我正在尝试编写一个rubik立方体的接口.
但是当我画它时,立方体的脸上有污迹:
这是评论很好的代码.有人可以帮助我,也许运行代码并告诉我哪里可能出错了？
#include#include #include void init() { glClearColor(1.0f, 0.0f, 1.0f, 1.0f); glEnable(GL_DEPTH_TEST); } static float x_degs = 0.0f; static float y_degs = 0.0f; void keyboard(unsigned char key, int x, int y) { switch (key) { case 'q': exit(EXIT_SUCCESS); case 'h': y_degs -= 1.0f; glutPostRedisplay(); glutSwapBuffers(); break; case 'j': x_degs -= 1.0f; glutPostRedisplay(); glutSwapBuffers(); break; case 'k': x_degs += 1.0f; glutPostRedisplay(); glutSwapBuffers(); break; case 'l': y_degs += 1.0f; glutPostRedisplay(); glutSwapBuffers(); break; } } // half the length of one card static const float card_half_size = 1.0f; // half the space between cards static const float space_half_size = 0.1f; // number of cards per face static const int NUM_CARDS_PER_FACE = 4; /* // start position of center of top left card const float start = - 3 * (card_half_size + space_half_size); // increment between center of cards const float incr = 2 * (card_half_size + space_half_size); // half the size of a cube face const float cube_half_size = 4 * (card_half_size + space_half_size); */ // draw a card centered at the origin void draw_card() { glBegin(GL_QUADS); glVertex3f(- card_half_size, - card_half_size, 0.0f); glVertex3f(- card_half_size, card_half_size, 0.0f); glVertex3f(card_half_size, card_half_size, 0.0f); glVertex3f(card_half_size, - card_half_size, 0.0f); glEnd(); } // draw a cube face made up of cards void draw_card_face() { const float cube_half_size = 4 * (card_half_size + space_half_size); const float start = - 3 * (card_half_size + space_half_size); const float incr = 2 * (card_half_size + space_half_size); glColor3f(0.0f, 1.0f, 1.0f); glBegin(GL_QUADS); glVertex3f(- cube_half_size, - cube_half_size, -0.001f); glVertex3f(- cube_half_size, cube_half_size, -0.001f); glVertex3f(cube_half_size, cube_half_size, -0.001f); glVertex3f(cube_half_size, - cube_half_size, -0.001f); glEnd(); glColor3f(1.0f, 1.0f, 1.0f); for (int i = 0; i < NUM_CARDS_PER_FACE; i++) for (int j = 0; j < NUM_CARDS_PER_FACE; j++) { glPushMatrix(); glTranslatef(start + i * incr, start + j * incr, 0.0f); draw_card(); glPopMatrix(); } } // draw a cube made up of cards void draw_card_cube() { const float cube_half_size = 4 * (card_half_size + space_half_size); // front face glPushMatrix(); glTranslatef(0.0f, 0.0f, cube_half_size); draw_card_face(); glPopMatrix(); // back face glPushMatrix(); glTranslatef(0.0f, 0.0f, - cube_half_size); glRotatef(180.0f, 0.0f, 1.0f, 0.0f); draw_card_face(); glPopMatrix(); // right face glPushMatrix(); glTranslatef(cube_half_size, 0.0f, 0.0f); glRotatef(90.0f, 0.0f, 1.0f, 0.0f); draw_card_face(); glPopMatrix(); // left face glPushMatrix(); glTranslatef(- cube_half_size, 0.0f, 0.0f); glRotatef(- 90.0f, 0.0f, 1.0f, 0.0f); draw_card_face(); glPopMatrix(); // top face glPushMatrix(); glTranslatef(0.0f, cube_half_size, 0.0f); glRotatef(90.0f, 1.0f, 0.0f, 0.0f); draw_card_face(); glPopMatrix(); // bottom face glPushMatrix(); glTranslatef(0.0f, - cube_half_size, 0.0f); glRotatef(- 90.0f, 1.0f, 0.0f, 0.0f); draw_card_face(); glPopMatrix(); } void display() { glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); glLoadIdentity(); glRotatef(x_degs, 1.0f, 0.0f, 0.0f); glRotatef(y_degs, 0.0f, 1.0f, 0.0f); gluLookAt(-0.6f, 0.6f, 1.0f, 0.0f, 0.0f, 0.0f, 0.0f, 1.0f, 0.0f); draw_card_cube(); glutSwapBuffers(); } void reshape(int w, int h) { glMatrixMode(GL_PROJECTION); glLoadIdentity(); glOrtho(-15.0f, 15.0f, -15.0f, 15.0f, -15.0f, 15.0f); glViewport(0, 0, w, h); glMatrixMode(GL_MODELVIEW); } int main(int argc, char **argv) { glutInit(&argc, argv); glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH); glutCreateWindow(argv[0]); init(); glutKeyboardFunc(keyboard); glutDisplayFunc(display); glutReshapeFunc(reshape); glutMainLoop(); return 0; }
好吧,我已经修改了代码,以便我将0.01f单位后面的青色矩形绘制而不是0.001f单位,这似乎已经修复了z-fighting.但是,我本来希望使用glPolygonOffset(因子,单位)来解决这个问题,但我无法做到这一点,原因如下:
我不知道如何设置facor和单位(我已经尝试过1.0).
我尝试了不同的价值观,没有结果.
这是没有出血/拼接/ z战斗的代码:
#include#include #include void init() { glClearColor(1.0f, 0.0f, 1.0f, 1.0f); glEnable(GL_DEPTH_TEST); } static float x_degs = 0.0f; static float y_degs = 0.0f; void keyboard(unsigned char key, int x, int y) { switch (key) { case 'q': exit(EXIT_SUCCESS); case 'h': y_degs -= 1.0f; glutPostRedisplay(); glutSwapBuffers(); break; case 'j': x_degs -= 1.0f; glutPostRedisplay(); glutSwapBuffers(); break; case 'k': x_degs += 1.0f; glutPostRedisplay(); glutSwapBuffers(); break; case 'l': y_degs += 1.0f; glutPostRedisplay(); glutSwapBuffers(); break; } } // half the length of one card static const float card_half_size = 1.0f; // half the space between cards static const float space_half_size = 0.1f; // number of cards per face static const int NUM_CARDS_PER_FACE = 4; /* // start position of center of top left card const float start = - 3 * (card_half_size + space_half_size); // increment between center of cards const float incr = 2 * (card_half_size + space_half_size); // half the size of a cube face const float cube_half_size = 4 * (card_half_size + space_half_size); */ // draw a card centered at the origin void draw_card() { glBegin(GL_QUADS); glVertex3f(- card_half_size, - card_half_size, 0.0f); glVertex3f(- card_half_size, card_half_size, 0.0f); glVertex3f(card_half_size, card_half_size, 0.0f); glVertex3f(card_half_size, - card_half_size, 0.0f); glEnd(); } // draw a cube face made up of cards void draw_card_face() { const float cube_half_size = 4 * (card_half_size + space_half_size); const float start = - 3 * (card_half_size + space_half_size); const float incr = 2 * (card_half_size + space_half_size); glColor3f(0.0f, 1.0f, 1.0f); glBegin(GL_QUADS); glVertex3f(- cube_half_size, - cube_half_size, -0.001f); glVertex3f(- cube_half_size, cube_half_size, -0.001f); glVertex3f(cube_half_size, cube_half_size, -0.001f); glVertex3f(cube_half_size, - cube_half_size, -0.001f); glEnd(); glColor3f(1.0f, 1.0f, 1.0f); for (int i = 0; i < NUM_CARDS_PER_FACE; i++) for (int j = 0; j < NUM_CARDS_PER_FACE; j++) { glPushMatrix(); glTranslatef(start + i * incr, start + j * incr, 0.0f); draw_card(); glPopMatrix(); } } // draw a cube made up of cards void draw_card_cube() { const float cube_half_size = 4 * (card_half_size + space_half_size); // front face glPushMatrix(); glTranslatef(0.0f, 0.0f, cube_half_size); draw_card_face(); glPopMatrix(); // back face glPushMatrix(); glTranslatef(0.0f, 0.0f, - cube_half_size); glRotatef(180.0f, 0.0f, 1.0f, 0.0f); draw_card_face(); glPopMatrix(); // right face glPushMatrix(); glTranslatef(cube_half_size, 0.0f, 0.0f); glRotatef(90.0f, 0.0f, 1.0f, 0.0f); draw_card_face(); glPopMatrix(); // left face glPushMatrix(); glTranslatef(- cube_half_size, 0.0f, 0.0f); glRotatef(- 90.0f, 0.0f, 1.0f, 0.0f); draw_card_face(); glPopMatrix(); // top face glPushMatrix(); glTranslatef(0.0f, cube_half_size, 0.0f); glRotatef(90.0f, 1.0f, 0.0f, 0.0f); draw_card_face(); glPopMatrix(); // bottom face glPushMatrix(); glTranslatef(0.0f, - cube_half_size, 0.0f); glRotatef(- 90.0f, 1.0f, 0.0f, 0.0f); draw_card_face(); glPopMatrix(); } void display() { glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); glLoadIdentity(); glRotatef(x_degs, 1.0f, 0.0f, 0.0f); glRotatef(y_degs, 0.0f, 1.0f, 0.0f); gluLookAt(-0.6f, 0.6f, 1.0f, 0.0f, 0.0f, 0.0f, 0.0f, 1.0f, 0.0f); draw_card_cube(); glutSwapBuffers(); } void reshape(int w, int h) { glMatrixMode(GL_PROJECTION); glLoadIdentity(); glOrtho(-15.0f, 15.0f, -15.0f, 15.0f, -15.0f, 15.0f); glViewport(0, 0, w, h); glMatrixMode(GL_MODELVIEW); } int main(int argc, char **argv) { glutInit(&argc, argv); glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH); glutCreateWindow(argv[0]); init(); glutKeyboardFunc(keyboard); glutDisplayFunc(display); glutReshapeFunc(reshape); glutMainLoop(); return 0; }
rotoglup.. 5
我想你是把你的西洋跳棋作为主立方体面孔的共面四边形; 如果是这种情况,您遇到的问题称为"z格斗".
您可以看一下12.040点深度缓冲似乎有效,但多边形似乎会渗透到它们前面的多边形.这是怎么回事？这里:http: //www.opengl.org/resources/faq/technical/depthbuffer.htm
基本上,您的深度缓冲区没有足够的精度来解析每个像素显示哪个四边形,从而导致问题.
您可以手动为检查器四边形添加偏移量,以使它们远离多维数据集; 或使用深度偏差glPolygonOffset来解决问题.
我想你是把你的西洋跳棋作为主立方体面孔的共面四边形; 如果是这种情况,您遇到的问题称为"z格斗".
您可以看一下12.040点深度缓冲似乎有效,但多边形似乎会渗透到它们前面的多边形.这是怎么回事？这里:http: //www.opengl.org/resources/faq/technical/depthbuffer.htm
基本上,您的深度缓冲区没有足够的精度来解析每个像素显示哪个四边形,从而导致问题.
您可以手动为检查器四边形添加偏移量,以使它们远离多维数据集; 或使用深度偏差glPolygonOffset来解决问题.
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