|Many of the great FlashR special effects that we see every day look very complicated but they are really created with a simple masking technique. What is a mask? Traditional artists use a masking medium to protect certain areas of a painting from the next layer of paint when it is applied. The areas covered by the masking medium do not have the new layer of paint applied and therefore, the first layer of the painting shows through these areas or openings. |
Masking techniques in Flash work much the same way. When you apply a mask to an area of the stage, only the area covered by the mask will show through and the rest of the stage will not be seen. It will take on the document's background color. One example of this technique that is commonly seen is the spotlight effect where the entire stage is blank except for a small circle. As this circle moves over the stage, you can only see what is revealed by the circle. Let's try to create that effect in this tutorial.