How do we shift inward-pointing normal vectors (pointing towards the interior of the surface) outward? The arrows are invisble underneath the surface of the bluff body

normal(i,j,:)= cross(V2,V1)/((norm(V1)).*(norm(V2))); quiver3 (Sx,Sy,Sz,(normal(i,j,1)),(normal(i,j,2)),(normal(i,j,3)),'b'); hold on

Answer 1

[Ameer Hamza]

A simple solution is to reverse the direction of normal vector by multiplying them with -1 like this

normal(i,j,:)= cross(V2,V1)/((norm(V1)).*(norm(V2))); 
quiver3 (Sx,Sy,Sz,-(normal(i,j,1)),-(normal(i,j,2)),-(normal(i,j,3)),'b'); 
hold on