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. #1
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    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;
    
                    *v++ = x * radius;
                    *v++ = y * radius;
                    *v++ = z * radius;
    
                    *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]);
            glDrawElements(GL_QUADS, sphere_indices.size()/4, GL_UNSIGNED_SHORT, sphere_indices);
            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. #2
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    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. #3
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    Quote Originally Posted by christop View Post
    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. #4
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    Moved to C++ programming forum.
    Quote Originally Posted by Bjarne Stroustrup (2000-10-14)
    I get maybe two dozen requests for help with some sort of programming or design problem every day. Most have more sense than to send me hundreds of lines of code. If they do, I ask them to find the smallest example that exhibits the problem and send me that. Mostly, they then find the error themselves. "Finding the smallest program that demonstrates the error" is a powerful debugging tool.
    Look up a C++ Reference and learn How To Ask Questions The Smart Way

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