * pmodel=NULL;///NOW 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> float eyeX=1, eyeY=0, eyeZ=0; void timer(int t) { ///camera glutTimerFunc(33, timer, t+1); float angle=t/180.0*3.1415926; eyeX=cos(angle); eyeZ=sin(angle); glMatrixMode(GL_PROJECTION);///NOW4 glLoadIdentity();///NOW4 gluPerspective(60, 1, 0.001, 1000); //glOrtho(-1,+1, -1,+1, -15,+15);///NOW4 可以看到範圍比較大的投影法 glMatrixMode(GL_MODELVIEW); glLoadIdentity(); gluLookAt(eyeX, eyeY, eyeZ, 0.0, 0.5, 0.0, 0, 1, 0); glutPostRedisplay(); } int main(int argc, char**argv) { glutInit(&argc, argv); glutInitDisplayMode(GLUT_DOUBLE | GLUT_DEPTH); glutInitWindowSize(500,500); glutCreateWindow("week15"); glutDisplayFunc(display); glutTimerFunc(33, timer, 0);///timer glClearColor(205/255.0,92/255.0,92/255.0,1); ///light GLfloat light_pos[] = { 0.0, 0.0, 1.0, 0.0 };///position glEnable(GL_DEPTH_TEST);///depth glEnable(GL_LIGHT0);///open light glEnable(GL_LIGHTING);///open light glLightfv(GL_LIGHT0, GL_POSITION, light_pos);///position glutMainLoop(); }