model://ground_plane false 1 1 1 1 world 0.1 0 <% for i in 0..1001 %> <%=i*0.4%> 0 0.05 0 0 0 true 0.2 .1 .1 0.2 .1 .1 0.07 0 0.04 0 0 0 .04 <% end %>