I guess its not a problem cuz the variable is valid inside the function and cannot be used in the main program cuz its not stored anywhere.
x y z or float p[3]
Author
Well I have something like this now.
I will use it for colors too so I added the r,g,b,a too.
I will use it for colors too so I added the r,g,b,a too.
//Vector 4 Classclass Vector_4{public: union { struct { float x,y,z,w; }; struct { float r,g,b,a; }; float v[4]; }; Vector_4(){x = 0.0f; y = 0.0f; z = 0.0f; w = 1.0f;}; Vector_4(float ix,float iy,float iz,float iw = 1.0f){x = ix; y = iy; z = iz; w = iw;}; Vector_4(tVertex v) {x = v.x; y = v.y; z = v.z; w = 1.0f;}; Vector_3 vec3() const { Vector_3 v(x,y,z); return v; } float magnitude() const { return (float)sqrt((x*x) + (y*y) + (z*z)); } float &operator [](int index) { return v[index]; } Vector_4 operator=(const Vector_4& vec) { return Vector_4(x = vec.x, y = vec.y, z = vec.z,w = vec.w); } Vector_4 operator=(const Vector_3& vec) { return Vector_4(x = vec.x, y = vec.y, z = vec.z,w = 1.0f); } Vector_4 operator+(Vector_4 vector)const { return Vector_4(vector.x + x,vector.y + y,vector.z + z,vector.w + w); } Vector_4 operator-(Vector_4 vector)const { return Vector_4(x - vector.x, y - vector.y, z - vector.z); } Vector_4 operator+(float num) { return Vector_4(x + num,y + num,z + num); } Vector_4 operator*(float num) { return Vector_4(x * num,y * num,z * num); } Vector_4 operator/(float num) const { return Vector_4(x / num,y / num,z / num); } const Vector_4& operator+=(const Vector_4& vec) { x += vec.x; y += vec.y; z += vec.z; w += vec.w; return *this; } const Vector_4& operator+=(const Vector_3& vec) { x += vec.x; y += vec.y; z += vec.z; return *this; } const Vector_4& operator-=(const Vector_4& vec) { x -= vec.x; y -= vec.y; z -= vec.z; return *this; } const Vector_4 &operator*=(const float &s) { x *= s; y *= s; z *= s; return *this; } const Vector_4 &operator*=(const Vector_4& vec) { x *= vec.x; y *= vec.y; z *= vec.z; return *this; } const Vector_4 &operator/=(const float &s) { const float recip = 1/s; x *= recip; y *= recip; z *= recip; return *this; } const Vector_4 &operator+=(const float s) { x += s; y += s; z += s; return *this; } const bool operator!=(const Vector_4& vec) { if( x != vec.x&& y != vec.y&& z != vec.z) return true; else return false; } const Vector_4 operator*(const float &s) const { return Vector_4(x*s, y*s, z*s); } friend const Vector_4 operator*(const float &s, const Vector_4 &vec) { return vec*s; }};Quote:Original post by Black Knight
Doh yea unions.
Well unions share the same memory as far as i know.So Im not wasting any memory for it its the same as 3 floats?
And whats the purpose of the struct inside the class cant i just have :class Vec3{public: union{ float x,y,z; float p[3]; };};
This seems to work.
No. This means x, y, z and p[0] will all share the same memory, while only p[1] and p[2] will work as intended. This is why the struct is needed.
class Vector3
{
public:
union
{
struct { float x, y, z; };
float p[3];
};
};
Author
Hey its me again :D
After changing the my base object class' position from Vector_3 to Vector_4 I had lots of errors cuz lots of functions were taking the position as a parameter with type Vector_3.
So I added this to my Vector_4 class.
And lets say I have a base object like this:
Now I call functions like this:
findIntersection(pTerrain,pObject->getPosition().vec3);
And lots of other functions are doing the same.What else can I do?
I dont want to overload each function like
float dot(Vector_3 v1,Vector_3 v2)
float dot(Vector_4 v1,Vector_4 v2)
I thought I may use templates but sometimes I need to take the dot of a Vector_3 and a Vector_4 O_O.
Ok enought for now :=)
After changing the my base object class' position from Vector_3 to Vector_4 I had lots of errors cuz lots of functions were taking the position as a parameter with type Vector_3.
So I added this to my Vector_4 class.
class Vector_4{public: union { struct { Vector_3 vec3; float w; }; struct { float x,y,z,w; }; struct { float x,y,z,iBoneID; }; struct { float r,g,b,a; }; float v[4]; };};And lets say I have a base object like this:
class STObject{protected: Vector_4 m_vPosition;public: const Vector_4 &getPosition(){return m_vPosition;};}Now I call functions like this:
findIntersection(pTerrain,pObject->getPosition().vec3);
And lots of other functions are doing the same.What else can I do?
I dont want to overload each function like
float dot(Vector_3 v1,Vector_3 v2)
float dot(Vector_4 v1,Vector_4 v2)
I thought I may use templates but sometimes I need to take the dot of a Vector_3 and a Vector_4 O_O.
Ok enought for now :=)
Quote:Original post by Black Knight
but sometimes I need to take the dot of a Vector_3 and a Vector_4 O_O.
Um? A dot product is normally only meaningful between vectors of the same length. What kind of math are *you* doing o_O
Quote:Original post by TheOddManThere is no such "law". The so-called purists are merely morons who like to speak authoritatively.
Then again it does break the law of encapsulation, so Object-Oriented purists would say the data members *have* to be private.
This topic is closed to new replies.
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