Java-Gaming.org Hi !
 Featured games (90) games approved by the League of Dukes Games in Showcase (769) Games in Android Showcase (230) games submitted by our members Games in WIP (855) games currently in development
 News: Read the Java Gaming Resources, or peek at the official Java tutorials
Pages: [1]
 ignore  |  Print
 Drawing a PQ Torus  (Read 5362 times) 0 Members and 1 Guest are viewing this topic.
EricTheRed

Senior Newbie

Beware the killer bunny, destoryer of worlds!

 « Posted 2003-10-27 22:25:06 »

[Why is it that the most apparently simple tasks ultimately turn out to be the most difficult? Bah.]

So, I decided to create a PQ torus knot using LWJGL based on this article. Everything is going well until I attempt to orient my circle using the Frenet Frame I've created. (Erm, this will most likely make more sense if you skim the article, sorry). I'm certain that the Frenet Frame is NOT at fault, because everything looks alright. I assume that there's a problem with my orientation code, which looks like this:
 1  2  3  4  5  6 `foreach point_on_circle    x = cos(theta) + toruspoint.x    y = sin(theta) + toruspoint.y     Vector point = [x * N.x, x * N.y, x * N.z] + [y * B.x, y * B.y, y * B.z]end for`

(Where N and B are the two vectors of the Frenet Frame). The article says "newPoint = point.x * N + point.y * B" and as far as I can tell my code does that, but surprise, surprise, what I get looks nothing like it should. I have no idea where to go from here.

I've avoided actually posting the entire code up, because frankly its ugly and inefficient. However, if you need it to diagnose the problem I'll clean it up a bit and post it.

- Eric
tom
 « Reply #1 - Posted 2003-10-27 22:44:41 »

could it by:

 1  2  3  4  5  6  7  8 `foreach point_on_circle    x = cos(theta)    y = sin(theta)    Vector point    point.x = (x*N.x+y*B.x) + toruspoint.x    point.y = (x*N.y+y*B.y) + toruspoint.y    point.z = (x*N.z+y*B.z) + toruspoint.zend for`

Thats if toruspoint represent the red dots in the image.

EricTheRed

Senior Newbie

Beware the killer bunny, destoryer of worlds!

 « Reply #2 - Posted 2003-10-27 22:57:18 »

Excellent. It works perfectly now! How amazingly frustrating that it turned out to be such a simple solution. And, y'know, I had something almost like that until I chucked it out 'cause I thought I was going in the wrong direction. Well, that'll teach me I guess. Thank you so much for your prompt reply.
Pages: [1]
 ignore  |  Print

 EgonOlsen (1597 views) 2018-06-10 19:43:48 EgonOlsen (1698 views) 2018-06-10 19:43:44 EgonOlsen (1152 views) 2018-06-10 19:43:20 DesertCoockie (1580 views) 2018-05-13 18:23:11 nelsongames (1180 views) 2018-04-24 18:15:36 nelsongames (1703 views) 2018-04-24 18:14:32 ivj94 (2470 views) 2018-03-24 14:47:39 ivj94 (1685 views) 2018-03-24 14:46:31 ivj94 (2769 views) 2018-03-24 14:43:53 Solater (907 views) 2018-03-17 05:04:08
 Deployment and Packagingby mudlee2018-08-22 18:09:50Java Gaming Resourcesby gouessej2018-08-22 08:19:41Deployment and Packagingby gouessej2018-08-22 08:04:08Deployment and Packagingby gouessej2018-08-22 08:03:45Deployment and Packagingby philfrei2018-08-20 02:33:38Deployment and Packagingby philfrei2018-08-20 02:29:55Deployment and Packagingby philfrei2018-08-19 23:56:20Deployment and Packagingby philfrei2018-08-19 23:54:46
 java-gaming.org is not responsible for the content posted by its members, including references to external websites, and other references that may or may not have a relation with our primarily gaming and game production oriented community. inquiries and complaints can be sent via email to the info‑account of the company managing the website of java‑gaming.org