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Noise Around Mouth

When you look at the completed model with changing the magnification of the display, you may find noise around the mouth of the model.
This is an explanation how to deal with it.

In case there is noise around mouth

Although noise may not be visible when model is displayed with the 100% scale, it may become visible around mouth if you change the display scale to 25%.
100%25%

Below is enlarged view. You can see some noise around the jaw.


The drawable object of the lower lip is as below, and you will find that the part of inside mouth is right up to the lower lip.
In this case, there is a possibility to be noise around this area.
(In the image below, the opacity of the drawable object of the lower lip is decreased.)

If you see the polygons from "Edit Texture", you will find that the polygons (painted in red in the image below) which have transparent pixels are used.
It is desirable that the polygons to hide the part in the rear are completely opaque polygons which have no transparency pixels.

You can solve this problem by adjusting the shape of polygons to hide the parts in the rear with opaque pixels.

You will find no noise with the display of 25%.


Tips: Is it alright as long as to cover the part with opaque polygons?


Let's take up an example of a object

Although the parts in the rear are covered with the opaque polygons, this is not good as they are right up to the lower lip.


You will find that there are noise with the display of 25%.

100%25% 

To enlarge the display of 25% 

This means that it is not alright if you cover the parts in the rear with opaque polygons.

Remember to cover the parts in the rear with some margins remained.



In case there is noise around closed mouth

You may find noise around the mouth which is closed in some cases.

There seems no problem if you see the display with the magnification of 100%,

however you may find noise around the mouth of the model if you change it to 25%.

If you see the drawable object, you will find that the drawable objects to hide inside of the mouth are right up to the lips.

As the inside of the mouth should not be seen with the closed mouth, so you need to create it small enough with sufficient margins remained.


In case there is a linear noise

It is a kind of phenomenon to happen quite often when you deform the shape of mouth from "smiling mouth" (the guide image) to "downturned mouth" (mouth turned down at the corners).
 

There seems no problem if you see the display with the magnification of 100%, however you may find linear noise around the middle of the lower lip if you change it to 50% or 25%.
100%50%25%

This is because the polygons are extremely stretched out for deformation as below.
The parts in the rear may be seen if the polygons in front are stretched out or diminished too much.

You can solve this problem to create them not to be stretched out as below.

Now you find no noise with the display of 25%.

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