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According to the Bryce manual, noise is the background turbulence used to create patterns for textures. It's very similar to the noise or snow you sometimes get on your TV. You use the Noise Editor to create noise from scratch. From here, you can increase or decrease the amount of noise in the texture, change its direction, and set the number of axes the noise is applied to, among other things.

In the Noise Editor, look at the "Type." You should have "Leopard" listed. If you don't, click on the noise type to get a list of the different types of noise you can use and select "Leopard." Beneath Type is "Mode." Click on the mode and select "Standard" from the list that appears. At the very bottom of the Noise Editor are the options for 1D, 2D, and 3D. Select the 2D option. Look under "Direction". For this example, we want our rain to go up and down, so set both the XY and the YZ values to "0". Now look underneath "Frequency." Set the X value to around "900", the Y value to around "30", and the Z value to around "550". You can do this by click/dragging the mouse cursor over the numbers or by clicking on the little arrows to either side of the numbers. Your Noise Editor should now look similar to the picture below. Once you've made these changes, click on the check mark at the bottom of the Noise Editor to close it.

Noise settings for Component 1.

The next thing we need to do is set up the Phase for Component 1. Phase creates turbulence in the noise. Open the Phase Palette by clicking on the Phase button at the bottom of the DTE. Make sure the first spot at the top of the palette is selected.

The Phase Palette.

Click on the green button in the upper left corner of the Phase Palette to open the Phase Editor (the button will turn green when you pass your mouse over it). You'll notice the Phase Editor looks just like the Noise Editor. Since we're trying to create straight up and down rain, we don't really need any phase. So set the Type to "Nothing," the Mode to "Standard," and all the other settings to "0." Your Phase Editor should look like the picture below. Click the check mark at the bottom when you're done.

Phase settings for Component 1.

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