Annotating the model The 3D Real-time viewer provides a range of features for annotating the 3D Real-time model. This could be particularly useful if you plan to save the current image for printing or use in presentations. The features are provided by the following buttons on the top toolbar:   The Labels button allows you to add a number of labels to the current image. Clicking on the button opens up a menu of labelling options: Click on the Add label option, then click on a structure in the model, to create a label for that structure on the image. Click on the Remove label option, then click on a label, to remove that label from the image. To change the text in a label, click on the Edit text option, then click on the label. After editing the text, click on the Label option (above Add label) to re-display the edited label. To move a label, click on the Move label option, then click on the label. You can then use your mouse to move the label to any position on the screen.   If you click on the Labels button after creating labels, the labels will be removed from the screen. Clicking on the button again will re-display the labels.     The Pins button allows you to add a number of pins to the current image. Clicking on the button opens up a menu of pin options: Click on the Add pin option, then click on a structure in the model, to create a pin on the image for that structure. Click on the Remove pin option, then click on a pin, to remove that pin from the image. Each pin has an associated label. Click on a pin to show its label; click on the pin again or on the label, to hide it. To change the text for a pin's label, click on the Edit pin option, then click on the pin or its label. After editing the text, click on the Pin option (above Add pin) to re-display the edited label.   If you click on the Pins button after creating pins, the pins and their labels will be removed from the screen. Clicking on the button again will re-display the pins and labels.     The Drawing Tool button allows you to draw a number of lines, arrows or free-form shapes on the current image. Clicking on the button opens up a menu of drawing options: Use the Line option to draw a line on the image. Use the Arrow option to draw an arrow on the image. Use the Brush option to draw a free-form shape on the image. Use the Erase option to remove a line, arrow or shape from the image, or part of a line, arrow or shape. Use the Text option to write or change text on the image. After entering or editing your text, click anywhere on the image background to complete the text item. You can click on the x icon to the right of a text item to delete it. Use the Clear option to remove all drawings from the image. Use the Color option to set the color for lines, arrows and shapes on the image. This option also allows you to vary the intensity of the color from light to dark. Use the Width option slider to set the width for lines, arrows and shapes on the image. This option also controls the amount of a line, arrow or shape removed by the Erase option. Use the Lock option to fix a drawing in place on the screen, even if you change the image. If you click on the Drawing Tool button after creating a drawing, the drawing will be removed from the screen. Clicking on the button again will re-display the drawing.