By changing the value of the Mesh Threshold slider at the bottom of the screen, you can manipulate the threshold of the model.

Fill

Select Fill from the menu on the right and click the model to fix the threshold of the part connected with the clicked part.

The fixed part is not affected by changing the whole threshold with Mesh Threshold, and it will be fixed as it is.

Unfill on the right side menu unlocks the fixed state of the connected part threshold.

Brush

When you select Brush from the menu on the right, the brush function is activated and a circle representing the brush is displayed at the mouse position.

In that state, click or drag the model to change the threshold of the touched part.

"Brush" and "Mesh Threshold" have different values, and can be changed with the slider of the brush threshold under the menu, or the left and right of the arrow keys with the brush function activated.

You can also change the brush size by pressing the arrow keys up and down with the brush function activated.

By UnBrush, the fixed state of the threshold of the touched part is released.

Smoothing

The smoothing function can smooth the difference between fixed model thresholds.

You can select Smooth from the menu on the right side, select the application range with a circle as you do Brush, and apply smoothing.

Lasso

The lasso function allows you to delete the enclosed model.

You can undo and redo the threshold operation.

You can select it from the upper right menu and execute it, or you can also execute it by using the shortcut key (Undo: Ctrl + U, Redo: Ctrl + Y).

You can clear all fixed parts of the model by selecting ClearAll on the right side menu.