how could i know if it run correctly with linux server no graphic

Discuss any questions about BEPUphysics or problems encountered.
parapoohda
Posts: 38
Joined: Fri May 31, 2019 6:30 am

Re: how could i know if it run correctly with linux server no graphic

Post by parapoohda » Sat Aug 03, 2019 3:52 am

Thank you norbo.

parapoohda
Posts: 38
Joined: Fri May 31, 2019 6:30 am

Re: how could i know if it run correctly with linux server no graphic

Post by parapoohda » Fri Aug 09, 2019 11:40 am

My client and server are unsync. It walk with difference velocity. My client is faster. Client use Unity. And Sever is use updateCharacterGoal.
I send bepu target and speed back to client. And then make character move.
But in bepu I make it send position back as foot print.

Here are my thread code

Code: Select all

void PoolThread()
        {
            var deltaTime = 0.015f;
            var sleepTime = (int)(deltaTime * 1000);
            while (true)
            {
                simulation.Timestep(deltaTime, threadDispatcher);
                foreach (var pair in walkCharacters)
                {
                    var character = pair.Value;
                    if (character.CalculateMagnitude() > 0.5)
                    {
                        var distant = character.CalculateDistant();
                        if (distant > 0.2)
                        {

                            if (!character.IsCalculateVelocityYet)
                            {
                                character.CalculateVelocity();
                            }
                            //charac.MunipulateVelocity();
                            character.CharacterInputt.UpdateCharacterGoals(character.Velocity, character.MoveSpeed, [color=#FF4000]sleepTime[/color]);
                            character.InstantMove();
                        }
                        else
                        {
                            walkRemoveCharacters.Add(character.collider.bodyHandle);
                        }
                    }
                }
                foreach (var handle in walkRemoveCharacters)
                {
                    if (walkCharacters.ContainsKey(handle))
                    {
                        walkCharacters.Remove(handle);
                        //simulation.Bodies.Remove(handle);
                        //handleUnits.Remove(handle);
                    }
                }
                walkRemoveCharacters.Clear();
                if (isStop)
                {
                    break;
                }
                Thread.Sleep(sleepTime);
            }
        }
First i use sleep time but it seem slow at UpdateCharacterGoals. After that I try deltatime but it is slower.
So I try this

Code: Select all

void PoolThread()
        {
            while (true)
            {
                foreach (var pair in walkCharacters)
                {
                    var character = pair.Value;
                    if (character.CalculateMagnitude() > 0.5)
                    {
                        var distant = character.CalculateDistant();
                        if (distant > 0.2)
                        {

                            if (!character.IsCalculateVelocityYet)
                            {
                                character.CalculateVelocity();
                            }
                            character.CharacterInputt.UpdateCharacterGoals(character.Velocity, character.MoveSpeed, deltaTime);
                            character.InstantMove();
                        }
                        else
                        {
                            walkRemoveCharacters.Add(character.collider.bodyHandle);
                        }
                    }
                }

                foreach (var handle in walkRemoveCharacters)
                {
                    if (walkCharacters.ContainsKey(handle))
                    {
                        walkCharacters.Remove(handle);
                        //handleUnits.Remove(handle);
                    }
                }
                walkRemoveCharacters.Clear();
                if (isStop)
                {
                    break;
                }
                Simulation.Timestep(deltaTime, threadDispatcher);
            }
        }
Program seem do nothing. I think because of it is rapid fire.

I have another question what is thread dispatcher?

Norbo
Site Admin
Posts: 4708
Joined: Tue Jul 04, 2006 4:45 am

Re: how could i know if it run correctly with linux server no graphic

Post by Norbo » Fri Aug 09, 2019 10:35 pm

Thread.Sleep will sleep at least as long as the input value, but is not guaranteed any level of precision beyond that. The resolution depends upon the operating system. On windows, I believe the default resolution is 15.625ms, so you're dealing with very coarse timing. It's possible to force higher resolution, and it's possible to use Thread.Sleep(1) if you know you need to sleep a duration longer than the sleep resolution to help skip some time, but for significant precision you generally need a busy loop. (To make it a little friendlier, you can use Thread.Yield and Thread.Sleep(0) to schedule different sets of waiting threads.)

On top of that, it's not enough to simply wait a fixed delta time between updates, since the update itself could take time. To know how much longer you need to wait, you have to measure how long it's actually been since the start of the last update. Stopwatch.GetTimestamp/Stopwatch.Frequency can give you reasonably precise measurements.
I have another question what is thread dispatcher?
It's the interface that bepuphysics uses to launch threads for multithreading internally. It should launch a number of threads equal to the number of workers you want to use- the engine handles job scheduling internally.

If you don't want to use multithreading internally, you can just not pass a thread dispatcher into the simulation.Timestep function.

parapoohda
Posts: 38
Joined: Fri May 31, 2019 6:30 am

Re: how could i know if it run correctly with linux server no graphic

Post by parapoohda » Sat Aug 10, 2019 4:18 am

Thank you.
On top of that, it's not enough to simply wait a fixed delta time between updates, since the update itself could take time. To know how much longer you need to wait, you have to measure how long it's actually been since the start of the last update. Stopwatch.GetTimestamp/Stopwatch.Frequency can give you reasonably precise measurements.
You mean i can find fixed time by Stopwatch.GetTimestamp/Stopwatch.Frequency. Is this will get me delta time right?
Or you mean I have to use that every thread frame.(Use it inside thread)

After I make more dt the faster it walk after 6 it walk faster than unity

Code: Select all

 simulation.Timestep(deltaTime, threadDispatcher);
Is this code tell bepu deltatime?
What I have to put in this deltatime?


What is delta time I have to put in update character goals

Norbo
Site Admin
Posts: 4708
Joined: Tue Jul 04, 2006 4:45 am

Re: how could i know if it run correctly with linux server no graphic

Post by Norbo » Sat Aug 10, 2019 6:25 pm

Or you mean I have to use that every thread frame.(Use it inside thread)
Yes, in order to wait the correct amount of time, you must constantly be measuring how much longer you have to wait:
measuredwaiting.png
measuredwaiting.png (7.99 KiB) Viewed 34 times
Is this code tell bepu deltatime?
What I have to put in this deltatime?
The simulation itself should operate on a fixed timestep- choose a constant value ahead of time. After that much time has elapsed (as measured in the waiting loop) since the start of the previous update, you trigger another timestep with that constant timestep duration.

UpdateCharacterGoals needs the same fixed timestep duration.

parapoohda
Posts: 38
Joined: Fri May 31, 2019 6:30 am

Re: how could i know if it run correctly with linux server no graphic

Post by parapoohda » Sun Aug 11, 2019 7:08 am

Thank you.

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