Material glows when zoomed (three.js r78)
When scaling to a certain extent, the material of objects behind other objects begins to shine. It is very similar to the effect when the faces overlap (the faces are in the same plane).
To demonstrate this, I made a violin .
In this example, I draw two thin boxes (thickness 1 and the empty space between the drawers is also 1) so that the drawers do not touch each other, but the material still shines.
// geometry with thickness 1
var geometry = new THREE.BoxGeometry(20000, 20000, 1);
This screenshot shows the effect:

This screenshot shows that there is a space between the two geometries.

When the effect is displayed simultaneously, it sometimes appears and sometimes disappears (this also depends on the zoom distance and screen size).
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