Using the Unreal Engine eye shader with Daz characters?

Has anyone been able to use the Eye shader and materials that come with the UE4 digital human sample, on a Daz character that they have brought into Unreal? I saw someone mention this as a tip on Youtube but I have no idea how I would use it on a Daz character when the eye is split up into different materials. Also I can't seem to find the actual static mesh for the eye in the Digital Human project. Many thanks

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  • UpL8RenderingUpL8Rendering Posts: 129
    edited September 2020

    Hello. We got this working on the Daz To Unreal Discord.

    I will post the solution here as well. I also updated some pictures and steps.

    Post edited by UpL8Rendering on
  • UpL8RenderingUpL8Rendering Posts: 129
    edited September 2020

    Remove the eyes in Daz Studio

    In Daz Studio go to Tools - Geometry Editor

    Right click on your character and choose: Geometry Selection -> Select by -> Face Groups -> lEye

    Right click on your character again and choose: Geometry Selection -> Select by -> Face Groups -> rEye

    Right click on your character a third time and choose: Geometry Editing -> Delete Selected Polygon(s)


     

    Send to - Daz to Unreal as usual

    Post edited by UpL8Rendering on
  • UpL8RenderingUpL8Rendering Posts: 129
    edited September 2020

    The Digital Human project eyes are built into the head mesh so that won't work but the Content Examples project has a really good eye example.

    You can find the Content Examples project in the Epic Games Launcher - Unreal Engine Learn Tab

    Click the cloud icon to download and create a project from it.

    Open the Content Examples Project. In the maps folder find and open the Character_Rendering Map.

    Click on the SKM_Eye_00 mesh (Either in the Viewport or World Outliner)

    In the Static Mesh panel click on the magnifying glass

    This will bring you to where the eye static mesh is in your Content Browser

    To Migrate the model and all its materials and textures into your project:

    From the Content Browser right click on SKM_Eye_00

    Mouse over Asset Actions then select Migrate

    this will show you a list of item that will be migrated - Click OK

    Browse to your game's project folder - click on your Content folder and click Select Folder

    The eye mesh, materials, and textures can now be used in your game.

    Post edited by UpL8Rendering on
  • UpL8RenderingUpL8Rendering Posts: 129
    edited September 2020

    In your Character Blueprint

    Select the character mesh either from the viewport or the component list in the upper left.

    Drag the SKM_Eye_00 mesh into your blueprint.

    In the details panel on the right: Find Sockets - Parent Socket

    Click the little magnifying glass to get a list of bones and search for and select lEye

    Scale and Rotate as needed

    Re-Select the character mesh and do the same for the right eye - Parent to rEye of course :)

     

    Post edited by UpL8Rendering on
  • UpL8RenderingUpL8Rendering Posts: 129
    edited September 2020

    They say the eyes are the windows to the soul so if you still want to use the Daz textures that make your character unique you can do that too!

    Find the textures you want to use. You can find them in:

    Daz3DFiles\Runtime\Textures\DAZ\Characters\Genesis8\(CharacterName)

    Note: Some character paths may be a bit different searching for *eye in the texture folder will pull up all of them.

    I very much recommend copying the textures to another folder before editing so I don't risk making changes the original files.

    Open the texture up in an image editor (I'm using Gimp)

    Select just to the outside portion of the iris color

    Copy selection and Create New from clipboard

    Scale the new image down to 512x512

    if the irises aren't already filled in use the color picker to get a color sample just inside the iris color (Usually black but might be slightly lighter)

    Bucket fill that color (Set the threshold amount to control how much gets filled in)

    Do a little cleanup with the pencil or paint tool

    Export your new texture and import into your UE project

     

    Post edited by UpL8Rendering on
  • UpL8RenderingUpL8Rendering Posts: 129
    edited September 2020

    Back in your Character Blueprint:

    With one of the SKM_Eyes selected go to the Materials section click on the little magnifying glass to find the Material Instance being used

    Open the Material Instance. In the Texture Parameter Values find the IrisColor

    From here you have a couple options

    You could simply replace the IrisColor texture with your Daz iris texture

    AND THEY ARE B-E-A-U-T-I-F-U-L-!!!

    This would become the default texture everywhere that material instance is used.

    Or, if you would like to be able to change the texture dynamically go into the Construction Script of your character Blueprint

    Create a Dynamic Material Instance Node

    Set the Parent material to M_Sparrow_EyeRefractive_Inst

    You can either find it in the drop down menu, drag it in from the content browser and land it into that spot, or select it in the content browser and click the little arrow to the right.

    Pull off from the Return Value and Promote to Variable

    This will create a reference to the Dynamic Instance Material we are creating so we can use it later.

    Next create a Set Texture Parameter Value node, put IrisColor as the Parameter Name, and pull off from Value and Promote to Variable

    Name the Variable Iris Texture

    Add a Set Material Node

    From the Component tab in the upper left drag in SKM_Eye_00 and SKM_Eye_01 and connect them both to target

    Connect from Set Eye MID variable to the Material pin on the Set Material node

    Compile the Bluepinrt

    Click back on the Iris Texture variable and set the texture you want to use.

    In the list of variables on the left click the little eye icon to the right of Iris Texture to make the variable Public

    Also check Instance Editable in the upper right.

    Checking those two boxes will let you change the the texture for each instance of the Blueprint you place in the level.

     

    In the Variable Details panel if you also check Expose on Spawn you will be able to set the texture when spawning your Blueprint into the level

    Post edited by UpL8Rendering on
  • UpL8RenderingUpL8Rendering Posts: 129
    edited March 2021

    Batch Crop and Resize textures

    I like to use IrfanView for it's Capture/Screenshot and Batch Conversion/Rename features.

    I have to admit I found it quite meta to be using IrfanView's Capture/Screenshot feature to capture screenshots of IrfanViews Batch Conversion/Rename features for this part of the tutorial.

    We will start back in Gimp

    With the rectangle slection tool still active and positioned arround the pupil as described above find the position and size on the left hand side.

    In this case position is 317 and 2347 and the size is 1400 x 1400

    In IrfanView gup to to file and select Batch Conversion/Rename

    In the Batch conversion menu click Advanced

    Put a check mark next to Crop and fill in the position and size you got from Gimp

    Also make sure there is a check mark next to Resize and set the new texture size to 512 * 512 (higher or lower depending on your needs)

    Click OK

    Again, I would recommened copying your characters eyes to another folder to make sure you don't accidently write over the original files.

    Once done go up to the top of the menu and set "Look in" to the folder where you copied those files.

    If you click Use current ("Look at") folder then the new files will apear in the same folder. Or you can browse to select a different folder for the new files.

    Click Options to set the naming format for these new files.

    In this case we will use $N to reuse the old file name first then _512 to add the size of the new file to the old name

    The result will be something like Darius8Eyes02D_1006_512.png

    Click OK

    Next click Add all to add all these files to the batch

    Click Start Batch

    When the batch is finished you can either click Exit Batch to close down IrfanView or Return to batch to make further adjustments or do some more.

    Go back into gimp to fix the white space in the pupil like before and import into Unreal

    Post edited by UpL8Rendering on
  • UpL8RenderingUpL8Rendering Posts: 129
    edited March 2021

    Changing textures in game

    To change texture in game their are a few methods. Here is one of those.

    Go back into your Character Blueprint and create a Custom Event node

    Change the name to something like Change Iris Color

    Add a New Paramter Input

    Set the Input Variable type to Texture and choose Object Reference

    Name the variable Iris Texture

    Go into the Construction Script and select all but the Construction Script node

    Right click and Copy these nodes.

    Paste them into your Event Graph and delete the Iris Texture variable

    Connect the New Texture pin from the Change Iris Texture node to the Value input of the Set Texture Parameter Value node

    Go back into the Construction Script and create a Change Iris Color node

    Drag in the Iris_Texture variable from the left and connect to the New Texture input

    This will execute the Change Iris Color - Custom Event you created in the Event Graph when the character is dragged into or changed in the level.

    We will be using the Level Blueprint to make pressing the 1,2,3,4 keyboard keys change your character eye texture.

    This setup could also be put into a player controller instead.

    Go up to Blueprints and select Open Level Blueprint

    We need a way for the Level Blueprint to know which of the characters in your scene to change

    If the character is already in the scene click on them or select them in the World Outliner panel.

    In the Level Blueprint right click and create a reference to your character

    OR

    you can spawn a new character into the scene then pull off from the Return Value and Promote to Variable

    Name this variable Spawned_BP

    Almost there!!!

    Still in the Level Blueprint right click in the Event Graph and press the number one key

    Under Keyboard Events click the number 1

    Do the same for 2,3, and 4

    Using either the Spawned_BP variable or the reference variable to the character in your scene you created earlier

    Pull off the pin and create a Change Iris Color node

    Pull off from the New Texture pin and Promote to Variable

    Name the Variable New Iris Texture

    Create four nodes to Set the New Iris Texture variable

    Connect them to the Pressed output of the 1,2,3 and 4 nodes

    In each of the Set New Iris Texture nodes change the texture to something different.

    Now when playing the level if you press 1,2,3 or 4 the New Iris Texture variable will get set in your Level Blueprint and the Change Iris Texture Custom Even of your character will be called and the new texure will be applied.

     

    Post edited by UpL8Rendering on
  • @UpL8Rendering you are a legend. Thanks for taking the time to create this tutorial.

  • We were able to do an eye swap as we have a need to post process heads from Daz G3. Export as normal with out eyes into Unreal 4. Export from Unreal 4 the modified version with the renamed root to "root" Add a set of eye objects edited from one of the Paragon characters, We use Sparrow as it has a near perfect fit. and rig it to the G3 rig.. Select the character, rig and eyes and export to FBX. In Unreal 4 set the character imported to combine mesh and re import the mesh. Your character should now be combined with Unreal mapped eyes and you can use any of the Paragon eye materials, and I assume the MetaHuman as it "seems" to use the same material base. 

    Yet to be tested but it should work and I just need to find time to test the theory.

    No reason Epic based eyes could not be imported into DS as a prop, added to the base character, and sent to Unreal 4.

    The skin material used by MetaHuman on first look is also based on the realistic skin material used in the digital human project and swamping in G3-G8 textures might produce interesting results.

  • GutoCrafts said:

    @UpL8Rendering you are a legend. Thanks for taking the time to create this tutorial.

    You're welcome.  It was a question I had seen a few times so I thought it might make a good tutorial.

  • frankiev888_28b3c399af said:

    We were able to do an eye swap as we have a need to post process heads from Daz G3. Export as normal with out eyes into Unreal 4. Export from Unreal 4 the modified version with the renamed root to "root" Add a set of eye objects edited from one of the Paragon characters, We use Sparrow as it has a near perfect fit. and rig it to the G3 rig.. Select the character, rig and eyes and export to FBX. In Unreal 4 set the character imported to combine mesh and re import the mesh. Your character should now be combined with Unreal mapped eyes and you can use any of the Paragon eye materials, and I assume the MetaHuman as it "seems" to use the same material base. 

    Yet to be tested but it should work and I just need to find time to test the theory.

    No reason Epic based eyes could not be imported into DS as a prop, added to the base character, and sent to Unreal 4.

    The skin material used by MetaHuman on first look is also based on the realistic skin material used in the digital human project and swamping in G3-G8 textures might produce interesting results.

    I have checked out a couple Paragon characters but not the MetaHuman stuff yet. Mixing and matching materials, textures, and parts would be very interesting. Please let us know how your experiments turn out.

  • MalachiMalachi Posts: 11

    UpL8Rendering said:

    The Digital Human project eyes are built into the head mesh so that won't work but the Content Examples project has a really good eye example.

    You can find the Content Examples project in the Epic Games Launcher - Unreal Engine Learn Tab

    Click the cloud icon to download and create a project from it.

    Open the Content Examples Project. In the maps folder find and open the Character_Rendering Map.

    Click on the SKM_Eye_00 mesh (Either in the Viewport or World Outliner)

    In the Static Mesh panel click on the magnifying glass

    This will bring you to where the eye static mesh is in your Content Browser

    To Migrate the model and all its materials and textures into your project:

    From the Content Browser right click on SKM_Eye_00

    Mouse over Asset Actions then select Migrate

    this will show you a list of item that will be migrated - Click OK

    Browse to your game's project folder - click on your Content folder and click Select Folder

    The eye mesh, materials, and textures can now be used in your game.

    Sorry to necro this thread, but the Character Rendering map in the Content Examples project has been removed. Does anybody know of any other way to use the Metahuman eyes on a Daz character? I know of the Epic Eyes Geometry github project, but that's only for G8/8.1. I'm looking to use Genesis 9 with metahuman eyes.

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