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OpenGL视点跟踪物体运动
视点跟踪一个节点运动的原理是:把物体矩阵取反。
#include <stdlib.h>
#include <stdio.h>
#include <gl/glut.h>
#include <math.h>
#include <time.h>
GLfloat angle = 0.0;
GLfloat theta = 0.0, vp = 6;
//vp视点的位置
GLfloat cenx, ceny;
const
int
PI = 3.1415926;
const
double
N = 200.0;
int
myWin;
const
int
MAX_MAP = 500;
int
myMap[MAX_MAP][MAX_MAP];
inline
double
aToR(
double
x)
{
return
x/180.0 * 3.1415926;
}
void
openLight()
{
float
light_position[4] = {30, 30, 30, 0};
float
light_ambient[4] = {1.0, 1.0, 1.0, 1.0};
float
light_diffuse[4] = { 1.0, 1.0, 1.0, 1.0};
glLightfv(GL_LIGHT0,GL_POSITION,light_position);
glLightfv(GL_LIGHT0,GL_AMBIENT,light_ambient);
glLightfv(GL_LIGHT0, GL_DIFFUSE, light_diffuse);
glEnable( GL_LIGHTING );
glEnable( GL_LIGHT0 );
}
void
cube()
{
typedef
float
point3[3];
typedef
int
edge[2];
typedef
int
face[4];
point3 vertices[8] = {
{-1.0, -1.0, -1.0},
{-1.0, -1.0, 1.0},
{-1.0, 1.0, -1.0},
{-1.0, 1.0, 1.0},
{1.0, -1.0, -1.0},
{1.0, -1.0, 1.0},
{1.0, 1.0, -1.0},
{1.0, 1.0, 1.0}
};
point3 normals[6] = {
{-1.0, 0.0, 0.0},
{0.0, 0.0, 1.0},
{0.0, 1.0, 0.0},
{0.0, 0.0, -1.0},
{0.0, -1.0, 0.0},
{1.0, 0.0, 0.0}
};
edge edges[24] = {
{0, 1}, {1, 3}, {3, 2}, {2, 0},
{0, 4}, {1, 5}, {3, 7}, {2, 6},
{4, 5}, {5, 7}, {7, 6}, {6, 4},
{1, 0}, {3, 1}, {2, 3}, {0, 2},
{4, 0}, {5, 1}, {7, 3}, {6, 2},
{5, 4}, {7, 5}, {6, 7}, {4, 6}
};
face cube[6] =
{
{0, 1, 2, 3}, {5, 9, 18, 13},
{14, 6, 10, 19}, {7, 11, 16, 15},
{4, 8, 17, 12}, {22, 21, 20, 23}
};
//GLdouble myClipPlane[] = {1.0, 1.0, 0.0, -1.0};
//glClipPlane(GL_CLIP_PLANE0, myClipPlane);
///glEnable(GL_DEPTH_TEST);
//glEnable(GL_CLIP_PLANE0);
glBegin(GL_QUADS);
for
(
int
face = 0; face < 6; face ++)
{
glNormal3fv(normals[face]);
for
(
int
edge = 0; edge < 4; edge ++)
{
glVertex3fv(vertices[edges[cube[face][edge]][0]]);
}
}
glEnd();
//glDisable(GL_CLIP_PLANE0);
}
void
qumian()
{
glLineWidth(10);
glBegin(GL_LINES);
glVertex3f(40, 0, 0);
glVertex3f(0, 20, 0);
glEnd();
}
void
display(
void
)
{
glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glEnable(GL_DEPTH_TEST);
glClearColor(0, 0, 0.5, 1);
openLight();
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
gluLookAt(0, 0, 0, 0.0, 0.0, -1.0, 0.0, 1.0, 0.0);
glTranslatef(0, 0, -12);
//glTranslatef(0, -5, 0);
glRotatef(-angle, 0.0, 0.0, 1.0);
//glScalef(10, 10, 10);
glPushMatrix();
glRotatef(angle, 0.0, 0.0, 1.0);
//glTranslatef(0, 5, 0);
cube();
glPopMatrix();
glPushMatrix();
glTranslatef(2, 2, -9);
cube();
glPopMatrix();
glPushMatrix();
glTranslatef(2, 3, -2);
cube();
glPopMatrix();
glPushMatrix();
glTranslatef(-1, 3, 2);
cube();
glPopMatrix();
glutSwapBuffers();
}
void
reshape(
int
w,
int
h)
{
int
min = w < h?w:h;
int
cenx = w * 0.5;
int
ceny = h * 0.5;
glViewport(cenx - min*0.5, ceny - min*0.5, (GLsizei)min, (GLsizei)min);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
gluPerspective(60, 1, 0.1, 300.0);
glutPostRedisplay();
}
void
iterationStep(
void
)
{
angle += 1.0;
cenx = cos(angle / 180 * 3.14159) * vp + vp;
ceny = sin(angle / 180 * 3.14159) * vp;
}
void
animate(
void
)
{
iterationStep();
glutPostRedisplay();
}
int
main (
int
argc,
char
** argv )
{
glutInit(&argc, argv);
glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB | GLUT_DEPTH);
//这里必须使用双缓冲区,双缓冲区通过在后一个缓冲区里绘画,并不停交换前后缓冲区(可见缓冲区),来产生平滑的动画,使用双缓冲区可以有效的预防闪烁。
glutInitWindowSize(500, 500);
glutInitWindowPosition(50, 50);
myWin = glutCreateWindow(
"画球"
);
glutDisplayFunc(display);
glutReshapeFunc(reshape);
glutIdleFunc(animate);
glutMainLoop();
}
最终效果图如下所示:
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