Sunday, July 25, 2021

Adding morphs after lashes and geografts have been merged

 These days I mostly use Easy Import to get my DAZ characters into Blender, with a list of favorite morphs. Alas, it quite often happens that I find that there is some additional morphs that I want to load. Since eyelashes and often geografts have already been merged with the main character mesh, this has not been possible because the mesh topology has been changed. Until now.

In the development version it is now possible to add new morphs, even if the character mesh has been changed in certain ways. More precisely, it works if

  • Eyelashes (or other meshes) have been added to the mesh with the join command.
  • Geografts have been merged with the Merge Geografts tool.
  • Vertices have been added to the mesh in edit mode.

It does not work if some vertices have been removed from the mesh in edit mode. Removing vertices changes vertex numbers which are used when loading morphs. The Merge Geograft button removes vertices too, but in this case the mesh keeps a list of associations between current and original vertices.

Morphs are only loaded to the original vertices, or what remains of them. This means that it is not meaningful to load FBMs to a mesh with merged geografts, or FHMs to a mesh with merged lashes, because the shapekeys cannot be transferred. But FBHs and FHMs usually involve changes to the armature rest pose which cannot be loaded anyway.

This is an advanced feature since it is quite easy to import faulty shapekeys if the mesh has been accidentally changed, and therefore it is turned off by default. To turn it on, enable the Load To Modified Meshes global setting.

I have been using this feature for a couple of days and find it very useful, although I am not sure about best practice yet. Perhaps one should keep eyelashes as a separate mesh, in case one wants to transfer shapekeys to them later.

Tuesday, July 13, 2021

Changing Outfits

Engetudouiti requested a tool for changing armature modifiers, in order to change clothes of a given character. Using different outfits for the same character is something that I have thought about myself. There are several ways that can be done, but all have their own disadvantages.

One possibility is to create a super-outfit that contains all outfits that the character will ever need, and then put the indidual outfits in subcollections that can be excluded from the scene when not used. This makes the file very heavy, and it takes a long time to load it. It also requires exceptionally good planning. If we later realize that we want to add another outfit to the character, the entire super-file must be reloaded.

Another possibility is to create separate files in DAZ Studio, one for each outfit, starting from the same nude character. This is the method that I have used a lot recently, but it also means work duplication. For each outfit, all morphs must be reloaded. This may not involve much manual work if you use easy import and favorite morphs, but if you then tweak the character in Blender, those tweaks must be repeated for each outfit.

In this post I will describe a third method, which is both flexible and avoids work duplication. The idea is to import the nude character only once, and then import each outfit from a separate file and merge the outfit with the nude character.


DAZ Studio

In DAZ Studio we will create the following files:

  1. The shape file which only contains the character itself. Not even the eyelashes need to be included in this file.
  2. The nude file which contains everything that makes up the nude character: body, eyelashes, hair, geografts, and geometry shells.
  3. One file for each outfit.

Create the character shape. Save the file as aiko-shape.duf. We do not need to export this file to Blender.

Complete the nude character by adding hair, geografts, and geometry shells. Save the file as aiko-nude.duf and export the file to Blender (aiko-nude.dbz).

If we have several shells it may be necessary to change the visibility of some surfaces.

Open the file aiko-shape.duf again and add the first outfit. Save the file as aiko-basic-wear.duf and export to Blender.

Open the file aiko-shape.duf again and add the second outfit. Save the file as aiko-bardot.duf and export to Blender. Your directory should contain the following files:

We are now done in DAZ Studio and switch to Blender.


Import the nude character

We will use Easy Import to import the duf files into Blender. Below the Easy Import DAZ button we have a field where the path to the favorite morphs can be specified. If we press on the folder icon to the right, a file selector opens where we can choose the path to the file with favorites.This button is located in the panel because a file selector can not be lauched from inside another file selector.

Select the aiko-nude.duf file and make the following settings:

  • Merge Rigs: We need to merge the eyelash, hair and geograft rigs with the main rig.
  • Use Favorite Morphs: The path to the favorite morphs that we specified before appears here too. However, there is no folder icon since we cannot lauch a file selector from here.
  • Transfer Shapekeys: Disabled, because there are no clothes that we need to transfer shapekeys to. If enabled, the tool will try to transfer shapekeys to the hair which normally unnecessary.
  • Merge Geografts: Shapekeys whose body part setting is Body or All are transferred to geografts before merging, even though Transfer Shapekeys is off.
  • Merge Lashes: Shapekeys whose body part setting is Face or All are transferred to eyelashes before merging, even though Transfer Shapekeys is off.
  • Rig Type: Set to DAZ.  This is necessary because the Copy Pose tool that we will use later does not work with the MHX or Rigify rigs. Rig conversion can be done manually in the last step.

After some time (a few minutes) the nude character appears in Blender. Save the file as aiko-nude.blend.


Import the first outfit

Open the nude file again and save it as aiko-basic-wear.blend. Open the Easy Import tool and select the aiko-basic-wear.duf file. This time we set the clothes color to  blue and only enable the first three options.

Now we have two collections: the nude collection and the basic wear collection that we just imported. The character mesh in the second collection has now served its purpose and can be deleted.
Select the clothes and press Retarget Armature Modifiers
 
In the popup dialog, select the rig in the nude collection, which Blender has renamed to Aiko 8.002. This changes the targets of all armature modifiers, and also the parent object. Move the collection with the meshes to the Aiko-nude collection, and give it a better name. The remaining objects in the Aiko-basic-wear collection are not needed anymore and can be deleted.
We can pose the character to confirm that the clothes is controlled by the same armature as the body and hair. One final step is needed before we are done: shapekeys must be transferred to the clothes.
With the clothes selected and the body mesh active, press Transfer Shapekeys in the Morphs section.
Since the clothes only cover the body, we set the Body part field to Body. This singles out the JCM morphs which what we want to transfer.

And now the skin is not poking through when the character is posed.


Import the second outfit

The Bardot outfit will pose some new problems.

 

 Open the file aiko-nude.blend again and save it as aiko-bardot.blend. In Easy Import we again leave the three first options enabled and import the file aiko-bardot.duf, and then remove the extra body mesh that we don't need.

The first issue is that the feet and the sandals have different rest poses.
With the body armature selected and the clothes armature active, press Copy Pose. This will pose the body armature so it fits the shoes. Unfortunately, the Copy Pose tool only works with straightforward rigs such as the native Genesis rigs, but it does not work with MHX and Rigify. This is the reason why we set the rig type to DAZ in Easy Import.
The foot is now posed so it fit into the shoes, but the rest pose has not changed. To fix this, press Apply Rest Pose. This is the same button that appears in the Corrections section, but is duplicated here for convenience.

We can not use the Retarget Armature Modifiers tool this time, because the Bardot skirt has extra bones that must be merged with the body rig. Instead we use the Merge Rigs tool in the Corrections section. Note that this time the armatures must be selected in the opposite order: clothes rig selected and body rig active. In the Merge Rigs option, deselect the Create Mesh Collection option.

 

Now we can pose the dressed character, and use the extra bones to keep the skirt from penetrating the legs.

As mentioned above, we cannot use the Copy Pose tool with the MHX or Rigify rigs, so we must convert the rig manually when everything else is done.


 

 

Sunday, June 27, 2021

Voluminosity and Material Editor

The Daz Importer creates somewhat non-standard skin materials in order to make them as faithful to Daz Studio as possible. In particular, the BSDF method uses translucency and voluminosity nodes the match the translucency in Iray

This setup is quite non-standard for Blender skins, and may lead to longer render times, but in some cases it is necessary. The picture below shows Victoria 8, rendered in Blender with and without the voluminosity node.

However, it is quite easy to modify the skin to the right to something good-looking, using the material editor. Before importing the character, we need to turn off the Volume option in the global settings dialog, so the voluminosity nodes are not generated.
Modifying the node trees manually is quite cumbersome, because Daz skin consists of many materials, and we need to make changes consistently over all skin materials. Instead we can use the material editor, which has been improved recently. Start it by pressing Launch Material Editor in the Setup > Materials section. Before doing so, select the material that the editor uses as a blueprint. In this case we choose the Face-1 material.
At the top of the editor window we select the materials that will be affected by the changes. Clearly we only want to tweak the skin, lip and nail materials, and leave the eye and mouth materials unchanged. We can select the individual materials, but it is more convenient to use the Skin-Lips-Nails button to do this. The active material Face-1 is shown below the list of affected materials.
We then open the Translucency group, and change the Cycles Mix Factor to 1.0 and the SSS color to a light grey.
The mix factors determine whether the DAZ Translucent group uses translucency or sub-surface scattering, or a mixture of both. 0.0 means pure translucency, which works well together with the volume nodes, and 1.0 means pure SSS. Since we didn't generate any volume nodes, the Cycles Mix Factor is set to 1.0, i.e. pure SSS.
Finally we hit the Update Materials button. The result is not bad for a first attempt, considering that we only changed two parameters.
If we go back into the shader editor, we can see how the updates affect the node trees.
The Update Materials button does not close the material editor, so if we are not happy with the result we can continue to tweak the parameters. Here we changed the SSS color to a slightly reddish tone.

Friday, June 18, 2021

Winders Update

A winder is a control bone that bends multiple parallel bones by the same amount. It is used in the MHX rig for fingers (a single finger bone bends all three finger links) and for the spine (the back bone bends three or four spine bones). It can also be useful in other contexts, e.g. for male genitals or for ponytails, as was discussed in a previous blog post

Winders are also useful for rigged hair, but here we often need to create several winders, one for each chain of links. Previously that was rather cumbersome, because the Add Winder tool had to be run for each chain, with the root of the chain active. With the latest update, several  bones can be selected at once, and the tool automatically figures out which bones are the chain roots.

Select the bones that we want to make winders for. This is usually quite easy, because the Merge Rigs tool puts non-standard bones on a separate layer. Press the Add Winders button.
The option box lets us select the bone layer where the winders live.
We can now quickly pose the hair with the winders.
The winder pose results in a quite complex pose for the original deform bones, which would be tedious to create by hand. However, the individual bones can still be posed on top of the winder pose, if we want to refine the pose.

Sunday, June 6, 2021

Add-On Updater Removed

 For some time the Daz Importer has used the Blender add-on updater from CGCookie to let users automatically update the add-on to new versions. However, there are some problems with this.

  1. The add-on updater is not my code and I don't feel comfortable to include code which I don't understand.
  2. The Daz Importer consists of python files (.py), JSON files (.json) and Daz Studio scripts (.dsa). Python and Daz Studio files are updated correctly, but JSON files are not. This could be because I didn't configure the add-on updater correctly, or because the updater uses JSON files internally and therefore treats them differently from other files. In any event some files were not updated correctly.
  3. Including the add-on updater is not strictly legal, since it is licensed under GPL and Daz Importer uses a more liberal BSD-type license. It would not be a big deal for me to change the Daz Importer License to GPL, but since the add-on is intended to work as a bridge between commercial and open-source software, I prefer a license that works nicely with both.
  4. It does not work with Blender 2.93.

The last problem was reported some time ago. Exactly what goes wrong is not clear to me, since my main computer cannot start Blender 2.93 due to some missing dll. But in view of the other problems with the add-on updater, I have decided to remove it completely now when Blender 2.93 is officially released. It has also been removed from the stable version 1.5.1.

Friday, May 21, 2021

On Raw and Final Slider Values

In both DAZ Studio and in Blender morphs are controlled with sliders, but those sliders don't behave in the same way. In DAZ Studio a slider can change another slider, but the latter can also be changed independently. Something similar does not really exist in Blender; either the slider is driven by something else, and in that case it cannot be changed at all from the viewport, or the slider is not driven and cannot be modified by another slider.

However, there is a way to make sliders behave almost as they do in DAZ Studio, using an extremely clever trick devised by frequent commenter engetuduouti. This method uses two Blender properties for each DAZ slider: the "raw" value which can be manipulated in Blender, and the "final" value which reproduces the slider value in DAZ Studio. Unfortunately, understanding how these raw and final sliders work is quite unintuitive, but hopefully the present post can bring some clarity.
In order to see the final values, we must enable Show Final Morph Values in the Global Settings.We will also change the Slider Limits to Custom, which will allow us to use negative values for the raw sliders; the Final Limits should be left at DAZ.

We will consider the three standard face morphs which close the eyes. In DAZ Studio, we set Eyes Closed Left to 50%. Aiko's left eye is now half-closed.
In Blender we do the same thing (something has happened to the morph names, they should be the same as in DAZ Studio). The EyesClosedL slider is set to 0.5. However, it is the final values next to the sliders that matter for the morph; the final values show the values of the sliders in DAZ Studio. In this case the raw and final values are the same, but they will differ below.
In DAZ Studio, we now drag the Eyes Closed slider to 50%. That automatically increases the left and right sliders with 50%, to 100% and 50%, respectively. Note that in this step only the Eyes closed slider was moved.
In Blender we do the same things and increase the EyesClosed slider to 0.5. The other sliders are unchanged, at 0.5 and 0.0, respectively. However, we see that the final values to the right have been changed and agree with the slider values in DAZ Studio. Also we see that the pose is correct.
Finally we move the left and right sliders, so Aiko's left eye is fully open and her right eye is closed. So the left slider is decreased by 100% to 0%, and the right one is increased by 50% to 100%. The combined slider is not touched and remains at 50%.

Now we do the same thing in Blender. The left slider is decreased by 1.0, from 0.5 to -0.5, and the right one is increased by 0.5, from 0.0 to 0.5. The final values and the face pose are the same as in DAZ Studio, but the connection to the raw sliders is not so intuitive.

We can summarized the three steps above by the increments:

  1. Left increased 50%.
  2. Combined increased 50%.
  3. Left decreased 100%, right increased 50%.

Sunday, May 16, 2021

Favorite Morphs and Easy Import

Update 2021-05-21: 

The concept has been renamed from Morph Preset to Favorite Morphs, because a morph preset denotes something completely different in DAZ Studio: a combination of morphs that give a certain expression. The names of the buttons has thus been changed to Save Favorite Morphs and Load Favorite Morphs, and the Easy Import option is called Use Favorite Morphs. 

In fact, morphs presets in the DAZ Studio sense can be saved with the Save Pose Preset, and can then be used both in DAZ Studio and in Blender.
 

Original post:

It is now possible to store a collection of morphs as a morph preset, which can be reused for other characters of the same type. A preset consists of any combination of standard and custom morphs for a genesis character, plus custom morphs for associated geografts and clothes.
Morph presets are normally stored in a directory specified in the global settings.
To create a morph preset, we import a character of the Genesis generation that we want to make the preset for. The character must also have any geografts and clothes that we want to include in the preset.
The buttons for saving and loading morph presets are found in the Morphs section of the Setup panel.
Select the parent rig and press Save Preset. A file selector opens up in the directory specified in the global settings. Choose a name for the preset and save the file.
Now load a different character, which however belongs to the same Genesis generation. Select the rig and press Load Morph Preset, and select the preset file that we just created. All morphs are loaded to the new character.

Morph presets are of somewhat useful by themselves, but their main use is in combination with Easy Import. Morphs must be loaded while bone names and meshes are still intact. This means that morphs must be loaded before geografts and lashes are merged with the main character mesh, and before the armature is converted to some more animator-friendly rig like MHX or Rigify. The used to limit the usefulness of Easy Import, because only standard morphs could be loaded at the right time. If we wanted to load custom morphs, the last steps had to be done manually, after the custom morphs were loaded.

With morph presets, this is no longer a limitation.
In the Easy Import options, enable Use Morph Preset. The checkboxes for standard morphs disappear, and instead a field appears were we can specify the morph preset file. The file is relative to the global morph preset directory, unless an absolute file path is specified.

We can now enable Transfer Shapekeys, Merge Geografts and Merge Lashes, knowing that these operations will be performed after all morphs have been imported. We can also choose a rig type which changes bone names like Rigify.

And now a animation-ready character is loaded with all the morphs in the morph preset.