ParticleReadData.cpp

array<Vector3>^ ParticleReadData::GetPositionBuffer()
{
	// get array of vectors, treat them as array of floats
	const PxVec3* p1 = this->UnmanagedPointer->positionBuffer.ptr();
	float* p = (float*)p1;

	if (p1 == NULL)
		return nullptr;

	int n = this->UnmanagedPointer->numValidParticles;
    
	// manually create new array of Vector3 taking into account stride of 8
	array<Vector3>^ arr = gcnew array<Vector3>(n);
	pin_ptr<Vector3> arrPin = &arr[0];
	int size = sizeof(Vector3);

	// copy one vector of memory worth from source array into output managed array
	for (int i = 0; i < n; i++)
	{
		int next = i * 8; // records are 8 floats apart
		memcpy_s(arrPin + i, size, p + next, size);
	}

	return arr;
	//return Util::AsManagedArray<Vector3>((void*)p, n); // old block copy
}