I have a 3d model of a site that I need to try and represent what is on site, can anyone point me to the correct place to learn how to successfully input grass and trees etc.

Hi

I am trying to create a 3D model of an old mine site. I have done a survey with a total station and created a simplified 3D outline model in Autocad which I have imported into SU as a Dxf file. I am now trying to build a model in SU using the Dxf file. I understand I need to use the CAD drawing as a platform from which I draw on top of with Sketch Up. The problem I am having is trying to draw on top of the contour lines with the freehand tool, are there are any tips to help with this. The contour lines are made up of tiny segments so cannot be selected as contours using the Sandbox tool. Any advice how to successfully trace the contour lines with SU?

Many thanks