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Image Warping and Grain

The blob composite is almost finished. It just needs a few finishing touches. It looks pretty good, but it would look better if the blob had some displacement so that the bathroom looked as if it were refracting through the blob. It just so happens that Shake has an IDisplace node that can do this for you. IDisplace warps an image based on a second image's intensity.

Displacement

1.
Park the Time Bar at frame 20.

2.
Insert an IDisplace node from the Warp tab between Brightness1 and the Layer1 node.

3.
Connect an output of the Inside1 node to the right input of the IDisplace1 node.

4.
Double-click on the IDisplace to view and edit it at the same time.

The xScale and yScale parameters control the amount of pixels that the image is offset by the second image.

5.
Type in -23 for xScale and 18 for yScale.

A nice displacement effect is being created, but if you really want to make it look better, you'll need to choose a different channel to create the displacement. The xChannel and yChannel parameters determine which channel from the second image is used to distort the first image.

6.
For the xChannel parameter, select G for the green channel. Do the same for yChannel.

You are now using the green channel from the second image to create the distortion.

Looking at the different channels that are being used to distort the image would be helpful. From the Parameters workspace, you can change what is seen in the Viewer by clicking on the small monitor icon by the name of the input node. You will then load that node into the current Viewer.

7.
Click on the small monitor icon next to Background.

This will allow you to view the Inside1 node, which is being used to create the displacement.

8.
Place your cursor in the Viewer and toggle through the channels with the R, G, B, and A keys. Finish with the C key to view the RGB channels.

In contrast to the alpha channel, the green channel has more gray tones, which results in a smoother displacement effect.

9.
Click on the small monitor icon next to nodeName to view the IDisplace1 node by itself.

NOTE

If you double-click on one of the small monitor icons in the Parameters workspace, you also load that node's parameters.

10.
Scroll through the animation with the Time Bar.

This looks pretty good, but what happens when you view the composite through the Layer1 node?

11.
Double-click on the Layer1 node and scroll through the animation with the Time Bar again.

When you view the Layer1 node, you can see that much of the displacement effect has been lost. It would help to mix some of the blob out and reveal more of the displacement. You can do this with the Mix node. Mix blends two images together according to a percentage.

12.
Insert a Mix function from the Layer tab after Layer1 and connect the output of the IDisplace1 node to the right input of the Mix1 node.

13.
Set the percent parameter to 20.

14.
Scroll through the animation with the Time Bar.

You're almost done.


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