Making the polygon loading more robust by detectiing invalid normals and

rejecting those points

Author: madhephaestus

.gitignore

@@ -26,3 +26,4 @@ html
 /handmade.step
 /test-export-2.step
 /test-export.step
+/Part-Num-0.svg.png

src/main/java/eu/mihosoft/vrl/v3d/Edge.java

@@ -125,7 +125,7 @@ public static Polygon toPolygon(List<Vector3d> points, Plane plane) {
         Polygon p = Polygon.fromPoints(points);
 
         p.vertices.stream().forEachOrdered((vertex) -> {
-            vertex.normal = plane.normal.clone();
+            vertex.normal = plane.getNormal().clone();
         });
 
 //        // we try to detect wrong orientation by comparing normals
@@ -897,8 +897,8 @@ private static List<List<Polygon>> searchPlaneGroups(List<Polygon> polygons) {
                     continue;
                 }
 
-                Vector3d nOuter = pOuter.plane.normal;
-                Vector3d nInner = pInner.plane.normal;
+                Vector3d nOuter = pOuter.plane.getNormal();
+                Vector3d nInner = pInner.plane.getNormal();
 
                 double angle = nOuter.angle(nInner);
 

src/main/java/eu/mihosoft/vrl/v3d/Extrude.java

@@ -98,11 +98,18 @@ private CSG monotoneExtrude(Vector3d dir, Polygon polygon1) {
 				Vector3d topV1 = polygon2.vertices.get(i).pos;
 				Vector3d bottomV2 = polygon1.vertices.get(nexti).pos;
 				Vector3d topV2 = polygon2.vertices.get(nexti).pos;
-
+				double distance = bottomV1.minus(bottomV2).magnitude();
+				if(Math.abs(distance)<Plane.EPSILON*10) {
+					//System.out.println("Skipping invalid polygon");
+					continue;
+				}
 				List<Vector3d> pPoints = Arrays.asList(bottomV2, topV2, topV1, bottomV1);
-
-				newPolygons.add(Polygon.fromPoints(pPoints, polygon1.getStorage()));
-
+				try {
+					newPolygons.add(Polygon.fromPoints(pPoints, polygon1.getStorage()));
+				}catch(Exception ex) {
+					System.out.println("Polygon has problems: ");
+					ex.printStackTrace();
+				}
 			}
 
 			polygon2 = polygon2.flipped();