In case you meant how to see the Dirty Virtex Paint on your Sculpt I did the following:
– select all verticies of the rock in edit mode
– go into vertex paint mode
– select Paint > Dirty Vertex Colors
– In the properties Tab go to Object Data: Here you should see by Vertex Colors an “Active Vertex Color Index” called Col. If not, add one with the plus sign and select once again Paint > Dirty Vertex Colors
– Now go to the Shader, add new material and add An Input-Node: Attribute and write the Name “Col” or whatever you have called the Active Vertex Color Index into the bottom field.
– with Node Wrangler on in your Properties you simply Shift & Ctrl Click on the node to see it and your Rock should show the Dirty Virtex Colors.
– to adjust the dirty vertex colors you can add a Color Ramp to the Attribute-Node
