Increase epsilon constant

src/math/ExtendedTriangle.js

@@ -2,7 +2,7 @@ import { Triangle, Vector3, Line3, Sphere, Plane } from 'three';
 import { SeparatingAxisBounds } from './SeparatingAxisBounds.js';
 import { closestPointsSegmentToSegment, sphereIntersectTriangle } from './MathUtilities.js';
 
-const ZERO_EPSILON = 1e-15;
+const ZERO_EPSILON = 1e-14;
 function isNearZero( value ) {
 
 	return Math.abs( value ) < ZERO_EPSILON;
@@ -192,6 +192,13 @@ ExtendedTriangle.prototype.intersectsTriangle = ( function () {
 
 					}
 
+					count ++;
+					if ( count === 2 && startPointIntersection === - 1 ) {
+
+						break;
+
+					}
+
 				} else if ( count >= 2 ) {
 
 					// if we're here that means that there must have been one point that had
@@ -203,13 +210,6 @@ ExtendedTriangle.prototype.intersectsTriangle = ( function () {
 
 				}
 
-				count ++;
-				if ( count === 2 && startPointIntersection === - 1 ) {
-
-					break;
-
-				}
-
 			}
 
 		}

test/Math.TriangleIntersections.test.js

@@ -159,6 +159,34 @@
 
 	} );
 
+	it( 'triangles should return a correct intersection (issue #655)', () => {
+
+		t1.a.set( 32.22699737548828, 1.2630000114440918, - 11.8149995803833 );
+		t1.b.set( 31.316997528076172, 1.2630000114440918, - 11.739999771118164 );
+		t1.c.set( 32.22699737548828, 1.2630000114440918, - 11.739999771118164 );
+		t1.needsUpdate = true;
+
+		t2.a.set( 31.316997528076172, 1.933000087738037, - 7.585000038146973 );
+		t2.b.set( 31.316997528076172, - 0.8669999837875366, - 7.295000076293945 );
+		t2.c.set( 31.316997528076172, - 0.8669999837875366, - 7.585000038146973 );
+		t2.needsUpdate = true;
+
+		expect( t1.intersectsTriangle( t2 ) ).toBe( false );
+
+		t2.a.set( 32.22699737548828, 1.2630000114440918, - 11.8149995803833 );
+		t2.b.set( 31.316997528076172, 1.2630000114440918, - 11.739999771118164 );
+		t2.c.set( 32.22699737548828, 1.2630000114440918, - 11.739999771118164 );
+		t2.needsUpdate = true;
+
+		t1.a.set( 31.316997528076172, 1.933000087738037, - 7.585000038146973 );
+		t1.b.set( 31.316997528076172, - 0.8669999837875366, - 7.295000076293945 );
+		t1.c.set( 31.316997528076172, - 0.8669999837875366, - 7.585000038146973 );
+		t1.needsUpdate = true;
+
+		expect( t1.intersectsTriangle( t2 ) ).toBe( false );
+
+	} );
+
 } );
 
 describe( 'Triangle Intersection line', () => {
@@ -296,7 +324,7 @@
 
 	// this test fails due to floating point precision issues. If the triangles are scaled up
 	// it reports an intersection as expected.
 	it.skip( 'triangles almost coplanar should intersect on point', () => {
 
 		t1.a.set( 0.0720, 0.2096, 0.3220 );
 		t1.b.set( 0.0751, 0.2148, 0.3234 );