1 files changed, 10 insertions, 0 deletions
diff --git a/linalg.h b/linalg.h
index 8362ab1..593aa9d 100644
--- a/linalg.h
+++ b/linalg.h
@@ -1,6 +1,11 @@
 #ifndef __LINALG_H__
 #define __LINALG_H__
 
+__device__ __host__ float3 operator- (const float3 &a)
+{
+	return make_float3(-a.x, -a.y, -a.z);
+}
+
 __device__ __host__ float3 operator+ (const float3 &a, const float3 &b)
 {
 	return make_float3(a.x+b.x, a.y+b.y, a.z+b.z);
@@ -103,4 +108,9 @@ __device__ __host__ float3 cross(const float3 &a, const float3 &b)
 	return make_float3(a.y*b.z-a.z*b.y, a.z*b.x-a.x*b.z, a.x*b.y-a.y*b.x);
 }
 
+__device__ __host__ float norm(const float3 &a)
+{
+	return sqrtf(dot(a,a));
+}
+
 #endif