Index: TRBS/Makefile
===================================================================
--- TRBS/Makefile	(revision 541)
+++ TRBS/Makefile	(revision 542)
@@ -1,5 +1,5 @@
 DPI=300
-PICS = 2net.png 3net.png passthru1.png passthru2.png passthru3.png tri.png
+PICS = 2net.png 3net.png passthru1.png passthru2.png passthru3.png tri.png uturn.png
 
 all: $(PICS)
 
Index: TRBS/trbs.html
===================================================================
--- TRBS/trbs.html	(revision 541)
+++ TRBS/trbs.html	(revision 542)
@@ -83,7 +83,16 @@
 be any number of crossings, from zero up, but any time the 2net is crossing
 a triangulation edge, there must be a crossing created.
 <p>
-Note: multiple crossing points of the same 2net-edge can occur [TODO: drawing].
+Note: multiple crossing points of the same 2net-edge can occur, as shown on
+Figure 3.
+	<center>
+	<p><br>&nbsp;<br>&nbsp;
+	<p><img src="uturn.png" alt="repeated crossings" width="500px">
+	<p><i>Figure 3: the blue net between A and B need to make detours around
+	      other (blue) nets. On the way, it crosses some edges (marked with red)
+	      twice, at different locations.</i>
+	<p><br>&nbsp;<br>&nbsp;
+	</center>
 <p>
 Each <b>2net</b> is specified by a starting and an ending triangulation
 vertex and an ordered doubly linked list of crossings. Which
@@ -140,7 +149,7 @@
 	<center>
 	<p><br>&nbsp;<br>&nbsp;
 	<p><img src="passthru1.png" alt="in-triangle visibility algorithm" width="500px">
-	<p><i>Figure 3: edge-to-edge visibility in a triangle; annotations are
+	<p><i>Figure 4: edge-to-edge visibility in a triangle; annotations are
 	   drawn with red, existing paths with blue</i>
 	<p><br>&nbsp;<br>&nbsp;
 	</center>
@@ -150,7 +159,7 @@
 inserted between edge end vertices or existing crossings). In case of target
 vertex, the output is a boolean, whether that vertex is visible or not.
 <p>
-The algorithm for determining visibility (e.g. on Figure 3) is:
+The algorithm for determining visibility (e.g. on Figure 4) is:
 <p>
 <ul>
 	<li> 1. start walking the triangle (edge) from the entering point in
@@ -189,16 +198,16 @@
 	<center>
 	<p><br>&nbsp;<br>&nbsp;
 	<p><img src="passthru2.png" alt="visibility example in a triangle" width="500px">
-	<p><i>Figure 4: blue and green nets starting from triangle vertices, still
+	<p><i>Figure 5: blue and green nets starting from triangle vertices, still
 	      S2 finds its target edge point</i>
 	<p><br>&nbsp;<br>&nbsp;
 	</center>
 <p>
-On Figure 4, a CW search from S2 first reaches vertex PA then will jump to the edge PA-PC,
+On Figure 5, a CW search from S2 first reaches vertex PA then will jump to the edge PA-PC,
 which is the target edge.
 
 <p> Case 2:
-On Figure 4, tracing CCW from S2: because of 3b., the search reaches target edge after
+On Figure 5, tracing CCW from S2: because of 3b., the search reaches target edge after
 tracing S2's edge, vertex PB and the blue path.
 
 <p> Case 3: visibility blocked
@@ -206,10 +215,10 @@
 	<center>
 	<p><br>&nbsp;<br>&nbsp;
 	<p><img src="passthru3.png" alt="visibility blocked in a triangle" width="500px">
-	<p><i>Figure 5: target edge not visible from S2 because of an existing path</i>
+	<p><i>Figure 6: target edge not visible from S2 because of an existing path</i>
 	<p><br>&nbsp;<br>&nbsp;
 	</center>
 <p>
-On Figure 5, starting from S2, tracing CCW: trace S2's edge to PB, then switch edge
+On Figure 6, starting from S2, tracing CCW: trace S2's edge to PB, then switch edge
 by 3c, bumping into the blue path by 4, tracing it to edge PA-PB;
 this edge is the edge S2 is on. By 5, return failure.
Index: TRBS/uturn.lht
===================================================================
--- TRBS/uturn.lht	(nonexistent)
+++ TRBS/uturn.lht	(revision 542)
@@ -0,0 +1,587 @@
+ha:pcb-rnd-board-v7 {
+
+ li:styles {
+    ha:normal {
+     diameter = 2.2mm
+     text_scale = 200
+     text_thick = 1.0mm
+     thickness = 1.0mm
+     hole = 2.0mm
+     clearance = 20.0mil
+    }
+    ha:thick {
+     diameter = 2.2mm
+     text_scale = 0
+     text_thick = 0.0
+     thickness = 1.7mm
+     hole = 1.0mm
+     clearance = 20.0mil
+    }
+    ha:thin {
+     diameter = 137.8mil
+     text_scale = 0
+     text_thick = 0.0
+     thickness = 0.35mm
+     hole = 47.24mil
+     clearance = 25.0mil
+    }
+     ha:realthin {
+      diameter = 275.6mil
+      text_scale = 100
+      text_thick = 0.0
+      thickness = 0.25mm
+      hole = 47.24mil
+      clearance = 25.0mil
+     }
+ }
+
+ ha:meta {
+   ha:size {
+    thermal_scale = 0.500000
+    x = 51.0mm
+    y = 40.0mm
+   }
+   ha:grid {
+    spacing = 0.25mm
+    offs_x = 0.0
+    offs_y = 0.0
+   }
+ }
+
+ ha:data {
+  li:padstack_prototypes {
+
+   ha:ps_proto_v6.0 {
+     hdia=31.5mil; hplated=1; htop=0; hbottom=0;
+     li:shape {
+
+       ha:ps_shape_v4 {
+        ha:ps_circ { x=0.0; y=0.0; dia=2.0mm;        }
+        ha:combining {        }
+        ha:layer_mask {
+         copper = 1
+         top = 1
+        }
+        clearance=0.0
+       }
+
+       ha:ps_shape_v4 {
+        ha:ps_circ { x=0.0; y=0.0; dia=2.0mm;        }
+        ha:combining {        }
+        ha:layer_mask {
+         bottom = 1
+         copper = 1
+        }
+        clearance=0.0
+       }
+
+       ha:ps_shape_v4 {
+        ha:ps_circ { x=0.0; y=0.0; dia=2.0mm;        }
+        ha:combining {        }
+        ha:layer_mask {
+         copper = 1
+         intern = 1
+        }
+        clearance=0.0
+       }
+     }
+   }
+
+    ha:ps_proto_v6.1 {
+      hdia=47.24mil; hplated=1; htop=0; hbottom=0;
+      li:shape {
+
+        ha:ps_shape_v4 {
+         ha:ps_circ { x=0.0; y=0.0; dia=137.8mil;         }
+         ha:combining {         }
+         ha:layer_mask {
+          copper = 1
+          top = 1
+         }
+         clearance=0.0
+        }
+
+        ha:ps_shape_v4 {
+         ha:ps_circ { x=0.0; y=0.0; dia=137.8mil;         }
+         ha:combining {         }
+         ha:layer_mask {
+          bottom = 1
+          copper = 1
+         }
+         clearance=0.0
+        }
+
+        ha:ps_shape_v4 {
+         ha:ps_circ { x=0.0; y=0.0; dia=137.8mil;         }
+         ha:combining {         }
+         ha:layer_mask {
+          copper = 1
+          intern = 1
+         }
+         clearance=0.0
+        }
+      }
+    }
+
+    ha:ps_proto_v6.2 {
+      hdia=2.0mm; hplated=1; htop=0; hbottom=0;
+      li:shape {
+
+        ha:ps_shape_v4 {
+         ha:ps_circ { x=0.0; y=0.0; dia=2.2mm;         }
+         ha:combining {         }
+         ha:layer_mask {
+          copper = 1
+          top = 1
+         }
+         clearance=0.0
+        }
+
+        ha:ps_shape_v4 {
+         ha:ps_circ { x=0.0; y=0.0; dia=2.2mm;         }
+         ha:combining {         }
+         ha:layer_mask {
+          bottom = 1
+          copper = 1
+         }
+         clearance=0.0
+        }
+
+        ha:ps_shape_v4 {
+         ha:ps_circ { x=0.0; y=0.0; dia=2.2mm;         }
+         ha:combining {         }
+         ha:layer_mask {
+          copper = 1
+          intern = 1
+         }
+         clearance=0.0
+        }
+      }
+    }
+  }
+
+   li:objects {
+   }
+   li:layers {
+
+    ha:triangulation {
+     lid=0
+     group=3
+     ha:combining {     }
+
+      li:objects {
+       ha:line.48 {
+        x1=1.0mm; y1=1.0mm; x2=1.0mm; y2=38.0mm; thickness=0.35mm; clearance=50.0mil;
+        ha:flags {
+         clearline=1
+        }
+       }
+       ha:line.51 {
+        x1=1.0mm; y1=38.0mm; x2=49.0mm; y2=38.0mm; thickness=0.35mm; clearance=50.0mil;
+        ha:flags {
+         clearline=1
+        }
+       }
+       ha:line.54 {
+        x1=49.0mm; y1=38.0mm; x2=49.0mm; y2=1.0mm; thickness=0.35mm; clearance=50.0mil;
+        ha:flags {
+         clearline=1
+        }
+       }
+       ha:line.57 {
+        x1=49.0mm; y1=1.0mm; x2=1.0mm; y2=1.0mm; thickness=0.35mm; clearance=50.0mil;
+        ha:flags {
+         clearline=1
+        }
+       }
+       ha:line.75 {
+        x1=1.0mm; y1=1.0mm; x2=3.0mm; y2=16.0mm; thickness=0.35mm; clearance=50.0mil;
+        ha:flags {
+         clearline=1
+        }
+       }
+       ha:line.78 {
+        x1=3.0mm; y1=16.0mm; x2=1.0mm; y2=38.0mm; thickness=0.35mm; clearance=50.0mil;
+        ha:flags {
+         clearline=1
+        }
+       }
+       ha:line.81 {
+        x1=1.0mm; y1=38.0mm; x2=25.0mm; y2=33.0mm; thickness=0.35mm; clearance=50.0mil;
+        ha:flags {
+         clearline=1
+        }
+       }
+       ha:line.84 {
+        x1=25.0mm; y1=33.0mm; x2=49.0mm; y2=38.0mm; thickness=0.35mm; clearance=50.0mil;
+        ha:flags {
+         clearline=1
+        }
+       }
+       ha:line.87 {
+        x1=49.0mm; y1=38.0mm; x2=46.0mm; y2=20.0mm; thickness=0.35mm; clearance=50.0mil;
+        ha:flags {
+         clearline=1
+        }
+       }
+       ha:line.90 {
+        x1=46.0mm; y1=20.0mm; x2=49.0mm; y2=1.0mm; thickness=0.35mm; clearance=50.0mil;
+        ha:flags {
+         clearline=1
+        }
+       }
+       ha:line.93 {
+        x1=49.0mm; y1=1.0mm; x2=25.0mm; y2=3.0mm; thickness=0.35mm; clearance=50.0mil;
+        ha:flags {
+         clearline=1
+        }
+       }
+       ha:line.96 {
+        x1=25.0mm; y1=3.0mm; x2=1.0mm; y2=1.0mm; thickness=0.35mm; clearance=50.0mil;
+        ha:flags {
+         clearline=1
+        }
+       }
+       ha:line.99 {
+        x1=1.0mm; y1=1.0mm; x2=16.0mm; y2=20.0mm; thickness=0.35mm; clearance=50.0mil;
+        ha:flags {
+         clearline=1
+        }
+       }
+       ha:line.102 {
+        x1=16.0mm; y1=20.0mm; x2=3.0mm; y2=16.0mm; thickness=0.35mm; clearance=50.0mil;
+        ha:flags {
+         clearline=1
+        }
+       }
+       ha:line.105 {
+        x1=16.0mm; y1=20.0mm; x2=1.0mm; y2=38.0mm; thickness=0.35mm; clearance=50.0mil;
+        ha:flags {
+         clearline=1
+        }
+       }
+       ha:line.108 {
+        x1=16.0mm; y1=20.0mm; x2=25.0mm; y2=33.0mm; thickness=0.35mm; clearance=50.0mil;
+        ha:flags {
+         clearline=1
+        }
+       }
+       ha:line.111 {
+        x1=16.0mm; y1=20.0mm; x2=31.0mm; y2=16.0mm; thickness=0.35mm; clearance=50.0mil;
+        ha:flags {
+         clearline=1
+        }
+       }
+       ha:line.114 {
+        x1=25.0mm; y1=3.0mm; x2=31.0mm; y2=16.0mm; thickness=0.35mm; clearance=50.0mil;
+        ha:flags {
+         clearline=1
+        }
+       }
+       ha:line.117 {
+        x1=25.0mm; y1=33.0mm; x2=31.0mm; y2=16.0mm; thickness=0.35mm; clearance=50.0mil;
+        ha:flags {
+         clearline=1
+        }
+       }
+       ha:line.120 {
+        x1=31.0mm; y1=16.0mm; x2=46.0mm; y2=20.0mm; thickness=0.35mm; clearance=50.0mil;
+        ha:flags {
+         clearline=1
+        }
+       }
+       ha:line.123 {
+        x1=31.0mm; y1=16.0mm; x2=49.0mm; y2=38.0mm; thickness=0.35mm; clearance=50.0mil;
+        ha:flags {
+         clearline=1
+        }
+       }
+       ha:line.126 {
+        x1=31.0mm; y1=16.0mm; x2=49.0mm; y2=1.0mm; thickness=0.35mm; clearance=50.0mil;
+        ha:flags {
+         clearline=1
+        }
+       }
+       ha:line.129 {
+        x1=16.0mm; y1=20.0mm; x2=25.0mm; y2=3.0mm; thickness=0.35mm; clearance=50.0mil;
+        ha:flags {
+         clearline=1
+        }
+       }
+      }
+      color = {#757575}
+    }
+
+    ha:ratlines {
+     lid=1
+     group=4
+     ha:combining {     }
+
+      li:objects {
+      }
+      color = {#d3a232}
+    }
+
+     ha:wires {
+      lid=2
+      group=5
+      ha:combining {      }
+
+       li:objects {
+        ha:line.259 {
+         x1=3.0mm; y1=16.0mm; x2=10.5mm; y2=13.0mm; thickness=0.35mm; clearance=50.0mil;
+         ha:flags {
+          clearline=1
+         }
+        }
+        ha:line.262 {
+         x1=10.5mm; y1=13.0mm; x2=19.75mm; y2=13.0mm; thickness=0.35mm; clearance=50.0mil;
+         ha:flags {
+          clearline=1
+         }
+        }
+        ha:line.265 {
+         x1=19.75mm; y1=13.0mm; x2=30.5mm; y2=14.5mm; thickness=0.35mm; clearance=50.0mil;
+         ha:flags {
+          clearline=1
+         }
+        }
+        ha:line.268 {
+         x1=30.5mm; y1=14.5mm; x2=32.25mm; y2=15.0mm; thickness=0.35mm; clearance=50.0mil;
+         ha:flags {
+          clearline=1
+         }
+        }
+        ha:line.271 {
+         x1=32.25mm; y1=15.0mm; x2=32.5mm; y2=16.25mm; thickness=0.35mm; clearance=50.0mil;
+         ha:flags {
+          clearline=1
+         }
+        }
+        ha:line.274 {
+         x1=32.5mm; y1=16.25mm; x2=32.25mm; y2=17.5mm; thickness=0.35mm; clearance=50.0mil;
+         ha:flags {
+          clearline=1
+         }
+        }
+        ha:line.277 {
+         x1=32.25mm; y1=17.5mm; x2=29.75mm; y2=19.5mm; thickness=0.35mm; clearance=50.0mil;
+         ha:flags {
+          clearline=1
+         }
+        }
+        ha:line.292 {
+         x1=29.75mm; y1=19.5mm; x2=22.25mm; y2=18.25mm; thickness=0.35mm; clearance=50.0mil;
+         ha:flags {
+          clearline=1
+         }
+        }
+        ha:line.295 {
+         x1=22.25mm; y1=18.25mm; x2=17.25mm; y2=17.75mm; thickness=0.35mm; clearance=50.0mil;
+         ha:flags {
+          clearline=1
+         }
+        }
+        ha:line.298 {
+         x1=17.25mm; y1=17.75mm; x2=14.5mm; y2=18.0mm; thickness=0.35mm; clearance=50.0mil;
+         ha:flags {
+          clearline=1
+         }
+        }
+        ha:line.301 {
+         x1=14.5mm; y1=18.0mm; x2=13.25mm; y2=19.0mm; thickness=0.35mm; clearance=50.0mil;
+         ha:flags {
+          clearline=1
+         }
+        }
+        ha:line.304 {
+         x1=13.25mm; y1=19.0mm; x2=1.0mm; y2=37.75mm; thickness=0.35mm; clearance=50.0mil;
+         ha:flags {
+          clearline=1
+         }
+        }
+        ha:line.307 {
+         x1=31.0mm; y1=16.0mm; x2=18.75mm; y2=15.25mm; thickness=0.35mm; clearance=50.0mil;
+         ha:flags {
+          clearline=1
+         }
+        }
+        ha:line.310 {
+         x1=18.75mm; y1=15.25mm; x2=12.75mm; y2=15.5mm; thickness=0.35mm; clearance=50.0mil;
+         ha:flags {
+          clearline=1
+         }
+        }
+        ha:line.313 {
+         x1=12.75mm; y1=15.5mm; x2=8.5mm; y2=17.75mm; thickness=0.35mm; clearance=50.0mil;
+         ha:flags {
+          clearline=1
+         }
+        }
+        ha:line.316 {
+         x1=8.5mm; y1=17.75mm; x2=2.75mm; y2=18.5mm; thickness=0.35mm; clearance=50.0mil;
+         ha:flags {
+          clearline=1
+         }
+        }
+        ha:line.319 {
+         x1=16.0mm; y1=20.0mm; x2=28.25mm; y2=24.25mm; thickness=0.35mm; clearance=50.0mil;
+         ha:flags {
+          clearline=1
+         }
+        }
+        ha:line.322 {
+         x1=28.25mm; y1=24.25mm; x2=37.25mm; y2=23.75mm; thickness=0.35mm; clearance=50.0mil;
+         ha:flags {
+          clearline=1
+         }
+        }
+        ha:line.325 {
+         x1=37.25mm; y1=23.75mm; x2=46.0mm; y2=20.0mm; thickness=0.35mm; clearance=50.0mil;
+         ha:flags {
+          clearline=1
+         }
+        }
+        ha:line.337 {
+         x1=2.75mm; y1=18.5mm; x2=1.75mm; y2=11.75mm; thickness=0.35mm; clearance=50.0mil;
+         ha:flags {
+          clearline=1
+         }
+        }
+        ha:line.340 {
+         x1=1.75mm; y1=11.75mm; x2=1.0mm; y2=1.25mm; thickness=0.35mm; clearance=50.0mil;
+         ha:flags {
+          clearline=1
+         }
+        }
+       }
+       color = {#104e8b}
+     }
+
+     ha:annotation {
+      lid=3
+      group=6
+      ha:combining {      }
+
+       li:objects {
+        ha:line.334 {
+         x1=9.25mm; y1=11.5mm; x2=15.0mm; y2=18.75mm; thickness=0.15mm; clearance=50.0mil;
+         ha:flags {
+          clearline=1
+         }
+        }
+        ha:line.343 {
+         x1=20.75mm; y1=11.0mm; x2=16.5mm; y2=19.0mm; thickness=0.25mm; clearance=50.0mil;
+         ha:flags {
+          clearline=1
+         }
+        }
+        ha:text.346 {
+         string=A; x=3.25mm; y=13.75mm; scale=100; fid=0;
+         ha:flags {
+          clearline=1
+         }
+         rot = 0.000000
+        }
+        ha:text.347 {
+         string=B; x=1.0mm; y=38.5mm; scale=100; fid=0;
+         ha:flags {
+          clearline=1
+         }
+         rot = 0.000000
+        }
+       }
+       color = {#cd3700}
+     }
+   }
+ }
+
+ ha:layer_stack {
+  li:groups {
+   ha:0 {
+    name = grp_4
+    ha:type { substrate=1; intern=1;    }
+    li:layers {    }
+    ha:attributes {
+     thickness={0.7375mm }
+    }
+   }
+   ha:1 {
+    name = grp_6
+    ha:type { substrate=1; intern=1;    }
+    li:layers {    }
+    ha:attributes {
+     thickness={0.125mm }
+    }
+   }
+   ha:2 {
+    name = grp_8
+    ha:type { substrate=1; intern=1;    }
+    li:layers {    }
+    ha:attributes {
+     thickness={0.7375mm }
+    }
+   }
+   ha:3 {
+    name = top-doc
+    ha:type { top=1; doc=1;    }
+    li:layers { 0;    }
+    ha:attributes {
+     init-invis=0
+    }
+    purpose = fab
+   }
+   ha:4 {
+    name = top-doc
+    ha:type { top=1; doc=1;    }
+    li:layers { 1;    }
+    ha:attributes {
+     init-invis=0
+    }
+    purpose = fab
+   }
+    ha:5 {
+     name = top-doc
+     ha:type { top=1; doc=1;     }
+     li:layers { 2;     }
+     ha:attributes {
+      init-invis=0
+     }
+     purpose = fab
+    }
+    ha:6 {
+     name = top-doc
+     ha:type { top=1; doc=1;     }
+     li:layers { 3;     }
+     ha:attributes {
+      init-invis=0
+     }
+     purpose = fab
+    }
+  }
+ }
+ li:pcb-rnd-conf-v1 {
+  ha:overwrite {
+   ha:design {
+    text_font_id = 0
+     text_scale = 100
+     via_thickness = 275.60 mil
+     via_drilling_hole = 47.24 mil
+     text_thickness = 0
+     line_thickness = 250.00 um
+     clearance = 25.00 mil
+   }
+   ha:editor {
+    grid_unit = mm
+    grids_idx = 10
+    grid = 250.00 um
+     buffer_number = 0
+      all_direction_lines = true
+       rubber_band_keep_midlinedir = true
+       rubber_band_mode = true
+   }
+  }
+ }
+ ha:pixmaps {
+ }
+}
Index: TRBS/uturn.png
===================================================================
Cannot display: file marked as a binary type.
svn:mime-type = application/octet-stream
Index: TRBS/uturn.png
===================================================================
--- TRBS/uturn.png	(nonexistent)
+++ TRBS/uturn.png	(revision 542)

Property changes on: TRBS/uturn.png
___________________________________________________________________
Added: svn:mime-type
## -0,0 +1 ##
+application/octet-stream
\ No newline at end of property