git.scottworley.com Git - nt3d/blob

1 <html>

2 <head>

3 <title>Serrated</title>

4 <script type="text/javascript" src="nt3d.js"></script>

5 <script type="text/javascript">

6 function serrated(params) {

7 var tau = 2 * Math.PI;

8 var path_length = params.num_serrations * params.steps_per_serration;

9 var path = [];

10 for (var i = 0; i <= path_length; i++) {

11 path[i] = [params.length*i/path_length,0,0];

12 }

13 var serration_length = params.length / params.num_serrations;

14 var serration_half_length = serration_length / 2;

15 var serration_radius = serration_half_length / Math.sin(tau * params.arc / 2);

16 var serration_max_height = Math.sqrt(serration_radius*serration_radius - serration_half_length*serration_half_length);

17 // This emits a Sabre Grind. TODO: Support a double bevel.

18 // http://en.wikipedia.org/wiki/Grind#Typical_grinds

19 // http://www.allaboutpocketknives.com/images/aapk_content/blade_bevel.JPG

20 var edge_height = params.thickness / (2 * Math.tan(tau * params.edge_bevel_angle));

21 function shape(i) {

22 var serration_progress = (i % params.steps_per_serration) / params.steps_per_serration;

23 var serration_x = serration_progress * serration_length - serration_half_length;

24 var serration_height = serration_max_height - Math.sqrt(serration_radius*serration_radius - serration_x*serration_x);

25 if (params.arc < 0) serration_height *= -1;

26 var blade_height = params.depth + serration_height;

27 return [[0, 0, 0],

28 [blade_height - edge_height, 0, 0],

29 [blade_height, params.thickness/2, 0],

30 [blade_height - edge_height, params.thickness, 0],

31 [0, params.thickness, 0]];

32 }

33 return nt3d.extrude(path, shape, [1,0,0], [0,0,1]);

34 }

35 var params = [["length", 100, ],

36 ["thickness", 2],

37 ["depth", 10],

38 ["num_serrations", 10],

39 ["arc", .2, "Arc of Each Serration (in turns)"],

40 ["steps_per_serration", 11],

41 ["edge_bevel_angle", .05, "Edge Bevel Angle (in turns)"]];

42 </script>

43 </head>

44 <body onload="nt3d.framework(serrated, params)">

45 <h1>Serrated</h1>

46 <p>Make a serrated blade.</p>

47 </body>

48 </html>