Array and classes problem

Sorry tabstop, I completed the question and made it better.
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I have a class like such:

Code:

---

class Sphere
{
public:
        Sphere(){};
        ~Sphere() {};
        Sphere(string m_name) : name(m_name) {};
        void SetValues(float m_posx, float m_posy, float m_posz,
                                        float m_sclx, float m_scly, float m_sclz,
                                        float m_r, float m_g, float m_b,
                                        float m_Ka, float m_Kd, float m_Ks, float m_Kr,
                                        float m_n)
        {
                Ka = m_Ka; Kd = m_Kd; Ks = m_Ks; Kr = m_Kr;
                n = m_n;
                radius = 1.00;
                center.x  =  0.00; center.y = 0.00; center.z = 0.00;
                sphereColor.r = m_r;
                sphereColor.g = m_g;
                sphereColor.b = m_b;
                SetTranformMatrix(m_posx, m_posy, m_posz,
                                                  m_sclx, m_scly, m_sclz);
        };

               
       
                //set the transfor matrix
        void SetTranformMatrix( float posx, float  posy, float posz,
                                                        float sclx, float  scly, float sclz)       
        {
                Trans[0][0] = sclx;
                Trans[0][1] = 0;
                Trans[0][2] = 0;
                Trans[0][3] = posx;
                Trans[1][0] = 0;
                Trans[1][1] = scly;
                Trans[1][2] = 0;
                Trans[1][3] = posy;
                Trans[2][0] = 0;
                Trans[2][1] = 0;
                Trans[2][2] = sclz;
                Trans[2][3] = posz;
                Trans[3][0] = 0;
                Trans[3][1] = 0;
                Trans[3][2] = 0;
                Trans[3][3] = 1;
        };

              //should return the depth at which the the ray has intersected otherwise return -1;
        double intersect(ray &m_ray)
        {

                double T_Inverse[4][4];
                invert_matrix(Trans, T_Inverse);

              //buncha lines here
        }
 
        std::string name;
        double Trans[4][4];        //transition matrix
        color sphereColor;

private:
        point center;
        double radius;
        float Ka, Kd, Ks, Kr;
        float n;        //specular

};

---

and a function like such:

Code:

---

float compute_closest_intersection(ray &m_ray, Sphere * m_spheres)
{
        float intersect = -1;
        float temp_intersect;
        for(int i=0; i < 3; i++)
        {
                temp_intersect = m_spheres[i].intersect(m_ray); //HERE HERE HERE HERE
                intersect = (temp_intersect >= intersect) ?  temp_intersect : intersect;
        }
        return intersect;
}

---

and in main I have

Code:

---

Sphere inputSphere[5];
float testiii = compute_closest_intersection(Thru_Pixel,InputSphere);

---

- and the problem: Trans[][] doesn't have values,
(where it was initialized in the SetTranformMatrix() function)
when the intersect is called from compute_closest_intersection function.

in a nutshell

Why doesn't Trans[][] keep the values assigned to it in the SetTranformMatrix() function.


-Thank you

Who knows? It's not as through "set int Transform[4][4] to be constant" means anything.
And by the way, there already is a vector in C++.... (Thank goodness for namespaces, right?)

Does "constant" mean you add the "const" keyword to it or something else?

Apparently you can't make it constant: there would be no way to initialize values in it and you can't change them later. Hence it would be useless.

You could, perhaps, place the array inside a struct/class, so you can initialize it with the result of a function that returns this array object.

Quote:

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Originally Posted by anon

Apparently you can't make it constant: there would be no way to initialize values in it and you can't change them later. Hence it would be useless.

---

Huh? Of course there's a way to initialize constant values in a class...

Quote:

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Originally Posted by Elysia

Of course there's a way to initialize constant values in a class

---

The member variable is an array, and the normal initializer syntax for arrays cannot be used in initialisation lists, if I remember correctly.

Each Sphere has its own copy of Trans; once you call SetValues on that Sphere, then it will have values in the Trans matrix. T_Inverse will go away after the function call ends.

Quote:

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Originally Posted by laserlight

The member variable is an array, and the normal initializer syntax for arrays cannot be used in initialisation lists, if I remember correctly.

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Oops, you're right. Oversight?
But then again, perhaps std::vector or std::tr1::array would work.

Ok , but why wouldn't Trans[][] hold the values assigned to it in the SetTransformMatrix()?

Quote:

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Originally Posted by armen

Ok , but why wouldn't Trans[][] hold the values assigned to it in the SetTransformMatrix()?

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It will. Why do you think it won't?

Edit: I should be more specific: I've been assuming, despite the code that you've posted, that you are in fact calling SetTransformMatrix at some point (at least via SetValues).