Add minimum splat size to GetMajorAxes

Assets/vfx-graph-gs/VFXGraphHLSL/GetMajorAxes.hlsl

@@ -1,3 +1,5 @@
+#define EPSILON 0.0004f
+
 /// Hidden
 float CrossProduct(float2 A, float2 B)
 {
@@ -42,5 +44,15 @@ float4x4 GetMajorAxes(float4x4 Axes, float4x4 AxesProjections)
         result[1].xyz = z_axes;
     }
 
+    if (length(result[0].xyz) < 0.0004)
+    {
+        result[0].xyz = normalize(result[0].xyz) * EPSILON;
+    }
+        
+    if (length(result[1].xyz) < 0.0004)
+    {
+        result[1].xyz = normalize(result[1].xyz) * EPSILON;
+    }
+        
     return result;
 }