Mouse Operation in Viewport

The selection and un-selection of meshes can also be performed by clicking the right mouse button in the viewport as follows:

Clicking On A Mesh

If you click on a mesh, the selection and un-selection of the mesh is switched.

Clicking On Viewport Background

If you click on the viewport background, then you can select multiple meshes by drawing a rectangle or polygon to enclose any vertices of the meshes:

• Drawing A Rectangle

  After clicking the button, keeping the button pressed and moving the mouse will draw a red rectangle.

• Drawing A Polygon

  After clicking the button, releasing it and moving the mouse to another position and then clicking the button again will draw a red line between the two clicked positions; by drawing a few lines and finally clicking the starting position will create a red polygon.