Main object of this blog post is to give you an idea about what are normals, where are they used, locked v/s unlocked concept and reverse normals issues.



Step 1 Understanding of Normals

What is a Normal:In Computer graphics normal are direction or orientation of an object’s surface toward light. Following is a example of how normals are seen in Maya.



Step 2 Setup of Normal

To view the normal in Maya, go to Normals >> vertex edit normals tool. Every vertex has its own normal. Normals define how model’s surface will be affect by light source.

Normals also define the whether an polygon of given object will face outward or inward. Normals are also come to use when we need surface of an object look smooth or sharp.

See below for an example.


Step 3 Degree of Normals



3.1 Normal Unified

The Object on the left has its normal angle set at 180 degrees while the object on the right has its normal angle set at 0 degrees. In other words object on left has its normal unified and that is why it looks smooth. Object on left has its normal broken-up and that’s why it look sharper on adjacent edges.


3.2 Normal Broken-Up


Sometime what you can see of a model is its silhouette because of inverted normals or normals facing another side of camera.


Step 4 Reverse The Normals

How to reverse the normals

Select: Half Sphere >> display >> polygons >> Face normals


Here in above image objects normal are facing inside of it, hence you are not able to see it from outer side. Next, go to Normals >> Reverse




4.1 Flipped Normals

We can see in above image that all normals of each faces are flipped toward outside and now you can’t see it from inside.


Step 5 Vertex Normal Edit Tool

Go to Normals >> vertex normal edit tool


In this example some normals of cylinder are going the outwards and the other couple of normals going the inwards. The vertices along the edges have two normals.


5.1 Direction Of Vertex Normal


To solve this uneven normals direction, right click of object >> select vertex face. Each face has its own set of four vertices. Click on one of the face vertices and you will see that on one side the vertices are reversed and on the opposite side they're going the right way.


5.2 To Solve Uneven Normal Direction


I hope you find this blog very helpful while working with Normals in Maya. Let me know in comment if you have any questions regarding Maya. I will help you ASAP.

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