Method getZeroMatrix

utils/cuda_utils/include/cuda_SimpleMatrixUtil.h:522–526

	}

	static inline __device__ __host__ float3x3 getZeroMatrix() {
		float3x3 res;
		res.setZero();
		return res;
	}

	static inline __device__ __host__ float3x3 getDiagonalMatrix(float diag = 1.0f) {
		float3x3 res;