AdnSoftWrap
AdnSoftWrap is a Houdini SOP that transfers deformations from one or more target geometries to an input geometry using a proximity-based influence model.
For every point of the deformed geometry, the deformer searches for nearby points belonging to the connected target geometries. All target points found within a user-defined radius are considered as potential influences, up to a maximum number of neighboring points. The resulting deformation is then computed from the contribution of those neighboring target points and applied to the affected point.
This deformer is particularly useful for transferring complex deformations between unrelated meshes, driving secondary geometry, or creating flexible deformation setups without requiring topological correspondence. It is also a core component of the AdnTransfer Tool, enabling the transfer of muscle and fat anatomy between character models.
How To Use
The AdnSoftWrap is easy to create and configure in Houdini. It requires the mesh to apply the deformation onto and the target(s) that will drive the deformation.
- Go to the geometry context of the rig containing the geometry to apply the deformer to.
- Press TAB and navigate to the submenu Adonis > Deformers to find the AdnSoftWrap
SOP type. - Create it and connect the geometry to the input.
- Go to the Targets tab in the AdnSoftWrap parameters, add a new entry to Targets to add a geometry target.
- Provide the object path of the target geometry in Target World Mesh.
Attributes
Settings
| Name | Type | Default | Animatable | Description |
|---|---|---|---|---|
| Radius | Float | 1.0 | ✗ | Defines the maximum distance used to search for influencing target points. Only target points located within this radius can contribute to the deformation of a given point. Larger values increase the area of influence and produce smoother results at the cost of performance. Has a range of [1, 10]. The upper limit is soft, higher values can be used. |
| Maximum Points | Integer | 100 | ✗ | Defines the maximum number of neighboring target points that can influence a point of the deformed geometry. Larger values will produce smoother results at the cost of performance. Has a range of [1, 10]. The upper limit is soft, higher values can be used. |
Time Attributes
| Name | Type | Default | Animatable | Description |
|---|---|---|---|---|
| Initialization Time | Time | Current frame | ✗ | Sets the frame at which the deformer will be initialized. |
Deformer Attributes
| Name | Type | Default | Animatable | Description |
|---|---|---|---|---|
| Envelope | Float | 1.0 | ✓ | Specifies the deformation scale factor. Has a range of [0.0, 1.0]. The upper and lower limits are soft, values can be set in a range of [-2.0, 2.0] |
Maps
| Name | Type | Default | Animatable | Description |
|---|---|---|---|---|
| Weights Attribute | float | 1.0 | ✗ | Specifies the name of the per-point attribute to read the weight of the deformation. The expected attribute name is adnWeights. The expected range of the per-component per-point values is [0.0, 1.0]. |
- All maps parameters are disabled in the Maps tab because the attribute names are fixed to drive specific functionalities of the solver.
- Fixed point attribute names also ensure compatibility with the API.
- To copy the map names of the disabled attributes for painting (using an attribute paint node) right click on the disabled map attribute parameter, press "Copy Parameter", select the attribute paint node and on the attribute name entry right click and press "Paste Values". This allows to easily copy the attribute name for painting.
- The Make Paintable utility provided in the Adonis menu > Utils, can be used to create the attribpaint node and automatically populate the entries with the map names of the AdnSoftWrap SOP.
- If a point attribute on the geostream does not match the naming convention exposed in the node, use an "Attribute Rename" node to rename the attribute to match the expected naming convention.
Parameter Template
Paintable Weights
| Name | Default | Description |
|---|---|---|
| Weights | 1.0 | Global weights map used to control the influence of the deformer at each vertex. |
To tweak the point attributes of an AdnSoftWrap SOP, an
attribpaintis needed. To ease the creation and initial configuration of this node, select the AdnSoftWrap SOP and click on Adonis > Utils > Make Paintable. This utility will create anattribcreatenode to define the required point attributes and assign their default values followed by anattribpaintnode to allow these attributes to be modified. Both nodes are automatically named and properly connected to the AdnSoftWrap node.
