Trying to Understand Why Random Edges Fixed My Shading Problem. Can someone please help?

[Deb kanta Guin]

Can anyone explain the logic behind this? I was having a bad shading issue, but then I created and joined these vertices, added three edges, and the shading issue kind of disappeared from the actual mesh side not totally from the mirror side. I know that sometimes shading issues go away when we add more edges, delete some, or dissolve vertices — I’ve done that before. But in this case, it felt kind of random and the place feels random to me because one side issue kind of solved but not on the mirror side, also it’s not even quads, just triangles. So what’s the logic here? Can anyone please explain?
What could i have done better? or what should i do to fix this issue? Trying to solve this for 7 hrs by myself but i give up..with the little knowledge I have I cant atm.

[Dwayne Savage]

It has to do with the normal to surface ratio. This is why in quad modeling you they say to try and keep it even spacing with square faces. Think of it like this. from each vertex to the center of the face(The normal’s tangent point) is used to calculate the shading. When using smooth shading it creates something similar to a gradient. Not really, but it makes it easier to visualize. Thus long rectangular face that is inset will cause shifts in the shading. In most cases this can be hidden with textures and is more noticeable  with a MatCap. You could remove the the 3 edges you added and add a few loop cuts. Something like this:

Also make sure you don’t have doubles.

[Martin Bergwerf]

And you can also try to Toggle  Harden Normals, in the Shading dropdown in the Bevel Modifier. Sometimes it helps and sometimes it makes oit worse.

[Deb kanta Guin]

@dillenbata3 Thank u mate for this solid info..
@spikeyxxx Thank u too mate…u always help…

[Deb kanta Guin]

Solved 
Thank u very much guys @dillenbata3 your knowledge really help me a lot 
also @spikeyxxx mate…damn that was solving the issue by one click but I am using a solidify modifier that’s causing a different problem in another area after using harden normals..thank u 
I just add these edges and it solved 99.99%

[Martin Bergwerf]

The Solidify Modifier also has Settings, that might help (they are off by default):

[Deb kanta Guin]

@spikeyxxx I tried those but not worked in my case…but thank u anyway for showing me some very useful settings….😊😊

[Martin Bergwerf]

It is also possible, with those angles that your model has, that you’d need to switch the Siolidify Mode  from Simple to Complex…..it really depends on the kind of problems you have.

[Deb kanta Guin]

@spikeyxxx Okay noted will try it too…Thanks a bunch…

[Dwayne Savage]

@spikeyxxx I haven’t used Harden normals before. I’ll have to play around with that. 

[Martin Bergwerf]

Dwayne @dillenbata3 ,

Jonathan Lampel mentions this in the Fundamentals of Mesh Modeling: https://cgcookie.com/lessons/the-3-ways-to-bevel 

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