Master 3D Virtual Human Creation: Shading, Baking, Rigging & Animation

Material Shading

The workflow starts with Blender's material node editor to give the character realistic skin. Vertex colors and subsurface scattering are added to a Principled BSDF node, an Ambient Occlusion (AO) node creates subtle shadows, and a gradient node refines the shadow depth. Highlights are controlled with a Geometry node and a Gradient node, and a subsurface color node adds translucency.

Body Material Steps

Set the world background to a light gray, providing uniform lighting without additional lamps.

Add a Principled BSDF node and connect an AO node; use a Gradient node to adjust shadow intensity.

Insert a Geometry node and a Gradient node to shape the skin highlights, then blend them with the base color.

Apply a subsurface scattering node, paint vertex colors for thin‑area translucency, and connect the result to the Subsurface input.

Eye Material

The eye material combines three parts—white sclera, cornea, and blood vessels—into a single shader to reduce draw calls. The white base uses a Principled BSDF with low roughness. The cornea’s transparency is driven by a gradient texture, while blood vessels are created with a Voronoi texture blended with noise and tinted red.

UDIM Baking

Baking transfers high‑resolution details to low‑poly meshes for real‑time use. The SimpleBake plugin streamlines the process: ensure UDIM tiles are set, select the appropriate UVMap, choose map types (Diffuse, SSS, Normal, etc.), set resolution, and click Bake PBR Maps. The resulting textures can be refined in Photoshop or directly in Blender.

PBR Texture Setup

After baking, the textures are connected to the Principled BSDF node as follows:

Base Color : insert the diffuse map and set the color space to "Color".

Roughness : connect the roughness map, set the color space to "Non‑Color"; optionally add a Gamma node to fine‑tune surface roughness.

Normal : feed the normal map into a Normal Map node, then into the Normal input (Non‑Color).

Metallic : plug the metallic map into the Metallic input (Non‑Color).

Ambient Occlusion : multiply the AO map with the Base Color using a MixRGB node (second color input) to add soft shading.

Facial Rigging with Faceit

Faceit provides a semi‑automatic pipeline for facial rigging and animation:

Register all facial meshes (head, eyes, teeth, tongue, eyelashes, etc.).

Assign vertex groups: mandatory groups (head, left/right eye) and optional groups (teeth, tongue, eyelashes, rigid).

Place landmarks on the mesh to define key facial points.

Generate the rig from landmarks; adjust any misplaced bones via the "Back to Landmarks" tool.

Bind weights and bake shape keys using the Bake shape keys button, preserving all Faceit expressions.

Export or import expression sets, load ARKit, A2F or custom expressions, and edit them non‑destructively.

Body Rigging and Weight Painting with Auto‑Rig Pro

Auto‑Rig Pro automates skeleton creation and skinning for the body:

Apply all transforms and merge the body mesh into the head mesh.

Center the model at the world origin (0,0,0) and face the –Y axis.

In the Smart panel, click "Get Selected Objects" and add markers for neck, chin, shoulders, wrists, spine root, and ankles.

Specify finger bone count and press "Go" to generate the full skeleton.

Bind the mesh to the armature (Skin → Bind) and paint weights to correct any local issues.

Animation

Pre‑made animations can be imported from online libraries:

Mixamo : export FBX files, then import into Blender and retarget to the Auto‑Rig Pro skeleton.

Atorcore : download FBX or other supported formats, import, and map the animation to the character using Auto‑Rig Pro.

Audio‑Driven Facial Animation (NVIDIA Audio2Face)

The Audio2Face workflow creates facial motion from audio:

Open the default Audio2Face scene and drag the USD model (e.g., male_bs_46.usd) into the viewport.

Set the input mesh (high‑poly) and the target blendshape mesh.

Run the blendshape solver, load an audio clip, and let Audio2Face generate the animation.

Export the result as a .json file for later import into Blender.

Conclusion

The article provides a step‑by‑step, production‑ready pipeline for 3D virtual digital humans, covering realistic PBR shading, efficient UDIM baking, robust facial and body rigging with Faceit and Auto‑Rig Pro, and both library‑based and AI‑driven animation techniques, enabling creators to deliver high‑quality, expressive characters.