Rhino QuadRemesh Guide: Create Cleaner Quad Meshes and SubD

What will you learn in this guide?

Rhino’s QuadRemesh command is used to generate a manageable quad mesh from existing surface, mesh, or SubD geometry. In this guide, we’ll compare two main targeting approaches, look at how you can affect face density in curved areas, and see when to use guide curves. Then we’ll cover hard-edge detection and symmetry options, before walking through the steps to optionally convert the resulting mesh to SubD.

A quad mesh is a geometry layout that can be used for modeling, rendering, animation, and reverse engineering. However, no single setting produces the best result for every model. The goal is to choose settings based on the model’s size and the details that need to be preserved, check the preview, and prepare the result for the next stage of your workflow.

Requirements

This guide is based on McNeel’s Rhino 8 help documentation for QuadRemesh and ToSubD. Before you begin, you’ll need a model to edit in Rhino 8 and geometry in a type accepted by QuadRemesh: a surface, mesh, or SubD. The documented input types for ToSubD are mesh, extrusion, surface, and sub-surface.

The command documentation does not specify an account or online service requirement. Accordingly, this guide does not assume that a subscription or internet connection is required. Before running QuadRemesh, it’s useful to identify which parts of the model need to retain their shape and where a simpler surface layout is more important. The command’s preview lets you inspect the result as you change settings.

Create a mesh with QuadRemesh

1. Choose the input and target. Start the QuadRemesh command and select a surface, mesh, or SubD object. First decide what matters most in the output: approximate edge length, or approximate quad/face count? Target edge length depends on model scale; the same value can be expected to produce different face counts on objects of different sizes. If the value is set too high relative to the object’s size, remeshing may fail.

2. Choose between target edge length and target quad count. Use the Target Edge Length option if you want a consistent edge length relative to the model’s physical or scene scale. This option sets an approximate value, and the number of faces in the result increases as the scale grows. If getting close to a specific face count is the priority, use Target Quad Count as your target. This approach is scale-independent: the goal is to produce a similar face count when the same input is at different scales. Both settings are approximate targets, so check the result in the preview.

3. Adjust detail distribution with Adaptive Size. When Adaptive Size is 0, the aim is to produce fewer quads of similar size. Increasing the value can create smaller quads in areas of high curvature; 100 is intended to preserve more detail. According to the documentation, values above 30 can reduce control over achieving fewer quads. Decide how to balance denser detail against a lower face count, and adjust the value based on the result.

4. Assess face shape and density in the preview. QuadRemesh options can produce different results, such as keeping faces as square as possible or varying their width and height; they can also keep face sizes similar or allow them to vary. Likewise, face density can remain generally uniform or increase in detailed areas. No single set of options is best for every model. Open the preview and check how the faces relate to curves, boundaries, and shapes that need to be preserved. The preview also provides information about average edge length and face count.

5. Add guide curves if needed. You can use guide curves to influence the direction of quads in a specific area or define the path followed by edge loops. The curves must be projected onto the input geometry; otherwise, they have no effect. Curve Influence options offer different strengths: Approximate has a weak effect on overall flow, Create Edge Ring directs intersecting edges perpendicular to the curves, and Create Edge Loop places edge loops along the curves. The latter two options have a stronger effect, but edge rings may not follow the curves exactly.

6. Check symmetry and hard edges. For a symmetrical object, you can choose to remesh symmetrically along the X, Y, or Z axes relative to the center plane of the object’s bounding box. You can use multiple axes; the option is only meaningful if the model is actually symmetrical and the correct plane is selected. When Detect Hard Edges is on, a hard-edge loop is added if the angle between adjacent faces is greater than 30 degrees. If the input mesh is irregular, unwanted hard edges may be created, so you may need to turn this option off.

7. Review surface boundary and input-preservation settings. Use Surface Edges controls whether mesh edges are created at subsurface boundaries, and applies only to polysurface or extrusion inputs. Off ignores these boundaries; Smart preserves them except when they are considered meaningless and is generally described in the documentation as the best choice; Strict preserves all subsurface boundaries. Also use the Delete Input option to decide whether the input object is deleted when the operation finishes. Keeping the source geometry until you are satisfied with the output is the more cautious approach.

Convert the mesh to SubD

If you want to turn the QuadRemesh result into a smooth, curved SubD surface, you can use the Convert to SubD option. Hard edges are preserved where possible. SubD Creases can transfer detected hard edges created on the mesh to SubD creases; SubD corners can turn corner points into SubD corners.

The Interpolate SubD setting also affects the shape of the result. When enabled, quad mesh vertices are used as SubD points and the SubD stays on the mesh; the documentation describes this method as generally used for reverse engineering. When disabled, mesh vertices are treated as control polygon points; the result may be slightly smaller or larger than the input shape. These options correspond to the relevant settings in the ToSubD command.

You can also use the ToSubD command for a separate conversion after QuadRemesh. This command supports mesh, extrusion, surface, and sub-surface inputs. Note that surface trims may be lost in the SubD, and that subsurfaces within a polysurface are converted individually. The documentation also states that non-manifold mesh edges and their associated faces will be removed.

Common mistakes and next steps

• Setting the target edge length too high: A value that is too high for the object’s size can cause remeshing to fail. Reassess the target and preview.

• Ignoring model scale: Edge length depends on scale, while the quad count target is scale-independent. Choose the option that suits your needs.

• Not projecting a guide curve onto the geometry: The curves must be projected onto the input object to have an effect.

• Enabling symmetry on the wrong plane: Use it only for symmetrical geometry and with the correct center plane.

• Leaving hard edges unchecked: The 30-degree threshold may create edge loops you don’t want on irregular inputs. If needed, turn off detection and compare the results.

After the first attempt, assess the face count, density in curved areas, and boundary preservation. If the result doesn’t meet your target, change one thing at a time rather than adjusting every setting at once: start with the targeting method, then test Adaptive Size, guide curves, and edge options separately. If you plan to convert the result to SubD, check the shape after conversion and look for any loss of trims.

Impact on architecture and visualization workflows

In architectural modeling, interior design, and archviz workflows, QuadRemesh may be useful when existing geometry needs to be converted to a more manageable quad layout. It offers options for modelers who want to direct where density increases on curved forms or remesh symmetrical parts. However, the quality of the source geometry, face boundaries, and details that need to be preserved all affect the result; don’t assume the mesh will always be production-ready.

In a workflow, it’s important for the people editing the model to assess the target face count and face flow together. These help documents do not explain hardware requirements, pricing, or licensing terms, so no assumptions should be made about those topics. Before starting a project, check Rhino 8 compatibility, the model type you’re using, and the possibility of losing trims when converting to SubD.

Sources and license

This guide has been adapted into English from the options documented in McNeel’s QuadRemesh and ToSubD help documentation for Rhinoceros 8. Both sources are provided under a free license.

Sources: McNeel, “QuadRemesh” and “ToSubD” command documentation.