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開學第一個功課就是印出平面的Gasket，這次的功課是印一個3D_Gasket而且做法也稍有不同。這次做法是取每個邊的中點，一直遞迴的做，再依序的印出面即可。
結果：
程式碼：
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| /******************** | |
| Computer Graghics | |
| Author：SHEN ZHI-XUN | |
| Time：2016/11/2 | |
| ********************/ | |
| #include <iostream> | |
| #include <GL/glut.h> | |
| #include <ctime> | |
| using namespace std; | |
| void triangle(GLfloat *a, GLfloat *b, GLfloat *c); | |
| void tetra(GLfloat *a, GLfloat *b, GLfloat *c, GLfloat *d); | |
| void divide_tetra(GLfloat *a, GLfloat *b, GLfloat *c, GLfloat *d, int m); | |
| void display() { | |
| glOrtho(-70, 70, -70, 70, -70, 70); | |
| GLfloat v[4][3] = { {0,0,0},{25,50,10},{50,0,25},{25,10,25} }; | |
| glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT); | |
| glBegin(GL_TRIANGLES); | |
| divide_tetra(v[0],v[1],v[2],v[3],3); | |
| glEnd(); | |
| glFlush(); | |
| } | |
| //畫平面三角形 | |
| void triangle(GLfloat *a, GLfloat *b, GLfloat *c) { | |
| glVertex3fv(a); | |
| glVertex3fv(b); | |
| glVertex3fv(c); | |
| } | |
| //畫四面體(由四個三角形形成)，並給上不同顏色以便區別 | |
| void tetra(GLfloat *a, GLfloat *b, GLfloat *c, GLfloat *d) { | |
| GLfloat colors[4][3] = { {1,0,0},{0,1,0},{0,0,1},{1,1,0} }; | |
| glColor3fv(colors[0]); | |
| triangle(a, b, c); | |
| glColor3fv(colors[1]); | |
| triangle(a, c, d); | |
| glColor3fv(colors[2]); | |
| triangle(a, d, b); | |
| glColor3fv(colors[3]); | |
| triangle(b, d, c); | |
| } | |
| //取邊的中點 | |
| void divide_tetra(GLfloat *a,GLfloat *b,GLfloat *c, GLfloat *d,int m) { | |
| GLfloat mid[6][3]; | |
| int j; | |
| if (m > 0) { | |
| for (j = 0; j < 3; j++) mid[0][j] = (a[j] + b[j]) / 2; | |
| for (j = 0; j < 3; j++) mid[1][j] = (a[j] + c[j]) / 2; | |
| for (j = 0; j < 3; j++) mid[2][j] = (a[j] + d[j]) / 2; | |
| for (j = 0; j < 3; j++) mid[3][j] = (b[j] + c[j]) / 2; | |
| for (j = 0; j < 3; j++) mid[4][j] = (b[j] + d[j]) / 2; | |
| for (j = 0; j < 3; j++) mid[5][j] = (c[j] + d[j]) / 2; | |
| divide_tetra(a, mid[0], mid[1], mid[2], m - 1); | |
| divide_tetra(mid[0], b, mid[3], mid[4], m - 1); | |
| divide_tetra(mid[1], mid[3], c, mid[5], m - 1); | |
| divide_tetra(mid[2], mid[4], mid[5], d, m - 1); | |
| }else { | |
| tetra(a,b,c,d); | |
| } | |
| } | |
| //維持內容物比例不變 | |
| void Reshape(int w, int h) { | |
| GLfloat aspectRatio; | |
| if (h == 0) h = 1; | |
| glViewport(0, 0, w, h); | |
| glMatrixMode(GL_PROJECTION); | |
| glLoadIdentity(); | |
| aspectRatio = (GLfloat)w / (GLfloat)h; | |
| if (w <= h) glOrtho(-1, 1, -1 / aspectRatio, 1 / aspectRatio, 1, -1); | |
| else glOrtho(-1 * aspectRatio, 1 * aspectRatio, -1, 1, 1, -1); | |
| glMatrixMode(GL_MODELVIEW); | |
| glLoadIdentity(); | |
| } | |
| int main(int argc, char **argv) { | |
| glutInitWindowSize(500, 500); | |
| glutCreateWindow("3D_Gasket"); | |
| glutDisplayFunc(display); | |
| glutReshapeFunc(Reshape); | |
| glutMainLoop(); | |
| } |
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