The Tag Plugin "Ground" simplifies the positioning of objects on uneven surfaces. You can e.g. position the trees of a forest on the XZ-plane using Cinema 4D's random function without to care for their vertical positions. "Ground" will set the correct Y-position on the basis of the assigned ground objects. All polygon objects with correctly aligned normals can be used as ground objects.

The handling is really easy: Assign the Ground tag to the object, whose Y-position is to be controlled. Or group several objects, as seen in the figure right, and assign the Ground tag to the group. In this case, activate the Apply to Children option.

Then, arrange all ground objects to a further group and drag it to the object field Ground Objects.

"Ground" works not only in the editor, but also in animations. For that simple clip which can be seen above, the object group "balls" was only moved in X-direction.

Any object outside the area of the ground objects, will be optionally set to the Y-position entered in the Base Level input field.