Color slope map with class breaks

[tredegar82]

Hi everyone,

I have a 3d terrain created from contours imported from Autocad to Sketchup. I was wondering if it was possible to use this terrain to create a slope map with different colors according to different slopes, and be able to specify the number of classes, colors and break values like in ArcGIS or Civil 3D (but in Sketchup, which is much more affordable...)
For instance:

0-19 % (could also be in degrees, or maybe would have choice between % and deg) = green
20-29% = yellow
30-40% = red
40-100% = purple

I know that there is already a plugin called Color by Slope, which is already great, but I was wondering if it was possible to have something more precise for slope analysis.

Thank you everyone, any help is much appreciated!

Philippe