Using Scale Maps

Step One
For this tutorial we are going to use one texture to scale another. First we must add a texture to use as the scale map. Here we are going to use a linear gradient so add IFW2_Gradient to the surface and select linear. Make the linear gradient run from the top of the object to the bottom with a single repeat as shown in the figure on the left.
Step Two
To make the scale map more interesting we are going to add some noise. This is done by increasing the noise magnitude. Play with this and the noise scaling until you get a pattern similar to the one shown on the left. Also, turn off any bump control by setting the bump to 0.0.
Step Three
Next disable the gradient texture so its no longer displayed and add IFW2_Noise after the IFW2_Gradient texture. Select fBm and by using a blue to white to grey gradient create a fluffy cloud effect. This is shown in the figure to the left. Again turn off the bump settings for the texture.
Step Four
Finally, we are going to use the original linear gradient to scale the clouds and create a swirling atmosphere so first re-enable the linear gradient and uncheck the color disable buttons. Then go to the fBm cloud texture and check the Scale Layer check box. Then set the lower scale to 0.1 and the upper scale to 1.0 for the X, Y and Z axes. The final result of the clouds scaled by the noisy linear texture is shown in the figure to the left.
Top Tips
When the Scale Layer check box is enabled the IFW2 texture preview uses a linear gradient going from left to right to control the scaling. Use the to set up the X, Y and Z scaling for a quick preview of the scaling range.


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