# Creating a 3D Solid Sphere in OpenGL

This is a discussion on Creating a 3D Solid Sphere in OpenGL within the C++ Programming forums, part of the General Programming Boards category; Hi guys! I'm working on a new OpenGL problem today: Creating a 3D Solid Sphere in OpenGL. I've used the ...

1. ## Creating a 3D Solid Sphere in OpenGL

Hi guys!

I'm working on a new OpenGL problem today: Creating a 3D Solid Sphere in OpenGL.

I've used the following code to define a class '3DSphere.cpp' (according to Link).

Code:
```/*
* 3DSphere.cpp
*
*  Created on: Oct 30, 2012
*      Author: guptaa
*/

#include <stdio.h>
#include <stdlib.h>

#include <gl.h>
#include <glu.h>
#include <glut.h>

#include <math.h>
#include <vector.h>

class 3DSphere
{

protected:
vector<GLfloat> vertices;
vector<GLfloat> normals;
vector<GLfloat> texcoords;
vector<GLushort> indices;

public:
void SolidSphere(float radius, unsigned int rings, unsigned int sectors)
{
float const R = 1./(float)(rings-1);
float const S = 1./(float)(sectors-1);
int r, s;

sphere_vertices.resize(rings * sectors * 3);
sphere_normals.resize(rings * sectors * 3);
sphere_texcoords.resize(rings * sectors * 2);
vector<GLfloat>::iterator v = sphere_vertices.begin();
vector<GLfloat>::iterator n = sphere_normals.begin();
vector<GLfloat>::iterator t = sphere_texcoords.begin();
for(r = 0; r < rings; r++) for(s = 0; s < sectors; s++) {
float const y = sin( -M_PI_2 + M_PI * r * R );
float const x = cos(2*M_PI * s * S) * sin( M_PI * r * R );
float const z = sin(2*M_PI * s * S) * sin( M_PI * r * R );

*t++ = s*S;
*t++ = r*R;

*n++ = x;
*n++ = y;
*n++ = z;
}

sphere_indices.resize(rings * sectors * 4);
std:vector<GLushort>::iterator i = sphere_indices.begin();
for(r = 0; r < rings; r++) for(s = 0; s < sectors; s++) {
*i++ = r * sectors + s;
*i++ = r * sectors + (s+1);
*i++ = (r+1) * sectors + (s+1);
*i++ = (r+1) * sectors + s;
}
}

void draw(GLfloat x, GLfloat y, GLfloat z)
{
glMatrixMode(GL_MODELVIEW);
glPushMatrix();
glTranslatef(x,y,z);

glEnableClientState(GL_VERTEX_ARRAY);
glEnableClientState(GL_NORMAL_ARRAY);
glEnableClientState(GL_TEXTURE_COORD_ARRAY);

glVertexPointer(3, GL_FLOAT, 0, &sphere_vertices[0]);
glNormalPointer(GL_FLOAT, 0, &sphere_normals[0]);
glTexCoordPointer(2, GL_FLOAT, 0, &sphere_texcoords[0]);
glPopMatrix();
}
}```

However, I receive the following error (ref: line 21 - opening of 3DSphere class):
invalid suffix "DSphere" on integer constant
It seems a C error rather than an OpenGL one.

Also - where does the actual drawing take place? There is no main function here!

2. First, this is C++ code, so this post should be moved to the C++ board.

Second, you cannot start an identifier with a digit. Only A-Za-z_ (and I think \$) are allowed for the first character of an identifier.

3. Originally Posted by christop
First, this is C++ code, so this post should be moved to the C++ board.

Second, you cannot start an identifier with a digit. Only A-Za-z_ (and I think \$) are allowed for the first character of an identifier.

Thanks for letting me know. I hope someone can shift this thread into another section.

I changed the name to just 'Sphere.cpp'. And now the rest of the error have started appearing:

Code:
```expected identifier before numeric constant    Sphere.cpp    /CreateSyntheticObjects    line 21    C/C++ Problem
expected unqualified-id before numeric constant    Sphere.cpp    /CreateSyntheticObjects    line 21    C/C++ Problem
Invalid arguments '
Candidates are:
void glDrawElements(unsigned int, int, unsigned int, const void *)

invalid suffix "DSphere" on integer constant    Sphere.cpp    /CreateSyntheticObjects    line 21    C/C++ Problem
Method 'begin' could not be resolved    Sphere.cpp    /CreateSyntheticObjects    line 40    Semantic Error

Method 'resize' could not be resolved    Sphere.cpp    /CreateSyntheticObjects    line 37    Semantic Error
Method 'size' could not be resolved    Sphere.cpp    /CreateSyntheticObjects    line 83    Semantic Error
Symbol 'sphere_indices' could not be resolved    Sphere.cpp    /CreateSyntheticObjects    line 60    Semantic Error
Symbol 'sphere_normals' could not be resolved    Sphere.cpp    /CreateSyntheticObjects    line 38    Semantic Error
Symbol 'sphere_texcoords' could not be resolved    Sphere.cpp    /CreateSyntheticObjects    line 39    Semantic Error
Symbol 'sphere_vertices' could not be resolved    Sphere.cpp    /CreateSyntheticObjects    line 37    Semantic Error```

4. Moved to C++ programming forum.