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Tutorial 3 for Repainting Mesh UVs (Texture Transfer)


With the release of Genesis 9 from Daz Studio, both the UVs and mesh geometry have changed since the last generation. This quick tutorial will show how to repaint the UVs of any Genesis 8 model to Genesis 9.

To begin, download and install the Unwrap 3D import/export plugin for Daz Studio. Exporting to .U3D format from Daz Studio is recommended over other formats, such as .OBJ, as it saves extra texture channels, such as translucency.


Prepare Genesis 8

In Daz Studio, load the Genesis 8 base character. In the Parameters tab, set General | Mesh Resolution | Resolution Level to Base.

tut_repaint3_1.png

Click on the Currently Used section in the Parameters tab, and make sure no extra morphs are applied. For custom characters, set all head morphs and full body morphs to zero. At this point, you may apply a custom material set to the Genesis 8 base character for export.

In the Scene tab, delete the Eyelashes mesh, found under the Genesis 8 figure.

tut_repaint3_2.png

Now, export it to a U3D file. Call it gen8_base.u3d.

When exporting, check the option called Collapse UVs (UDIM Tiles). This is to ensure that UVs stay within 0 to 1:

tut_repaint3_3.png

Clear and reset the scene.


Prepare Genesis 9

In Daz Studio, load the Genesis 9 base character. Set the Resolution Level to Base.

Before we can export, we must make preparations to the character's shape and pose, so they match the Genesis 8 character, as closely as possible. For the shape, we can use the built-in clone shape morphs that come with Daz Studio. These clone shapes are hidden, so first make the hidden properties visible in the Parameters menu pane:

tut_repaint3_4.png

Now, in the Parameters tab, set Genesis 9 | Hidden | Clones | Genesis 8 Female to 100.

tut_repaint3_5.png

For the pose, load the Genesis 8 base character into the same scene, so we can compare its pose with Genesis 9. Set the Side-Side value of the left thigh and right thigh to 6.5 and -6.5, respectively:

tut_repaint3_6.png

Now, delete the Genesis 8 character from the scene. Also delete all meshes under the Genesis 9 figure (eyelashes, tear, eyes, mouth, eyebrows):

tut_repaint3_7.png

Now, export it to a U3D file. Call it gen9_as_gen8_shape.u3d. Check Collapse UVs (UDIM Tiles) and uncheck Export zero figure pose. This is to preserve our pose:

tut_repaint3_8.png



Repainting UVs

Before we begin, uncheck Options | Preferences | Textures | Limit texture size. Otherwise, texture size may be limited when loading them.

Now, we are ready for repainting. In Unwrap3D, click File | Export | Repaint Mesh UVs. Load gen8_base.u3d as the Source Model, and load gen9_as_gen8_shape.u3d as the Target Model. Set the output width and height to 4096 x 4096. Set the iterations to 32 or greater, as we will be creating large textures.

Set the Target Material to the Head material. Then click the Convert button:

tut_repaint3_9.png

After repainting, save your results to file.

By default, the diffuse map is repainted, but we can also repaint other maps, such as bump, specular, and translucency. Set Choose Texture Map Channel to the desired texture map type, and repaint again.

From here, we can continue repainting the head, body, arms, legs, fingernails, and toenails. A helpful tip to speed up repainting, is to deleted unnecessary geometry.


Final Results

In Daz Studio, we can load the Genesis 9 base character. Then, clicking on the Surfaces tab, we can replace the appropriate maps with our repainted maps:

tut_repaint3_10.png

tut_repaint3_11.png

No seam lines are visible, so everything looks ok.

Note that Genesis 9 characters may be using a PBR skin shader, while Genesis 8 characters may be using a Iray Uber shader, so be aware, there may be color differences if you're applying the same texture using a different shader.

That's it! If you have any other questions about repainting mesh UVs, please let us know.




 
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