Dyntopo for Efficient Sculpting

The Sculptor's Dilemma: Detail vs. Performance

In digital sculpting, the surface of your model is made of polygons (quads and triangles).

• Low Resolution: Fewer polygons mean a smaller file size, better performance, and smoother deformations for posing. However, you can't sculpt fine details.
• High Resolution: Many polygons are needed to capture crisp details like wrinkles, scales, or fabric textures. However, this makes the model heavy, slow to work with, and difficult to pose.

Traditionally, sculptors manage this by either subdividing the entire model to a high resolution (using the Multiresolution feature) or by periodically recalculating the entire mesh to have a uniform polygon density (using the Voxel Remesher). Both methods work, but they can be disruptive. Voxel remeshing requires you to constantly pause your sculpting to "remesh," and subdividing the whole object can make your device struggle if you only need detail in one small area.

To see the "old" workflow in action and understand the problem Dyntopo solves, the video below gives an excellent demonstration of sculpting with constant voxel remeshing.

Dynamic Topology: The Smart Solution

Dynamic Topology, or Dyntopo, is an alternative mode that automatically adds or removes polygons under your brush as you sculpt. If you carve a fine line, Dyntopo adds tiny triangles to support that detail. If you smooth an area out, it removes unnecessary polygons to keep the mesh lightweight. This means you get resolution exactly where you need it, when you need it, without interrupting your creative flow.

The official Nomad Sculpt manual provides a concise and accurate technical description of this feature.

To see this in practice, the next segment of the SouthernGFX video demonstrates Dyntopo beautifully. You'll see the mesh changing in real-time as the artist sculpts.

Key Dyntopo Settings

To use Dyntopo effectively, you need to understand its core settings, located in the Topology menu.

• Enabled: The main toggle to turn Dyntopo on or off. Once enabled, a small "DynTopo" icon appears in the top left UI, allowing you to quickly toggle it for each tool.
• Detail: This slider controls how dense the new geometry will be. Its behavior depends on the mode selected in "Detail based on...":
  • Screen: The density is relative to your zoom level. Zoom in for more detail, zoom out for less. This is intuitive for adding broad strokes from a distance and fine details up close.
  • Radius: The density is determined by your brush size. A smaller brush creates smaller polygons (more detail). This is great for tools like Crease where you naturally use a small brush for fine lines.
  • Constant: The density is a fixed value, regardless of zoom or brush size. This provides the most predictable and consistent results.
• Method: This determines what Dyntopo is allowed to do.
  • Uniformisation: The default mode. It both adds and removes polygons to match the target detail level.
  • Subdivision: Only adds polygons. It will never simplify the mesh, even when smoothing.
  • Decimation: Only removes polygons. It's like a localized simplification brush.

For most of your work, you will likely use Uniformisation with either Screen or Constant detail.

Practical and Efficient Dyntopo Workflows

Knowing the settings is one thing; using them efficiently is another. Here are some professional workflows.

1. Free-form Sculpting and Detailing

This is the primary use case. Start your sculpt, enable Dyntopo, and just focus on building your forms. Use the Clay, Move, and Inflate tools without ever worrying about stretched polygons. When you're ready to add surface details like wrinkles, veins, or texture, simply increase the Dyntopo detail level (or zoom in, if using Screen mode) and use a tool like Crease or a custom alpha.

The SouthernGFX video shows exactly this process on a character sculpt.

2. The "Paint Resolution" Trick

Sometimes you know you'll need high detail in a specific area (like the face) but want to keep the rest of the model low-poly. Instead of subdividing the whole head, you can "paint" resolution just where you need it. This is a fantastic pro-tip from the Nomad community.

3. Protecting Areas with Masks

What if you want to add detail near a sensitive area, like an eyelid, without accidentally altering its shape? You can use a mask to protect it. Dyntopo will not alter the topology of masked areas. This gives you precise control over its effects.

When to Use Dyntopo vs. Other Methods

Dyntopo is powerful, but it's not the only tool for managing topology. A professional workflow involves knowing when to use each method.

• Use Dynamic Topology for:

  • The initial, free-form block-out and concepting phase.
  • Adding localized surface details without increasing the polycount of the entire model.
  • Quickly fixing stretched polygons in a specific area without doing a full remesh.

• Use Voxel Remesher for:

  • Combining multiple, separate objects into a single, continuous mesh.
  • When you need a completely new, clean, and uniform topology across the entire object after making major form changes.

• Use Multiresolution for:

  • Working non-destructively on a model with a clean base topology.
  • Posing. As we learned in the last lesson, you can drop to the lowest subdivision level for smooth deformations, then go back to the highest level to see your details on the new pose.
  • Baking details for use in other applications (a more advanced topic).

Dyntopo creates a mesh of triangles that can look messy, while Voxel Remeshing and Subdivision maintain a cleaner structure of quads. For the free-form stage, Dyntopo is king. Once you are happy with the overall form, you might do a final Voxel Remesh to clean up the topology before moving to Multiresolution for final detailing and posing.

Conclusion

You have now completed the first module and are equipped with a powerful set of professional sculpting techniques. By understanding how to manage mesh resolution with Dynamic Topology, you can sculpt faster, more freely, and more efficiently on your mobile device. This is a cornerstone of a productive workflow, enabling you to bring your ideas to life quickly, whether for a client commission or for a product in your online store.

Key takeaways from this lesson:

• The Problem: High-resolution is needed for detail, but low-resolution is needed for performance and posing.
• The Solution: Dynamic Topology (Dyntopo) adaptively adds or removes polygons under your brush, giving you detail only where you need it.
• Efficient Workflow: Dyntopo eliminates the need for constant manual remeshing, allowing for a more fluid and creative sculpting process.
• Control is Key: You can control Dyntopo's behavior using the Detail (Screen, Radius, Constant) and Method (Uniformisation, Subdivision, Decimation) settings.
• The Right Tool for the Job: Dyntopo is ideal for free-form sculpting, while Voxel Remesher is for merging and creating uniform topology, and Multiresolution is for non-destructive detailing and posing.

In our next module, we will shift gears from pure sculpting technique to the creative process. The next lesson, "Generate compelling 2D character or prop concepts using AI image generators," will show you how to leverage AI to create unique reference images that will serve as the blueprint for your next great sculpt.