Legacy/Swimmable Water Volume Tutorial

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Swimmable Water Volume

This tutorial will go through how to set up a swimmable water volume using a ÔÇ£Physics VolumeÔÇØ in conjunction with a ÔÇ£Post Process VolumeÔÇØ to get the basic look and feel of swimming underwater.

We will also be setting the ÔÇ£BuoyancyÔÇØ of our character in the character blueprint as well as setting up vertical swim input axis actions.

    Follow the link to learn more about the material used in this example: Water_Shader_Tutorial       

Final Outcome

Your end result should resemble the below images.....

Pool Perspective View


Steps to Follow

Initial Set-Up

1. Create a new project using the ÔÇ£ThirdPerson BlueprintÔÇØ template and enable the starter content.

2. In the default level create a new additive ÔÇ£BSPÔÇØ box brush large enough to resemble a pool relative to your characters size.

    a. In my case I created a box roughly 1500 x 1200 x 450
    b. I also rested the pool in a way I could easily walk from the premade stair brushes to the pool deck in order for me to ÔÇ£diveÔÇØ into the pool.

3. Now create a subtractive brush and place it in the center of your pool. This will act as the hole or cut-out area of your pool where the ÔÇ£Physics volumeÔÇØ and ÔÇ£Post Process Volume will rest.

4. In your content browser, search for the word ÔÇ£Shape_Plane,ÔÇØ and place that in your level. Resize this mesh so it fits snuggly in your pool. This plane will represent the waterÔÇÖs surface.

    a. Be sure to turn off the "Shape_Plane" collision.
    b. Double-click the mesh to open the 'Static Mesh Editor' to remove the collision.

5. Now in your content browser type the word ÔÇ£LakeÔÇØ or ÔÇ£OceanÔÇØ in the search field of the ÔÇ£GameÔÇØ folder to find the two example materials of water provided by the starter content.

6. Drag and drop either one of these materials onto your ÔÇ£Shape_PlaneÔÇØ mesh.

7. Click on your water mesh and within the ÔÇ£DetailsÔÇØ tab underneath the ÔÇ£LightingÔÇØ options check the box ÔÇ£Use Two Sided Lighting.ÔÇØ This will make it so when underwater the material is also shown.

    a. Your pool should look something like the first image in the tutorial underneath the ÔÇ£Final OutcomeÔÇØ section. 	
    b. Aside from the translucency of the water material.

Volume Set-Up

Now we will set up the physics volume and the post process volume so that we can apply the look and feel of water to our pool.

8. In the modes section type the words ÔÇ£Physics VolumeÔÇØ in the search field and place this volume in your level. Set the bounds of the volume as close to the ÔÇ£SubtractiveÔÇØ brush as possible.

    a.This volume represents the area in which you will be able to swim around.

9. Within the details panel of your ÔÇ£Physics VolumeÔÇØ under the ÔÇ£Character MovementÔÇØ options there is a few settings we need to change.

    a.Check the box that says ÔÇ£Water VolumeÔÇØ
    b.Change the fluid friction to about 0.35

10. Now we need to pull in a ÔÇ£Post Process VolumeÔÇØ that will give us the underwater look and feel. Set the bounds of this volume similar to your ÔÇ£Physics VolumeÔÇØ

    a.See images on how I set it up in my scene.
    b.The smaller pink box represents the ÔÇ£Post Process VolumeÔÇØ and the outer pink box represents the ÔÇ£Physics Volume.ÔÇØ

Volume Perspective Set-Up

Wireframe Volume Set-Up

Blueprint Set-Up

Now within your character blueprint we need to edit a few things so that our character has a good ÔÇ£BuoyancyÔÇØ and set two different input keys to ascend and descend the volume.

    Currently we are not working with a swimming animation so while ÔÇ£swimmingÔÇØ in the volume we are using the run animation which works fine for the basic goal.

11. Go into your character blueprint labeled ÔÇ£MyCharacterÔÇØ and under the ÔÇ£DefaultsÔÇØ section there is a search field. Type ÔÇ£BuoyancyÔÇØ in the field and set the characters buoyancy to around 1.1

    a. You can play with this setting to make your character more or less buoyant
    b. Too little or too much will make it difficult to have a believable though
Buoyancy setting

12. Now go into your ÔÇ£Project SettingsÔÇØ by clicking on the ÔÇ£EditÔÇØ option.

13. Underneath the ÔÇ£EngineÔÇØ section click on the word ÔÇ£Input.ÔÇØ

    a. Here you will create a new ÔÇ£Axis MappingÔÇØ which controls the vertical movement in the water.
    b. The value of 1.0 = Up and the value of -1.0 = Down.

14. Under the ÔÇ£Axis MappingsÔÇØ drop down box click the plus symbol and label this new Axis Map, ÔÇ£SwimUpÔÇØ

    a. Choose the keyboard key X = 1.0 to swim up
    b. And Z = -1.0 to swim down
Axis Mapping Set-Up

15. Now within our ÔÇ£MyCharacterÔÇØ blueprint of the ÔÇ£EventGraphÔÇØ create a new ÔÇ£InputAxisÔÇØ using our ÔÇ£SwimUpÔÇØ mapping.

16. Right click in the ÔÇ£EventGraphÔÇØ and search for ÔÇ£InputAxis SwimUpÔÇØ

17. Now create a new ÔÇ£Add Movement InputÔÇØ node and set the world direction of Z =1.0

18. Connect the pins to their respective locations. Use the below image as reference.

Blueprint Input Action

19. Save all your work.

20. Launch PIE (Play in Editor)

21. Start Swimming

Pool time!

Thanks for following along! I have written some more tutorials you can check out by following the links within my Wiki Profile page found below.

Andrew Hurley Wiki Profile Page