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I am building a native objective-C plugin in Unity. I have a struct in unity that has the mesh data that I am trying to send to the Objective-C plugin.

My struct looks like this

public struct MeshData
{
    public float[] vertices;
    public int vertexCount;
    public int[] faces;
    public int faceCount;
    public byte[] faceClassifications;
    public float4x4 transformMatrix;
}

I looked into marshaling in C# but my plugin function doesn't get called. There is also no good documentation that explains how to do this.

Another thing I tried was to get and Intptr for the struct and then send it over to the Objective-C side but that approach failed as well.

I am not super experienced with moving pointers and converting memory to pointers in C# and then rebuilding them on the objective-C side.

How should I go about this?

Improve this question
3
  • An answer related to passing struct data to a dll was answered here. Their problem was also solved so it works as an example. Commented May 3, 2021 at 19:17
  • I don't think the answer is solving my problem, Sorry, I missed adding a very important detail in this, the arrays are variable length arrays so it is not possible to determine the actual size of the struct. Commented May 5, 2021 at 23:59
  • You will need to pass the size of the arrays as well as a pointer to the first element in the array then. Either something like this or like this. Commented May 6, 2021 at 19:38
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