Transfer Mesh Data¶

Reference

Mode: Object Mode
Menu: Object ‣ Link/Transfer Data ‣ Transfer Mesh Data

The Data Transfer tool transfers several types of data from one mesh to another. Data types include vertex groups, UV maps, vertex colors, custom normals… Transfer works by generating a mapping between source mesh’s elements (vertices, edges, etc.) and destination ones, either on a one-to-one basis, or mapping several source elements to a single destination one by interpolated mapping.

Transfers data layer(s) from active to selected meshes.

Freeze Operator: Prevent changes to settings to re-run the operator. This is useful if you are editing several settings at once with heavy geometry.
Data Type: Which data to transfer.

Data types.¶
Create Data: Add data layers on destination meshes if needed.
Vertex Mapping: Method used to map source vertices to destination ones. Because the options change depending on the Data Type options are explained in Vertex Mapping below.

Vertex Mapping¶

Topology¶

The simplest option, expects both meshes to have identical number of elements, and match them by order (indices). Useful e.g. between meshes that were identical copies, and got deformed differently.

One-To-One Mappings¶

Those always select only one source element for each destination one, often based on shortest distance.

Vertices

Nearest Vertex: Uses source’s nearest vertex.
Nearest Edge Vertex: Uses source’s nearest vertex of source’s nearest edge.
Nearest Face Vertex: Uses source’s nearest vertex of source’s nearest face.

Edges

Nearest Vertices: Uses source’s edge which vertices are nearest from destination edge’s vertices.
Nearest Edge: Uses source’s nearest edge (using edge’s midpoints).
Nearest Face Edge: Uses source’s nearest edge of source’s nearest face (using edge’s midpoints).

Face Corners

A face corner is not a real element by itself, it’s some kind of split vertex attached to a specific face. Hence both vertex (location) and face (normal, …) aspects are used to match them together.

Nearest Corner and Best Matching Normal: Uses source’s corner having the most similar split normal with destination one, from those sharing the nearest source’s vertex.
Nearest Corner and Best Matching Face Normal: Uses source’s corner having the most similar face normal with destination one, from those sharing the nearest source’s vertex.
Nearest Corner of Nearest Face: Uses source’s nearest corner of source’s nearest face.

Faces

Nearest Face: Uses source’s nearest face.
Best Normal-Matching:: Uses source’s face which normal is most similar with destination one.

Interpolated Mappings¶

Those use several source elements for each destination one, interpolating their data during the transfer.

Vertices

Nearest Edge Interpolated: Uses nearest point on nearest source’s edge, interpolates data from both source edge’s vertices.
Nearest Face Interpolated: Uses nearest point on nearest source’s face, interpolates data from all that source face’s vertices.
Projected Face Interpolated: Uses point of face on source hit by projection of destination vertex along its own normal, interpolates data from all that source face’s vertices.

Edges

Projected Edge Interpolated: This is a sampling process. Several rays are cast from along the destination’s edge (interpolating both edge’s vertex normals), and if enough of them hit a source’s edge, all hit source edges’ data are interpolated into destination one.

Face Corners

A face corner is not a real element by itself, it’s some kind of split vertex attached to a specific face. Hence both vertex (location) and face (normal, …) aspects are used to match them together.

Nearest Face Interpolated: Uses nearest point of nearest source’s face, interpolates data from all that source face’s corners.
Projected Face Interpolated: Uses point of face on source hit by projection of destination corner along its own normal, interpolates data from all that source face’s corners.

Faces

Projected Face Interpolated: This is a sampling process. Several rays are cast from the whole destination’s face (along its own normal), and if enough of them hit a source’s face, all hit source faces’ data are interpolated into destination one.

Further Options¶

Auto Transform

Automatically computes the transformation to get the best possible match between source and destination meshes.

This allows to match and transfer data between two meshes with similar shape, but transformed differently. Note that you’ll get best results with exact copies of the same mesh. Otherwise, you’ll likely get better results if you ”visually” make them match in 3D space (and use Object Transform) instead.

Object Transform

Evaluate source and destination meshes in global space.

Only Neighbor Geometry

Source elements must be closer than given distance from destination one.

Max Distance: Maximum allowed distance between source and destination element (for non-topology mappings).

Ray Radius

The starting ray radius to use when Ray Casting against vertices or edges. When transferring data between meshes Blender performs a series of ray casts to generate mappings. Blender starts with a ray with the radius defined here, if that does not detect a hit then the radius is progressively increased until a positive hit or a limit is reached.

This property acts as an accuracy/performance control; using a lower ray radius will be more accurate however, might take longer if Blender has to progressively increase the limit. Lower values will work better for dense meshes with lots of detail while larger values are probably better suited for simple meshes.

Mix Mode

How to affect destination elements with source values.

All: Replaces everything in destination (note that Mix Factor is still used).
Above Threshold: Only replaces destination value if it is above given threshold Mix Factor. How that threshold is interpreted depends on data type, note that for Boolean values this option fakes a logical AND.
Below Threshold: Only replaces destination value if it is below given threshold Mix Factor. How that threshold is interpreted depends on data type, note that for Boolean values this option fakes a logical OR.
Mix, Add, Subtract, Multiply: Apply that operation, using mix factor to control how much of source or destination value to use. Only available for a few types (vertex groups, vertex colors).

Mix Factor

How much of the transferred data gets mixed into existing one (not supported by all data types).