You will still see a vector representation of any points you enter in the (x,y,z) input boxes in the top margin. To enter a coordinate, click on the desired input box with the mouse or tab to it to make it active. Then edit the entry to whatever number you want. When you have the number correct, press the tab key to lock in that value without drawing the new vector. When x, y and z reflect the coordinates of the desired vector press the Enter key to draw the vector.
Notice that the limiting values of each variable are also now listed in the top margin of the display. You may control the limiting values by entering a new value in the appropriate input box. The scroll controls in the top margin are used for yawing and pitching the reference frame. If you have not done so, go ahead and play with these controls. They work like the scroll bar in a regular text window. Changing a limiting value redraws the drawing area. Only the last vector entrered is drawn when the limits change.
The Action and Cut buttons have no function in this particular display. The Near and Far buttons work similar to the same controls in the 2D reference frame but with one difference. In two dimensions, we chose to expand or shrink the display by looking at a smaller or larger slab of 2D space. So the actual limits were changed by the Near and Far buttons in two dimensions. In three dimensions you can move your point of view nearer to or farther from the object so that the actual limits do not need to change. In the 3D reference frame the reset button restores your point of view distance to its original value. It does not change the pitch or yaw changes you have made or erase the last entered vector. The final control is a checkbox with which you may hide or display the blue outline of the entire region of 3D space within our limits. This region, called a space cell, when made visible may aid in visualizing the objects and events being shown.
Refresh the applet to restore the original scale, viewing angles and x, y and z values.