Can't register array property

Not like this. Arrays in AngelScript are dynamic objects, and not compatible with C++ static arrays. I am planning improvements to allow this to be done in the future, but it will be a while before I get it implemented.

In the meantime you can register the elements of the matrix as individual properties.

r = pASEngine->RegisterObjectProperty("matrix4x4", "float e0", offsetof(Matrix4x4, e[0])), assert( r >= 0 );r = pASEngine->RegisterObjectProperty("matrix4x4", "float e1", offsetof(Matrix4x4, e[1])), assert( r >= 0 );...

Or write a simple function to allow access to the elements. The function can be implemented as a global function so you don't have to change the C++ implementation of the Matrix4x4 class.

r = pASEngine->RegisterObjectMethod("matrix4x4", "float &e(uint)", asFUNCTION(AccessMatrixElement), asCALL_CDECL_OBJLAST); assert( r >= 0 );float *AccessMatrixElement(asUINT n, Matrix4x4 &m){  if( n > 16 )  {    asIScriptContext *ctx = asGetActiveContext();    ctx->SetException("Index out of bounds");    return 0;  }  return m.e[n]; }

Thanks Andreas. I really forgot that arrays in AngelScript won't work this way. Anyway, there are several ways to solve it. It won't be a problem.