Hi !
Featured games (85)
games approved by the League of Dukes
Games in Showcase (636)
Games in Android Showcase (178)
games submitted by our members
Games in WIP (687)
games currently in development
News: Read the Java Gaming Resources, or peek at the official Java tutorials
    Home     Help   Search   Login   Register   
Pages: [1]
  ignore  |  Print  
  simple question about the Timer  (Read 1315 times)
0 Members and 1 Guest are viewing this topic.
Offline Kommi

Junior Devvie

All opinions will be lined up and shot!

« Posted 2002-12-18 17:53:10 »

I know that this hi res Timer thing has been discussed to death, but please bear with me, I am new to this. The following is just simple code to display the value of the Java3DTimer:

import com.sun.j3d.utils.timer.J3DTimer;
class test
     public static void main(String[] args)
           long time;
           time = J3DTimer.getValue();

When I run the code here is the oputput:

My question is what exactly does this number mean? And how can I use this timer to have an accurate frame rate. I have a simple program with an animation loop and the statement  thread.sleep(30)  which is 30ns. Ofcourse this is inaccurate. I was wondering how exactly do I implement the Java3DTimer in my animation loop?

Also what is WakeupOnElapsedTime(30) about? and how is it used?
Any help is greatly appreciated.

Offline Herkules

Senior Devvie

Friendly fire isn't friendly!

« Reply #1 - Posted 2002-12-18 18:36:36 »

The number means absolutely nothing. You can just use it to calculate differences of these which gives you quite accurately the time between two calls of J3DTimer.getValue(), measured in nanoseconds.

Thread.sleep(30) sleeps for 30 milliseconds, not nanoseconds. So executing J3DTimer.getValue() before and after the sleep should yield a difference of 30*1000000, rounds about.

WakeupOnElapsedTime(30) is related to Thread.sleep(30) somehow, just synchronized with Java3D.
WakeupOnElapsedTime(30) is a good mean to drive a gameloop with ~30FPS. Triggered by WakeupOnElapsedTime(), we measure times exactly with J3DTimer.getValue() then.

HARDCODE    --     DRTS/FlyingGuns/JPilot/JXInput  --    skype me: joerg.plewe
Offline Kommi

Junior Devvie

All opinions will be lined up and shot!

« Reply #2 - Posted 2002-12-18 19:48:15 »

I dont understan exactly. So instead of thread.sleep(30) I should use WakeupOnElapsedTime(30)? where does the java3DTimer go?

while (true)

  try { thread.sleep(30)
catch ...
Here is a simple animation loop (pseudo code) that I am using. Where can I implement WakeupOnElapsedTime(30) or java3DTimer in order to have a better refresh rate? Also wich packages do I need to import for WakeupOnElapsedTime(30)?

Pages: [1]
  ignore  |  Print  
You cannot reply to this message, because it is very, very old.

Dwinin (71 views)
2015-11-07 13:29:08

Rems19 (81 views)
2015-10-31 01:36:56

Rems19 (74 views)
2015-10-31 01:32:37

williamwoles (106 views)
2015-10-23 10:42:59

williamwoles (92 views)
2015-10-23 10:42:45

Jervac_ (106 views)
2015-10-18 23:29:12

DarkCart (134 views)
2015-10-16 00:58:11

KaiHH (116 views)
2015-10-11 14:10:14

KaiHH (156 views)
2015-10-11 13:26:18

BurntPizza (171 views)
2015-10-08 03:11:46
Rendering resources
by Roquen
2015-11-13 14:37:59

Rendering resources
by Roquen
2015-11-13 14:36:58

Math: Resources
by Roquen
2015-10-22 07:46:10

Networking Resources
by Roquen
2015-10-16 07:12:30

Rendering resources
by Roquen
2015-10-15 07:40:48

Math: Inequality properties
by Roquen
2015-10-01 13:30:46

Math: Inequality properties
by Roquen
2015-09-30 16:06:05

HotSpot Options
by Roquen
2015-08-29 11:33:11 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‑
Powered by MySQL Powered by PHP Powered by SMF 1.1.18 | SMF © 2013, Simple Machines | Managed by Enhanced Four Valid XHTML 1.0! Valid CSS!