/* fast version: ~80-90ms */
class Block
{
  public:
  	float3x3 m;
	short r,c;
	Block(){}
	Block(short _r,short _c):r(_r),c(_c){}
};


/* slow version: ~150ms. but notice: i don't even use the additional variables! */
class Block
{
  public:
  	float3x3 m;
	int ndof;
	int pinned;
	float3 v1,v2,v3;
	short r,c;
	Block(){}
	Block(short _r,short _c):r(_r),c(_c){}
};