3-Point Perspective
Best viewed on desktop
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How to Use the Grid:
To rotate the viewpoint simply click and drag anywhere on the screen. You will see exactly how much you are rotating by looking at the Horizontal and Vertical degrees of rotation at the top of the screen. 
To change the field of view of the projection drag the slider at the top of the screen. The equivalent length of a camera lens is shown to the right of the slider in millimeters. 
The viewport frame can be turned on and off and switched between 16:9 and 2.35:1 aspect ratios with the tools on the left. A letterbox can also be turned on to highlight only the picture frame.
Use the scaling sliders located around the picture frame to manipulate the heigh and size of the grids. These tools can be turned on and off with the Show/Hide Scaling Tools button in the top right of the screen.​​​​​​​

Other Options:
VPs: This shows the connection between the three visible vanishing points that are useful when drafting on paper.
Cube: A visual aide.
Scale Grid 1 & 2: All squares created by the gridlines and contained within the red boundary are to scale.
Grid Extensions: These Grid lines are not to scale and are there to act as guidelines outside of the scale grids.
Verticals: These Vertical lines originate from the vanishing points below and above the viewer. They are not to scale.
Center Axes: These denote the center of the frame and are used in the construction of the projection.
Projection Points: Also used in the construction, these points allow the measurement of angles along the horizon as well as vertically.
Structure: Contains the elements of how the projection was constructed.
Rotate Projection/Move View: Switch between the ability to rotate the grid and the ability to track sideways. (This only works on the non-embedded version on Geogebra.org.
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