Question

I ‘ve problem with array in C#. I’m quite new in C# I’m used to do programs in java.
I’m trying to transfer this code from C++ to C#.
This is code in C++

typedef struct point_3d {           // Structure for a 3-dimensional point (NEW)
    double x, y, z;
} POINT_3D;

typedef struct bpatch {             // Structure for a 3rd degree bezier patch (NEW)
    POINT_3D    anchors[4][4];          // 4x4 grid of anchor points
    GLuint      dlBPatch;               // Display List for Bezier Patch
    GLuint      texture;                // Texture for the patch
} BEZIER_PATCH;

I have struct Vector3 in C# which is float x,y,z (I don’t need double …)
Now I’m trying to make structure bpatch and I have problems with the declaration of array

[StructLayout(LayoutKind.Sequential)]
struct BPatch
{
  Vector3[][] anchors = new Vector3[4][4]; //there is the problem
  uint dblPatch; // I'll probably have to change this two lines but it doesn't matter now
  uint texture; 

}

what do I do wrong?? I need aray 4×4 in structure, its type should be structure Vector3 which is declared as float x, float y, float z.
Thanks

Answer 1

In C#, Vector3[][] is not a matrix but an array of arrays. So, you will need to do this:

anchors = new Vector3[4][];
for(var i=0;i<anchors.Length;i++)
    anchors[i] = new Vector3[4];

Here’s some documentation from msdn http://msdn.microsoft.com/en-us/library/2s05feca.aspx

Another way, inline:

Vector3[][] anchors = new Vector3[][]{new Vector3[4],new Vector3[4],new Vector3[4],new Vector3[4]};

Hope it helps.