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04. Pixels Around The Mouth

Each display is different, and some applications and displays may show the model at a smaller size than originally intended.
In this page we will address the problem of unwanted transparent pixels on a model shown in a smaller environment.


    When There Are Transparent Pixels Around the Mouth

The model at 100% seems fine, but in an environment that magnifies it to 25% of the original size, some unexpected transparency is shown around the mouth.

You can see this by zooming out 25% and looking at the bottom part of the mouth.

This is a possibility when the artwork drifts gradually into transparency which is not executed well when the pixels compact together this much.It can be seen better if you hide the face part to get a better look at how the mouth parts are functioning.
(The bottom image has the [lower lip] object set to a lower opacity so we can see the [open mouth] part beneath it)

As you can see in the texture file, the polygons highlighted in blue are at 100% opacity, but the artwork area highlighted in red has some transparent pixels at the bottom which causes the problem.
It is advised to have parts like the mouth and eyelids be completely opaque when making the artwork if it is possible.

Depending on your model and the type of artwork, this problem can be fixed by simply stretching the [lower lip] part to cover the visible parts of the [open mouth] part.

The model looks better at 25% now without having to use tools or edit the original artwork.

TIPS : Should We Just Cut Off the Transparent Parts?

In the texture edit page, you can remove the parts of the mouth that have transparent pixels,

But this method will make the object smaller, and might actually cause more problems

It's not visible at 100%, but when zoomed out at 25% you can see the unpleasant way the artwork cuts off

                                This is a close up of what the model looks like at 25% zoom                               

Objects need a slight margin to be displayed correctly, so cutting off the object and leaving no margin at all will result in unwanted behavior of the parts.

    When There Are Unwanted Pixels Around a Closed Mouth

When working on the model, a closed mouth might accidentally show what's under it because the [top lip] and [bottom lip] parts cover less area than an open mouth.

At 100% zoom, it looks fine

But at 25% zoom, we can see the [open mouth] part beneath.

We can see why this happens if we reduce the opacity of the parts above and see that the [open mouth] part is too big and overflows beyond the upper and lower lips parts. 

A simple method of fixing this problem is by changing the size of the [open mouth] part when the mouth is closed, and making it smaller to fit behind the parts above it.

    Pixels Caused By Polygon Overlap

A smiling mouth takes up more room than a frowning mouth, which means the pixels may be compacting and overlapping.

Looking at the model at 100% may look normal, but at 50% it is slightly visible, and at 15% it cannot go unnoticed.

This is caused by polygons with too much stretch that the areas between the triangles show what's hidden underneath, especially when it is not necessary to expand the object this far.
Or maybe it is a case of polygon overlap, it should be avoided at all times.

The solution is relatively simple, if the part you are working on has reasonably-spaced polygons that do not need editing,
simply stretch it back to a good size that hides what is under it.

Now the model at 25% looks much better.