C# To take 1 datum / 20

Question

1.89/5 (2 votes)

See more:

Hello !

The text file which is created in this code, is not good. I don't have the good values.

I suppose my problem is about this line :

C#

float delta_x = (((nv_data [59].positions [frame] - nv_data [59].positions [frame - 1]).z) * 0.001f);

I think it takes :

nv_data[59].positions[20]-nv_data[59].positions[19]
nv_data[59].positions[40]-nv_data[59].positions[39]
nv_data[59].positions[60]-nv_data[59].positions[59]
...

or :

nv_data[59].positions[20]-nv_data[59].positions[0]
nv_data[59].positions[21]-nv_data[59].positions[1]
nv_data[59].positions[22]-nv_data[59].positions[2]
...

or :

nv_data[59].positions[20]-nv_data[59].positions[19]
nv_data[59].positions[21]-nv_data[59].positions[20]
nv_data[59].positions[22]-nv_data[59].positions[21]
...

Instead of : (and it's it that I want)

nv_data[59].positions[20]-nv_data[59].positions[0]
nv_data[59].positions[40]-nv_data[59].positions[20]
nv_data[59].positions[60]-nv_data[59].positions[40]
...

I want to use only each frame / 20 .

Here the part of the code where it appears :

C#

void FixedUpdate() {

    delta_time += Time.deltaTime;

    if (frame < nv_data [0].positions.Length) {

                    if ((frame % 20) == 0) {

                            for (int k = 0; k < body.Length; ++k) {

                            if (body [k] != null) { 

                                            body [k].transform.localPosition = nv_data [k].positions [frame] / 1000; // This part is ok

                                    } else
                                            continue;
                            }

            Debug.Log("Frame_animation : " + frame); // I have 1 frame / 20 : 0 , 20 , 40 , 60 , ...

                            if (indice_3 < forces_dup.Length-1) {

                                if (frame >= 20) {

                    Debug.Log ("Frame_writer : " + frame); // I have 1 frame / 20 : 0 , 20 , 40 , 60 , ...
                                            float delta_x = (((nv_data [59].positions [frame] - nv_data [59].positions [frame - 1]).z) * 0.001f); // It's here that I think I have some problems
                                            vitesse = delta_x / Time.deltaTime;
                                            acceleration = (vitesse - ancienne_vitesse) / Time.deltaTime;
                                            ancienne_vitesse = vitesse;

                                            indice_3 ++;

                                            StreamWriter writer = new StreamWriter ("Masse-fois-Accelerations_FR_5Hz", true);

                                            using (writer) {

                                                    writer.WriteLine (Time.time + "\t" + 80*acceleration + "\t" + forces_dup [indice_3].x); // Here I don't have the correct values for 80*acceleration
                                            }
                                    }
                            }
                    }

                            frame++;
            }
    }

Thank you very much in advance for your help

Posted 4-May-15 2:55am

Coralie B

Updated 4-May-15 9:51am

Maciej Los

v5

Add a Solution

Comments

Florian Braun 4-May-15 9:16am

a very short guess: change "frame-1" to "frame-20"?? (in your marked line)

Coralie B 4-May-15 9:22am

I tried but it doesn't run...
I had wrong result again

Coralie B 5-May-15 2:21am

So it's correct this solution.
But at the end I had never the good result in my text file. Therefore, I supposed that the problem came from the line : float delta_x = (((nv_data [59].positions [frame] - nv_data [59].positions [frame - 1]).z) * 0.001f);
even though I put frame-20 instead of frame-1 .

In short, you gave me the good solution for this line. Thank you !

Florian Braun 4-May-15 9:27am

did you try to set a breakpoint to that line to check whats inside all these variables?

Coralie B 4-May-15 9:38am

No I didn't know how can I use breakpoint.
Actually I know to use it but I don't know how I can analyse the result.

I think it's not useful to tell you what exact values I much have because they are float, so there are a lot numbers. I know that I have not the correct values because I did this code in a different script. And I compared the both, and there was no connection.

Florian Braun 4-May-15 9:46am

if you program stops because of hitting the breakpoint you can hover your mouse pointer over the variables you want to view. or you add so called watchers.
another way would be more logging. maybe the values for nv_data[59].positions[frame] and nv_data[59].positions[frame-20] and calculate delta_x yourself... but without seeing your values and the results it's not possible to help.

Also: whats that member "z" of your positions?

Florian Braun 4-May-15 9:29am

maybe it would help us if you tell more about your expected values and the values you are getting...

Coralie B 4-May-15 10:03am

Actually I have the good code. I just tested.
But I don't have the correct values at the end... when I compare to the older code...

But thank you !

Maciej Los 4-May-15 16:15pm

Good code - incorrect values. Very nteresting...

Coralie B 5-May-15 2:17am

Actually the problem wasn't about the line that I indicated. So I told you that this line is correct :

float delta_x = (((nv_data [59].positions [frame] - nv_data [59].positions [frame - 1]).z) * 0.001f);

I had tested it with Debug.Log etc ... And I had the good result at this location.

But in the following. It was about the Time.deltaTime . Because before this code, my old code runs with a different frequency. In short I found the solution.

1 solution

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Coralie B · Accepted Answer · 2015-05-04T20:22:00

C#

void FixedUpdate() {

    delta_time += Time.deltaTime;

    if (frame < nv_data [0].positions.Length) {

                    if ((frame % 20) == 0) {

                            for (int k = 0; k < body.Length; ++k) {

                            if (body [k] != null) { 

                                            body [k].transform.localPosition = nv_data [k].positions [frame] / 1000;

                                    } else
                                            continue;
                            }

                            if (indice_3 < forces_dup.Length-1) {

                                if (frame >= 1) {

                                            float delta_z = (((nv_data [59].positions [frame] - nv_data [59].positions [frame - 20]).z) * 0.001f);
                                            vitesse = delta_z / (Time.deltaTime*20);
                                            acceleration = (vitesse - ancienne_vitesse) / (Time.deltaTime*20);
                                            ancienne_vitesse = vitesse;

                                            indice_3 ++;

                                            StreamWriter writer = new StreamWriter ("Masse-fois-Accelerations_FR_5Hz", true);

                                            using (writer) {

                                                    writer.WriteLine (Time.time + "\t" + 80*acceleration + "\t" + forces_dup [indice_3].x);
                                            }
                                    }
                            }
                    }

                            frame++;
            }