Slope analysis in Grasshopper

[archz2]

I have an autocad drawing with lots of contours. I made a terrain model of it in Rhino. How do I do slope analysis for it in Grasshopper or any other plugin for Rhino 6 /Grasshopper that helps me achieve this quickly and easily? Please provide step by step method.

I need to show slopes like

0-3% - yellow

3-10% - brown

and as slope increases, the brown colour darkness also increases. This is a reference image. That’s exactly how I want to do slope analysis.

I tried using Bison plugin but it doesn’t allow me to give data classifications like 0-10%, 10%-20%, 20-30%, 30% and above

[chanley (Chris Hanley)]

There are some discussions/examples of approaches here: (search for slope analysis will certainly turn up some more).

Grasshopper Terrain Slope in Degrees

In addition to the suggestions already given, In order to get “percent” VS “degree” you just need to do a little math in between. [SlopeAnalysis-PercentAndDegree] This example uses one custom component to explode the mesh. There are a few others around. Also, depending on the types of surfaces/meshes you are working with, I have found this to help speed things up a bit. Explode the mesh, decompose and measure against another vector(as described in other examples), then average them togethe…