Retopology in Blender: what it is and how to retopologize a sculpt, step by step

A sculpt or a 3D scan gives you the shape, rarely a mesh you can rig or unwrap. This guide covers manual retopology in Blender, the automatic options and how to carry the detail over. Menu names match Blender 5.2, checked against the manual and the source code.

What is retopology?

Retopology is building a new mesh over an existing model with clean topology: mostly quads, laid out in edge loops that follow the forms. The original, the high poly, stays as a reference; the new mesh is the low poly.

• Animation. The Blender manual says a mesh that will deform, such as an animated character, needs topology that follows the flow of the geometry, and that no perfect automatic tool exists for this yet. The rigging guide covers what comes next.
• UVs and texturing. Seams along clean loops give tidy UV islands, and a light mesh is far easier to unwrap and paint than a dense sculpt.
• Real time and rendering. Game engines take the light mesh plus baked maps, and in a render it costs less memory than the sculpt it replaces.

How to retopologize in Blender, step by step

The manual sums up the method: create a new mesh that overlaps the original, then adjust it until it covers the original and matches its shape, with the Retopology overlay, the Poly Build tool and Snapping.

1. Add the new mesh

1. In Object Mode, put the 3D cursor on the sculpt's plane of symmetry. For a model centered on the world origin, Shift+C resets the cursor to the origin and frames the scene.
2. Add > Mesh > Plane (Shift+A). The Mirror modifier will mirror across its origin, so leave the origin on that plane.
3. Press Tab for Edit Mode. The plane is your first quad: once snapping is on, move its vertices onto the sculpt and build outward.

2. Turn on the Retopology overlay

In Edit Mode, a second overlay button appears next to Viewport Overlays in the 3D Viewport header. Open it, and under Shading tick the box next to Retopology. The overlay hides the solid surface of the mesh you are editing and draws it toward the view, so you see the sculpt through your mesh without the clutter X-Ray shows from the back side. The number in the field is the Offset, how far the edited mesh is drawn toward the camera; raise it when parts of your mesh sink into the sculpt. The overlay arrived in Blender 3.6, replacing the Hidden Wire option that older tutorials use.

3. Set up snapping to the sculpt surface

Snapping makes new and moved vertices stick to the sculpt. Toggle it with the magnet icon in the 3D Viewport header or Shift+Tab, or hold Ctrl during a move. The popover next to the magnet holds three lists, named Snap Base, Snap Target and Snap Target for Individual Elements since Blender 4.2. Blender 4.0 and 4.1 called them Snap With, Snap To and Snap Individual Elements To, and in Blender 3.6 Face Project sat directly in the Snap To list, as many older tutorials show.

Under Target Selection, keep Include Non-Edited on: it lets you snap to the sculpt, which is not in Edit Mode. Turn Include Active off so vertices do not snap to your own new mesh. If you made the sculpt unselectable, leave Exclude Non-Selectable off (its default), or snapping ignores it. Backface Culling keeps vertices off faces that point away from you.

4. Build faces with Poly Build

Poly Build, in the Edit Mode toolbar, combines the moves you repeat most in retopology:

• Ctrl+click adds a vertex at the mouse cursor and builds a triangle with the nearest edge. With Create Quads on in the tool settings, the next triangle that shares an edge turns the pair into a quad.
• Click and drag a vertex to move it; click and drag an edge to extrude it into a quad.
• Shift+click dissolves the vertex or deletes the face under the cursor, highlighted in red.

The manual suggests turning on Auto Merge (Sidebar, Tool tab, Options) with snapping, so a vertex dropped on another merges with it. E (extrude) and F (make an edge or a face) still work.

5. Add Mirror and Shrinkwrap modifiers

Most characters are symmetrical, so build one half. Add a Mirror modifier (Add Modifier > Generate > Mirror): by default it mirrors along the object's local X axis, across its origin. Enable Clipping so vertices on the middle cannot cross the mirror plane. Merge, on by default, welds them to their mirrored copies within the Merge Distance.

Below it, add a Shrinkwrap modifier (Add Modifier > Deform > Shrinkwrap) and set Target to the sculpt. Its default Wrap Method, Nearest Surface Point, moves every vertex to the closest point of the target, so the mirrored half lands on the sculpt too. A small Offset with Snap Mode set to Outside Surface keeps the mesh just above it. Keep the modifier's Edit Mode display on to see the wrapped result as you work.

Edge flow: joints, eyes and mouth

The manual describes good edge flow for organic models: loops follow the natural contours and deformation lines of the skin and the muscles beneath, and they are denser where the character deforms more, for example at the shoulders or knees. Retopology artists usually apply it this way:

• Joints: give shoulders, elbows, knees, wrists and fingers several loops across the bend, so the mesh has edges to fold along.
• Eyes and mouth: circle each opening with concentric loops that follow the ring-shaped muscles around it, so lids and lips can open and close, then tie these rings to the nose and cheeks.
• Poles, vertices where three, five or more edges meet, stop edge loops. A character mesh cannot do without them, but you can put them where the mesh barely deforms, away from the corners of the mouth and eyes and from the bend of a joint.
• Quads of even size: keep triangles and n-gons out of areas that deform, and watch the face count with the Statistics option in Viewport Overlays.

Automatic retopology in Blender

Blender has no one-click retopology for meshes that deform. The automatic tools still suit props, scans and anything rigid; their settings are in the Blender remesh guide.

• Remesh, Voxel mode rebuilds the mesh on a 3D grid: uniform and closed, good for cleanup or a 3D print, and advised against by the manual for topology that will deform.
• Remesh, Quad mode uses QuadriFlow and outputs only quads, a good base for Subdivision Surface or Multiresolution, but the manual does not recommend it as final topology for a deforming mesh.
• Decimate (Add Modifier > Generate > Decimate) lowers the face count of a mesh that is otherwise fine, which the manual prefers to remeshing for that job. Collapse keeps a Ratio of faces, counted in triangles, and leaves triangles where it merges vertices; Un-Subdivide and Planar suit grid-like and flat meshes.
• Add-ons. Quad Remesher, a paid add-on by Exoside, the free QRemeshify extension and the standalone Instant Meshes produce quad meshes automatically. RetopoFlow, by Orange Turbine and sold on Superhive (formerly Blender Market), speeds up manual work instead: Contours wraps loops around arms and fingers, PolyStrips sketches strips of quads, Strokes and PolyPen fill and refine. Version 4 runs inside Edit Mode, its listing gives Blender 4.2 to 5.2, and its code is under the GPL.

Transfer the detail from the sculpt

The fine detail of the sculpt comes back through a baked map or a Multiresolution modifier. Either way, the retopologized mesh needs UVs before you bake: see the UV unwrapping guide.

Bake a normal map from the high poly

1. Set the render engine to Cycles. In the low poly's material, add an Image Texture node with a new image, set its Color Space to Non-Color, and leave it unconnected but selected.
2. Click the sculpt, then Shift+click the low poly so it is the active object.
3. In Render Properties > Bake, set Bake Type to Normal, enable Selected to Active and click Bake. Raise Extrusion or Max Ray Distance where the sculpt sticks out of the low poly, or enable Cage for more control.
4. Save the image from the Image Editor (Image > Save As), then plug it into a Normal Map node.

The normal map guide covers each setting and the usual errors; the texture baking guide covers the other maps.

Keep sculpting with the Multiresolution modifier

To keep sculpting on the clean topology, project the sculpt into a Multiresolution modifier:

1. Apply the Mirror modifier (hover over it, Ctrl+A): no Generate modifier can sit above a Multiresolution. Apply or remove the retopology Shrinkwrap as well.
2. Add Generate > Multiresolution and click Subdivide a few times, one level per click.
3. Add a Shrinkwrap below it, targeting the sculpt. The Multiresolution page of the manual recommends Wrap Method Project, Snap Mode Above Surface and Negative enabled for this; with no axis ticked, Project follows the normals.
4. Apply the Shrinkwrap. A deform modifier placed after a Multiresolution acts on its levels, and applying it writes the result into them: the detail now lives in the modifier, ready for Sculpt Mode.
5. To bake, set Levels Viewport to 0 and Render to the highest sculpted level, tick Bake from Multires in the Cycles Bake panel and set Bake Type to Normals (Displacement and, since Blender 5.0, Vector Displacement are the other types). The object still needs UVs and a selected Image Texture node.

Polygon count and render time

Cycles renders each mesh after its modifiers, so the face count that matters includes the Render levels of Subdivision Surface and Multiresolution. Dense geometry costs memory first: the manual warns that more subdivision levels mean more vertices and more memory, in system RAM and video memory, and that Blender can hang or crash when it runs out. On the GPU, with CUDA, OptiX, HIP and Metal, Blender tries to use system memory when the card is full, at a performance cost; when the scene still does not fit, the render fails with an Out of memory error.

A retopologized mesh with a normal map is the light side of that trade: the manual describes baked maps as reproducing fine surface detail without the performance cost of dense geometry. A normal map does not change the silhouette, though, so keep enough polygons wherever the outline shows.

Common retopology problems

• Vertices jump to the back of the model: enable Backface Culling, or use Face Project rather than Face Nearest, which can reach hidden geometry.
• The new mesh disappears inside the sculpt: raise the Retopology overlay Offset, or give the Shrinkwrap a small Offset with Snap Mode set to Outside Surface.
• Vertices behind the sculpt cannot be selected: that is the Retopology overlay at work; toggle X-Ray with Alt+Z.