"Toan Cao" <email@example.com> wrote in message <firstname.lastname@example.org>... > Hi everyone, > I have a mesh in 3D space (consists of 3D vertices and facets). Normal vector at each vertex and normal vector of each facet are available. > If i would like to compute normal vector of a point X on mesh (X is not one of any vertices of mesh). Do you have any solution ? > I read some documents which recommend to use barycentric coordinate to interpolate normal vector of X if we know a triangle (facet) which X is inside. If so, computation is so much when we have to check every facet for X !?
Hint: The cross-product of two edges provide a normal vector.