I want to build a Virtual World in Unreal Engine,  with the purpose of educating Fluid Dynamics.  Still a lot of work has to be done.

First video on the project

Update June 2018
Followed several online courses on using blueprints in Unreal Engine.
See https://unreal.fluiddynamics.eu/main-water-system-in-unreal/

First video will follow soon?

Update October 2017. After a long time following courses on how to build in Unreal Engine, I finally have started with building blueprints. Busy building a watersystem

Update may 2017. I have reactivated the project. Was too busy with ordinary work :-). I am following a course on Udemy (Unreal Engine 4: How to Develop Your First Two Games) to get my skills on a higher level.

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Water material

I looked into different tutorials. In this page step for step my water material.



Tiling will be adjusted so that the “basic” block is 1 * 1 m. Each Branch in the FD_watersystem will have its own instance of the watermaterial. In BP I can set the parameters for each branch.

  • S Scalervector
  • Append x and y

Future optimisations

  • Small wave/ ripples by wind. So direction is based on wind.
  • Swimmable water?
  • Particles
  • vertex painting
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To get a multiplayer working properly replication is important. Until now I have no knowledge on replication?

Aim is to use blueprints


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Server site form amazon. The nice thing is that you pay per hour.



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Python in Unreal

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Niagara Particle system

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Editor Utility Widgets

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Test met trello


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Tutorial Hourences

I have bought the level tutorial from hourences.
In this post the notes (things I want to remember) when watching the tutorials.

Video chapter 1, basics

  • Navigate in editor by using left mouse, right mouse and both. With this methode, use high camera speed
  • Alt and mouse  for staying looking at object.
  • Ctrl + right mouse : move object y-axis (green)
  • Ctrl + left mouse : move object x -axis (red)
  • Ctrl + both mouse : move object z axis (blue)
  • Ctrl + Shift ……  Camera will follow the object
  • Spacebar : rotation mode
  • 2 x Spacebar : scale mode
  • copying:  Ctrl C / V, Ctrl + W,  Alt

Video 2 building

  • With BSP textures, select all faces and choose align in the proprieties box.
  • Mesh, duplicate mesh, place on the proper location and replace by proper mesh.
  • Size of objects 5 10 …same as the grid
  • Ctrl Shift G is temporary ungroup to take out one part. Finish with Ctrl Shift G again.

Video 3 landscape

  • With landscape : change lod in details to increase performance.
  • Afterwards you can add landscape
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How to get my project on Github

Disclaimer:  I am new to Unreal Engine and just trying to get things working. So there is no guaranty it will work with your project. Maybe there are much better solutions. Don’t blame me if terrible things happen to your project. Always make backups.

In the future hopefully more persons are going to work on the Unreal Fluid Dynamics project. So I decided to put my project on github. Yes, just as the Unreal Engine :-).
I made an account and installed Github Desktop.
Then things got messy, when uploading the project I got an error message by Github Desktop.  I had no idea what was wrong. Also there was not a lot of info in the error message. So I started searching the internet and started to use the git-shell. This was the error message in git.
Based on my internet search, probably 2 things good be wrong:
1. Github has a maximum file-size of 100 Mb.
2. Maximum size project on Github is around 1 Gb.
My project has files > 100 Mb en the total size of the map is 4.8 Gb.
So I was naive to think this could be working.

Still I want to try to get the project on Github.
The maximum size can be solved with  Git Large File Storage
After some research (just deleting directories and files from the project map and check if I could run the project in UE editor) it looks like:
– There are  directories (for example saved and build) which can be deleted without a problem.
– There are directories (for example Content/Startercontent)  which are big and added when the project is created in UE editor. So it is not necessary to put them in a repository.
Looks like almost all data is stored in the .umap file (which is large).

Very useful website on git commands.

So I took the following steps.

  1. Make account at github.
    Note: Don’t make a repository yet
  2. Install github desktop.
    Enter your github info. Set the clone path to the directory with you project.
    Note: Don’t make a repository yet
  3. Start Git shell, go to your project directory
    type “git init”
  4. For excluding maps you need to create the .gitignore file
    type “touch .gitignore”
    You can open the .gitignore file in a text editor. Mine has the following content:
    # ignore files
    More info on this file
  5. Activating the git large file pluging
    In git shell type “git lfs install”
    type “git lfs track “*.umap”
    It is the levelfiles (.umap) which get big.
  6. Make the repository in github desktop
    Start github desktop
    Add repository
    Your files will appear, check if you see files which should not be in the repository. Maybe you need to adjust the .gitignore file
  7. Create and upload first version to github.com
    Enter text add summary, for example “first upload”
    Hit the “commit to master” button
    Select history (top of screen)
    Your project is ready to get uploaded.
    Hit the publish.
    Have patience, there is something happening / uploading.
    Check github.com if your files are really there.

Some thoughts/remarks
At this moment there is not a lot of content in my project, only a large terrain.
It looks like almost all data is stored in the umap file. Because I am going to make changes to the project I will discover the effect of those changes on the files (by using github desktop)


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