了解投影矩陣[ ]4*4
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1.投影矩陣
2.Camera運鏡
3.gluLookAt( )->Camera 中心點/Object主角中心點/Up向量
4.期末作品(下週展示)
TODO:Copy resize() 有透視有投影有LookAt
1.到我的Teapot中
程式碼:
#include <GL/glut.h>
void display()
{
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glPushMatrix();
glutSolidTeapot(0.3);
glPopMatrix();
glutSwapBuffers();
}
void resize( int w, int h )
{
glViewport( 0, 0, (GLsizei) w, (GLsizei) h );
glMatrixMode( GL_PROJECTION );
glLoadIdentity();
gluPerspective( 65.0, (GLdouble) w / h,1.0, 100.0 );
glMatrixMode( GL_MODELVIEW );
glLoadIdentity();
gluLookAt( 0.0, 0.0, 5.0,
0.0, 0.0, 0.0,
0.0, 1.0, 0.0 );
}
int main(int argc, char**argv)
{
glutInit(&argc,argv);
glutInitDisplayMode(GLUT_DOUBLE | GLUT_DEPTH);
glutCreateWindow("camera");
glutDisplayFunc(display);
glutReshapeFunc(resize);
glutMainLoop();
}
2.TODO:用motion()來改變LookAt的攝影師位置
程式碼:
#include <GL/glut.h>
void display()
{
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glPushMatrix();
glutSolidTeapot(0.9);
glPopMatrix();
glutSwapBuffers();
}
void resize(int w,int h)
{
glViewport(0,0,(GLsizei)w,(GLsizei)h);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
gluPerspective(65.0,(GLdouble)w/h,1.0,100.0);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
gluLookAt(0.0,0.0,5.0
,0.0,0.0,0.0
,0.0,1.0,0.0);
}
void motion(int x, int y)
{
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
gluLookAt(x/100.0,y/100.0,5.0,
0.0,0.0,0.0,
0.0,1.0,0.0);
glutPostRedisplay();
}
int main(int argc, char**argv)
{
glutInit(&argc,argv);
glutInitDisplayMode(GLUT_DOUBLE | GLUT_DEPTH);
glutCreateWindow("camera");
glutDisplayFunc(display);
glutMotionFunc(motion);
glutReshapeFunc(resize);
glutMainLoop();
}
3.
#include <stdio.h>
#include <GL/glut.h>FILE *fout=NULL, *fin=NULL;
float rot[10]={0}, rotOld[10]={0},rotNew[10]={0};
int rotID=1, oldX=0,oldY=0;
void display()
{
glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
gluLookAt( rot[7]/100.0, rot[8]/100.0, 5.0,
0.0, 0.0, 0.0,
0.0, 1.0, 0.0 );
glPushMatrix();
glPushMatrix();
glScalef(6,6,6);
glutWireCube(0.3);
glPushMatrix();
glTranslatef(0,0.2,0);
glutWireCube(0.1);
glPopMatrix();
glPushMatrix();
glTranslatef(0.15,0.1,0);
glRotatef(rot[1],0,0,1);
glTranslatef(0.05,0,0);
glutWireCube(0.1);
glTranslatef(0.05,0,0);
glRotatef(rot[2],0,0,1);
glTranslatef(0.05,0,0);
glutWireCube(0.1);
glTranslatef(0.05,0,0);
glRotatef(rot[3],0,0,1);
glTranslatef(0.05,0,0);
glutWireCube(0.1);
glPopMatrix();
glPushMatrix();
glTranslatef(-0.15,0.1,0);
glRotatef(-rot[4],0,0,1);
glTranslatef(-0.05,0,0);
glutWireCube(0.1);
glTranslatef(-0.05,0,0);
glRotatef(-rot[5],0,0,1);
glTranslatef(-0.05,0,0);
glutWireCube(0.1);
glTranslatef(-0.05,0,0);
glRotatef(-rot[6],0,0,1);
glTranslatef(-0.05,0,0);
glutWireCube(0.1);
glPopMatrix();
glPopMatrix();
glPopMatrix();
glutSwapBuffers();
}
void mouse(int button, int state, int x, int y)
{
if(state==GLUT_DOWN){
oldX=x; oldY=y;
}
}void motion(int x, int y)
{
rot[rotID] += (x-oldX);
oldX=x;
glutPostRedisplay();
}
void timer(int t)
{
float alpha=(t%10)/10.0;
if(t%10==0){
for(int i=0;i<10;i++){
rotOld[i]=rotNew[i];
fscanf( fin, "%f ", &rotNew[i]);;
printf( "%f ", rotNew[i]);;
}
fprintf(fin, "\n");
printf("\n");
}
for(int i=0;i<10;i++)
{
rot[i]=rotNew[i]*alpha+rotOld[i]*(1-alpha);
}
glutTimerFunc(100,timer,t+1);
glutPostRedisplay();
}
void keyboard(unsigned char key, int x, int y)
{
if(key=='1') rotID=1;
if(key=='2') rotID=2;
if(key=='3') rotID=3;
if(key=='4') rotID=4;
if(key=='5') rotID=5;
if(key=='6') rotID=6;
if(key=='7') rotID=7;
if(key=='8') rotID=8;
if(key=='9') rotID=9;
if(key=='r'){
if(fin==NULL) fin=fopen("motion.txt","r");
for(int i=0;i<10;i++){
fscanf( fin, "%f ", &rot[i]);;
printf( "%f ", rot[i]);;
}
fprintf(fin, "\n");
printf("\n");
}
if(key=='s'){
if(fout==NULL) fout=fopen("motion.txt","w+");
for(int i=0;i<10;i++){
fprintf( fout, "%3.1f ", rot[i]);;
printf( "%3.1f ", rot[i]);;
}
fprintf(fout, "\n");
printf("\n");
}
if(key=='t'){
if(fin==NULL) fin=fopen("motion.txt","r");
for(int i=0;i<10;i++){
fscanf( fin, "%f ", &rotNew[i]);;
printf( "%f ", rotNew[i]);;
}
fprintf(fin, "\n");
printf("\n");
glutTimerFunc(100,timer,0);
}
glutPostRedisplay();///請電腦貼個公告,有空就重新display
}
void resize( int w, int h )
{
glViewport( 0, 0, (GLsizei) w, (GLsizei) h );
glMatrixMode( GL_PROJECTION );
glLoadIdentity();
gluPerspective( 65.0, (GLdouble) w / h,1.0, 100.0 );
glMatrixMode( GL_MODELVIEW );
glLoadIdentity();
gluLookAt( 0.0, 0.0, 5.0,
0.0, 0.0, 0.0,
0.0, 1.0, 0.0 );
}
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