So I'm new to t4 and having a blast so far! I have the pro version. I figured out how to tie a painted shader to displacement using the help page on this site. But what I really wanted was to have my painted shader remove terrain (i'd like to create a canyon) but instead it raises terrain. I couldn't find an example of removing terrain on the help page Painted Shader guide here: http://planetside.co.uk/wiki/index.php?title=Painted_Shader_Guide is there another function in T4 that allows me to dig terrain manually?
ahh silly me I just typed in a negative number and it worked. The graphical GUI did not go below zero
Glad you were able to resolve this. Terragen is pretty robust/flexible and allows values outside of the slider range to be typed into almost any input field. Sometimes this is very useful, sometimes the results are just crazy. ;) Generally the slider range tries to represent a good or reasonable range of values, but feel free to try outside of those values (except I would generally not recommend doing so on e.g. the detail/quality sliders in most cases).