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The Edit SOP allows you to transform or sculpt faces/edges/points on a curve/surface interactively.
Unlike most Houdini operators, Edit is cumulative. You can perform multiple edit operations (on multiple selections) in a single Edit node. An Edit node stores the final result of all the edits you perform in that node.
You can only use Edit interactively in the viewer.
Keep the parameters for the Edit SOP visible in a parameter editor pane as you use the tool in the viewer pane. The parameters contain controls that modify the behavior of the tool in the viewer.
In edit mode, the parameters affect the current selection. When you select new points/faces, the parameters reset. In sculpt mode, the parameters affect future strokes.
Before you try to select points, turn on the Points icon in the viewer pane’s display options toolbar (on the right side of the viewer). (If the display options toolbar is not visible, click the stowbar on the right side of the viewer pane to show it.)
Transform points and/or faces
Move points and faces along their normals
Push, pull, or smooth points by brushing over them
Press while working in the viewer to get a menu of tool options. For example, you can assign different functions to the mouse buttons.
Use the soft radius options to do proportional modification of the surrounding points as you transform.
Edit has an optional second input for reference geometry. When the second input is connected, the Edit node transforms your edits relative to the differences between the geometry to edit and the reference geometry.
You can use the details pane to edit the position of each point or vertex in a piece of geometry.
Only committed edits are affected by reference geometry. Press the Commit Transform/Peak Changes button to commit an edit. The current edit is automatically committed when starting a new edit or performing a sculpt operation.
The group to apply the edits to. If this is blank, the edits apply to all geometry in the first input. You can create a group and use this parameter to mask the edits so they only apply to the points or faces in the group.
The type of geometry to use in the group. If the group has only one type of geometry (for example, points), you can just use "Guess from group" and Houdini will figure out the geometry type from the contents of the group.
See the online help for the Transform SOP for information on the parameters on this tab.
Preserve Normal Length
Preserve normal lengths when recomputing point normals (when Recompute point normals is on).
The transform parameters are interpreted relative to this transform space.
The group is transformed relative to the global space.
The group is transformed relative to a single local space determined from the group.
Local Per Island
Each connected island in the group is transformed relative to its own local space.
The method for determining a local frame from a collection of components.
The local space origin is the center of the bounding box and the local space orientation is the average of the individual orientations of each component.
The local space origin is the center of the bounding box and the local space orientation is determined by the average normal and a world space Up Vector.
Oriented Bounding Box
An oriented bounding box is computed with the local space origin and orientation being determined by that oriented bounding box.
If the Transform Space is Normal+Vector, then the second degree of freedom may be specified via this parameter. The local y-axis will be rotated to match the specified up vector as closely as possible.
Slide on Surface
Constrain edits to the existing surface, so points and edges will seem to "slide" across the existing surface when you move them.
See the online help for the Peak SOP for information on the parameters on this tab.
Method for measuring which points are within the soft radius.
The shortest distance to a point in the group following a path along edges.
The shortest distance to a point in the group following a path along the surface.
The 3D distance to the closest point in the group.
Radius with Connectivity (deprecated)
The 3D distance to the closest point in the group, as long as there is a connected path contained entirely within the Soft Radius.
Lead Point Attribute is used to determine which normal each point should follow if in Peak mode, and Distance Attribute determines how much each point is affected. Only points in the input group will be affected, even if other points have valid values in the attribute.
Distance within which other points/faces follow the points/faces you edit directly.
If Distance Metric is Attribute, apply a rolloff to the distance output by treating the Distance Attribute as raw distances. A value of zero will be fully transformed, while higher values will be transformed less. Only points whose values are less than or equal to Soft Radius will be affected. Otherwise the value is treated as if it has already been rolled off, and the transform is multiplied by the value. A value of one will be fully transformed while smaller values will be transformed less.
If Distance Metric is Attribute, this specifies the point attribute containing the values that modify the amount each point in the group is transformed by. If Apply Rolloff is true the values are treated as raw distances and will be rolled off to between zero and one, otherwise the transform amount is multiplied by the value.
Lead Point Attribute
If Distance Metric is Attribute and Translate Along Lead Normal is true, this specifies the point attribute containing the point index of the whose normal should be translated along. A value of -1 will cause the point to be translated along its own normal.
The type of rolloff for soft modifications. This affects how much influence your direct edits have on other points/faces with the soft radius, based on their distance.
Linear falloff: the amount of influence decreases linearly with distance.
Slow falloff: direct edits affect distant points/faces more than with Cubic.
Quick falloff: direct edits affect distant points/faces less than with Quadratic.
Calculate falloff according with the metaball density function you specify in the Kernel function parameter.
Angles of the cubic rolloff function’s tangents. The first value applies to the tangent farthest from the source point, the second applies to the tangent closest to the source point.
Density function to use when Soft type is Metaball.
When to output the soft radius falloff as a
Never create or write to the
Always create and write to the
When Viewport Tool Is Active
Only create or write to the
vis_falloff attribute temporarily
when the viewport tool for this node is active.
See the online help for the Sculpt SOP for information on the brush parameters.
Use Orient Attribute
If set, all edits are applied relative to the orientation described by a quaternion point attribute named "orient". This is most useful when the orient attribute is animated for use with the Wire Solver DOP.
If set, all operations will be reflected along the plane of symmetry.
This defines the normal of the plane of symmetry for reflection.
This defines the origin of the plane of symmetry for reflection.
This is the distance of the plane of symmetry from the origin of symmetry.
This is the maximum distance from a points mirrored position to search for the mirrored point.
This is the tolerance used to determine if a point lies directly on the plane of symmetry. The soft falloff from any points not directly on the plane will be clamped at the plane of symmetry.
Recompute Point Normals
Recomputes point normals if they exist.
Commit Transform/Peak Changes
Saves the current edit and resets the parameters to start a new edit.
Reset All Changes
Restores geometry to initial state.
Geometry to edit
The geometry to apply the edits to.
(Optional) When this input is connected, all edits take place relative to the difference between the geometry to edit and this geometry.
This example creates an animation illustrating how the Edit SOP’s Reference Geometry input can be used to apply an edit on animated geometry.