worked on 3d models within map

adjusted grid factory
adjusted nav mesh factory
minoor changes/fixes
new helper classes
refactoring

geo/Triangle3.h

@@ -86,6 +86,48 @@ public:
 
 	}
 
+	/** add some slight delta to prevent rounding issues */
+	bool intersectsDelta(const Ray3& ray, const double delta, Point3& pos) const {
+
+		const Point3 e1 = p2-p1;
+		const Point3 e2 = p3-p1;
+
+		// make delta an absolute value (independent of the triangle's size)
+		// larger triangle -> smaller delta, as u,v are [0:1]
+		//double deltaU = delta/e2.length();
+		//double deltaV = delta/e1.length();
+
+		const double deltaU = delta;
+		const double deltaV = delta;
+
+		const Point3 h = cross(ray.dir, e2);
+		const double a = dot(e1, h);
+
+		if (a > -0.00001 && a < 0.00001) {return false;}
+
+		const double f = 1/a;
+
+		const Point3 s = ray.start - p1;
+		const double u = f * dot(s,h);
+
+		if (u < 0.0-deltaU || u > 1.0+deltaU) {return false;}
+
+		const Point3 q = cross(s, e1);
+		const double v = f * dot(ray.dir, q);
+
+		if (v < 0.0-deltaV || u + v > 1.0+deltaV) {return false;}
+		const double t = f * dot(e2,q);
+
+
+		if (t > 0.00001) {
+			pos = ray.start + (ray.dir * t);
+			return true;
+		}
+
+		return true;
+
+	}
+
 /*
 	int rayIntersectsTriangle(float *p, float *d,
 				float *v0, float *v1, float *v2) {