Java-Gaming.org Hi !
 Featured games (84) games approved by the League of Dukes Games in Showcase (565) Games in Android Showcase (152) games submitted by our members Games in WIP (607) 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 4001 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

You cannot reply to this message, because it is very, very old.

 Riven (10 views) 2015-04-01 18:27:05 ags1 (27 views) 2015-03-31 10:55:12 theagentd (13 views) 2015-03-27 23:08:20 wxwsk8er (54 views) 2015-03-20 15:39:46 Fairy Tailz (48 views) 2015-03-15 21:52:20 Olo (29 views) 2015-03-13 17:51:59 Olo (33 views) 2015-03-13 17:50:51 Olo (40 views) 2015-03-13 17:50:16 Olo (44 views) 2015-03-13 17:47:07 ClaasJG (61 views) 2015-03-10 11:36:42
 BurntPizza 21x LiquidNitrogen 21x KevinWorkman 18x EgonOlsen 17x theagentd 16x basil_ 16x Roquen 15x Varkas 12x wessles 11x 65K 11x Riven 9x Rayvolution 9x phu004 8x SHC 8x princec 8x Ashedragon 8x
 How to: JGO Wikiby Mac702015-02-17 20:56:162D Dynamic Lighting2015-01-01 20:25:42How do I start Java Game Development?by gouessej2014-12-27 19:41:21Resources for WIP gamesby kpars2014-12-18 10:26:14Understanding relations between setOrigin, setScale and setPosition in libGdx2014-10-09 22:35:00Definite guide to supporting multiple device resolutions on Android (2014)2014-10-02 22:36:02List of Learning Resources2014-08-16 10:40:00List of Learning Resources2014-08-05 19:33:27
 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