OpenGL'de renkler nasıl değiştirilir?

Question

Koordinat düzleminin her parçasını farklı renklerde (y kırmızı, x mavi, z yeşil renkte) renklendirmek istiyorum, ancak yalnızca ışığın rengini (kırmızı) hatırlıyor gibi görünüyor. Eğer birisi bana bu problemle yardım edebilirse minnettar olurum.

#include <GL/glut.h> 

//func 
void setCamera(); 
void drawCP(); 
void drawPoints(); 
void drawCrtice(); 

GLfloat light_diffuse[] = {1.0, 0.0, .0, 0.0}; /* Red diffuse light. */ 
GLfloat light_position[] = {0.0, 0.0, 1.0, 0.0}; /* Infinite light location. */ 

GLfloat n[6][3] = {/* Normals for the 6 faces of a cube. */ 
    {-1.0, 0.0, 0.0}, 
    {0.0, 1.0, 0.0}, 
    {1.0, 0.0, 0.0}, 
    {0.0, -1.0, 0.0}, 
    {0.0, 0.0, 1.0}, 
    {0.0, 0.0, -1.0} 
}; 
GLint faces[6][4] = {/* Vertex indices for the 6 faces of a cube. */ 
    {0, 1, 2, 3}, 
    {3, 2, 6, 7}, 
    {7, 6, 5, 4}, 
    {4, 5, 1, 0}, 
    {5, 6, 2, 1}, 
    {7, 4, 0, 3} 
}; 
GLfloat v[8][3]; /* Will be filled in with X,Y,Z vertexes. */ 
void 
drawBox(void) { 
    int i; 

    for (i = 0; i < 6; i++) { 
    glBegin(GL_QUADS); 
    glNormal3fv(&n[i][0]); 
    glVertex3fv(&v[faces[i][0]][0]); 
    glVertex3fv(&v[faces[i][1]][0]); 
    glVertex3fv(&v[faces[i][2]][0]); 
    glVertex3fv(&v[faces[i][3]][0]); 
    glEnd(); 
    } 
} 

void 
display(void) { 
    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); 
    drawBox(); 
    drawCP(); 
    glClearColor(0.6f, 0.6f, 0.6f, 1.0f); 
    glRotatef(0.2, 0, 5, 0); 
    glutPostRedisplay(); 
    glutSwapBuffers();} 

void 
init(void) { 
    /* Setup cube vertex data. */ 
    v[0][0] = v[1][0] = v[2][0] = v[3][0] = -1; 
    v[4][0] = v[5][0] = v[6][0] = v[7][0] = 1; 
    v[0][1] = v[1][1] = v[4][1] = v[5][1] = -1; 
    v[2][1] = v[3][1] = v[6][1] = v[7][1] = 1; 
    v[0][2] = v[3][2] = v[4][2] = v[7][2] = 1; 
    v[1][2] = v[2][2] = v[5][2] = v[6][2] = -1; 

    /* Enable a single OpenGL light. */ 
    glLightfv(GL_LIGHT0, GL_DIFFUSE, light_diffuse); 
    glLightfv(GL_LIGHT0, GL_POSITION, light_position); 
    glEnable(GL_LIGHT0); 
glEnable(GL_LIGHTING); 

    /* Use depth buffering for hidden surface elimination. */ 
    glEnable(GL_DEPTH_TEST); 
    setCamera();} 

void drawLines() { 
    glBegin(GL_LINES); 

    for (int i = 10; i != 0; i--) { 

    // po x osi 
    glVertex2f(-i, -0.1); 
    glVertex2f(-i, 0.1); 
    glVertex2f(i, -0.1); 
    glVertex2f(i, 0.1); 
    //po y osi 
    glVertex2f(-0.1, -i); 
    glVertex2f(0.1, -i); 
    glVertex2f(-0.1, i); 
    glVertex2f(0.1, i); 

    //po z osi 
     glColor3f(1.0f, 0.0f, 0.0f); //seems it doesnt register 
    glVertex3f(0, -0.3, -i); 
    glVertex3f(0, 0.3, -i); 
    glVertex3f(0, -0.3, i); 
    glVertex3f(0, 0.3, i);} 
    glEnd();} 

void drawCP() { 

    //drawPoints(); 
    drawLines(); 
    glBegin(GL_LINES); 
    glLineWidth(100); 
    glVertex2f(-10.0f, 0); 
    glVertex2f(10.0f, 0); 
    glVertex2f(0.0f, 10); 
    glVertex2f(0.0f, -10); 
    glEnd(); 




} 

void setCamera() { 
    /* Setup the view of the cube. */ 
    glMatrixMode(GL_PROJECTION); 

    gluPerspective(/* field of view in degree */ 50.0, /* aspect ratio */ 1, /* Z near */ 1, /* Z far */ 100.0); 

    glMatrixMode(GL_MODELVIEW); 
    glLoadIdentity(); 
    /* Setup the view of the cube. */ 
    gluLookAt(0, 0, 10 /*pozicija kamere*/, 0, 0, 0/* u koju tocku gleda ta kamera*/, 0, 1, 0 /*moran jos viti ca je to*/); 


} 

int 
main(int argc, char **argv) { 
    glutInit(&argc, argv); 
    glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB | GLUT_DEPTH); 
    glutCreateWindow("red 3D lighted cube"); 
    glutDisplayFunc(display); 
    init(); 
// glutTimerFunc(10, rotate, 10); 
    glutMainLoop(); 
    return 0; /* ANSI C requires main to return int. */ 
} 

Answer 1

Ekleme: glEnable(GL_COLOR_MATERIAL);. Bu OpenGL'e malzeme özelliklerinin glColor() işleviyle tanımlanacağını söyler, genişletilebilir, ancak beklediğiniz şeyi almanız gerekir.