We have published the second video in a new series of Instant Terra video tutorials on the Apply curve node.
In this tutorial, an Apply curve node is applied to a Perlin noise node. We use the brush to draw a curve to change the height of each input vertex, and therefore completely change the terrain. We describe the two modes: Manual mode and Point mode, giving you maximum freedom to add, remove, and modify points to draw the curve.
We also see how the Apply curve node works in little more complex project. http://ow.ly/8xP230i0RSP (http://ow.ly/8xP230i0RSP)
(http://www.wysilab.com/forum/images/tuto_applycurve.PNG)