Self Collision is the function that prevents an object from crossing itself when the cloth is largely transformed.
Self collision=OFF,Self collision=ON
The calculation of Self Collision is performed using the surface (point) that Self Collision is specified for and the surface (polygon) that Collision Detect is set to cover. If both Self Collision and Collision Detect are specified to the same surface, Self Collision on the same surface will be calculated. Specify Self Collision and Collision Detect only to the required sections for large models since there will be more time-intensive calculation when the number of points and polygons are increased.
The calculation of Self Collision is executed between the specified points and polygons in the same way as the usual collision operation. As with regular collision operations, there can be penetration between points. This is not a good thing when you are talking about something colliding with itself. As before, we must adjust the Skin Thickness to prevent such an occurence. The calculation of Self Collision can create the collision simulation from both sides of a polygon, however, unlike the normal collision operation.
However, since there is no collision judgement for the edges of the polygons, the polygons could cross when the edges collide with each other. In this case, the Skin Thickness and the objects need to be adjusted in order to avoid the collision between the edges.