X-Git-Url: http://git.scottworley.com/nt3d/blobdiff_plain/2f26ede4efa95cc756a2b3240c2a9e29f0f48486..4a6f6f14490c1c6f51843229d2d521368aa25c7f:/nt3d.js

diff --git a/nt3d.js b/nt3d.js
index c69c185..239b03c 100644
--- a/nt3d.js
+++ b/nt3d.js
@@ -83,6 +83,14 @@ nt3d = {
 			return nt3d.sub(path[i+1], path[i-1]);
 		};
 	},
+	pathnormals_from_point: function(path, p) {
+		// Use this with any point that is not on any path tangent line
+		var pathnormals = [];
+		for (var i = 0; i < path.length; i++) {
+			pathnormals.push(this.sub(path[i], p));
+		}
+		return pathnormals;
+	},
 	to_function: function(thing, make_indexer) {
 		// If thing is a point, just yield thing every time.
 		// If thing is a list of points && make_indexer, index into thing.
@@ -211,7 +219,7 @@ nt3d = {
 	},
 	project: function(a, b) { // Project b onto a
 		var a_magnitude = this.magnitude(a);
-		return this.scale(a, this.dot(a, b) / a_magnitude * a_magnitude);
+		return this.scale(a, this.dot(a, b) / (a_magnitude * a_magnitude));
 	},
 	project_to_orthogonal: function(a, b) {
 		// The nearest thing to b that is orthogonal to a
@@ -220,12 +228,15 @@ nt3d = {
 	translate: function(points, offset) {
 		var translated = [];
 		for (var i = 0; i < points.length; i++) {
-			translated[i] = [points[i][0] + offset[0],
-			                 points[i][1] + offset[1],
-			                 points[i][2] + offset[2]];
+			translated[i] = this.translate_point(points[i], offset);
 		}
 		return translated;
 	},
+	translate_point: function(point, offset) {
+		return [point[0] + offset[0],
+		        point[1] + offset[1],
+		        point[2] + offset[2]];
+	},
 	angle_between: function(a, b) { // a and b must be unit vectors
 		return Math.acos(this.dot(a, b));
 	},