Houdini 13.0 Nodes Surface nodes

Lets you paint capture attributes directly onto geometry.

Capture Layer Paint is a specialized paint operation for painting capture attributes.

Using Paint Capture Layer

  1. Click the Paint Capture Layer tool on the Character tab.

  2. Select the geometry to paint and press Enter to confirm your selection.

  3. Click MMB the bone to select the capture region.

  4. Drag the brush over the surface to paint it.


You can modify the Radius and Opacity on the operations toolbar.


Capture Type

The type of capture (the attribute) to modify.


Modify the boneCapture point attribute when painting.


Modify the metaCapture point attribute when painting.



Specifies a subset of points to affect. If this is blank, all points are affected.

Group Type

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.


The operation used by Apply To All.

Default Skeleton Root Path

Default prefix applied to capture region paths if none is supplied by the geometry.

Capture Region

The capture region to paint.

Maximum Paint Value

The maximum value of a capture weight that can be reached in the layer using the paint operation.

Minimum Reduce Value

The minimum value of a capture weight that can be reached in the layer using the reduce operation.

Apply To All

Applies the operation to all of the selected geometry.

Reset All Changes

Restores the geometry to its initial state.

Flatten Layers

Updates the layer to contain a snapshot of the current capture weights.

Visualize Attribute

Whether to visualize the capture weights by coloring the geometry.

Visualize Normalized Weights

Indicates the visualized weight values should be normalized.

Visualize Layer

Whether to visualize the weights in the layer or the result after compositing.


Whether to visualize weights for the selected capture region or all capture regions.

Visualize Mode

For single bone, how to map the weight to a color.



The basic shape of the brush: circle, square, or bitmap.


What bitmap to use. The alpha channel becomes the brush.


The radius of the brush when painting in the 3d viewport.

UV Radius

The radius of the brush when painting in the 2d viewport.

Radius Pressure

This controls how much effect the pressure of a stylus will have on the radius. A value of 1 means the radius will go from 0 to the amount in Radius. A value of 0 will mean the radius will always be constant, regardless of pressure. A value of 0.5 will mean the radius will be scaled between one half of Radius and Radius.


If set, this limits how far the brush will paint along its axis. This can be used if connectivity is disabled to limit the effect of the brush. The first parameter is how deep below the surface the brush should penetrate. The second is how high above the surface it should stop. These values can be negative.

Brush Angle

How far to rotate the brush.

Brush Squash

Amount to squash the brush in the y direction before rotation.


The amount to affect the stencil mask.

Opacity Pressure

This controls the how much effect the pressure of a stylus will have on the opacity. It obeys the same scaling as the Radius Pressure.

Brush Splatter

A random noise in the brush’s opacity based upon the position on the brush.

Paper Grain

A random noise on the object’s stencil mask based on the object position.

Soft Edge

Percentage of the brush to be rolled off.

Kernel Function

Which metaball kernel to use for the roll off.

Up Vector Type

How the brush should be oriented on the surface:

Stroke Direction

Oriented in the direction in which the brush moves.


Oriented as specified in the Up Vector field.

Up Vector

The fixed up vector to orient brush to.



If set, the brush will perform reflective symmetry. Any strokes will be mirrored along the plane of symmetry.


If set, the brush will perform rotational symmetry. Any strokes will be rotated around the axis of symmetry.


This defines the normal of the plane of symmetry for reflection and the axis of symmetry for rotation.


This defines the origin of the plane of symmetry for reflection and the origin of the axis of symmetry for rotation.

Number of Rotate

This defines the degree of rotational symmetry. A degree of 3 means the stroke will be applied 3 times at 120 degree separation. A value of 5 will perform the stroke 5 times with 72 degrees of separation.

Reflection Dist

This is the distance of the plane of symmetry from the origin of symmetry.

UV Reflection

If set, the brush will reflect when brushing is done in the UV viewport.

UV Origin

The origin of the line of reflection in the UV viewport.

UV Angle

The angle of the line of reflection in the UV viewport. 0 will mirror about the U axis, 90 will mirror about the V axis.


Orient Brush to Surface

Switches between the brush being perpendicular to the surface or always oriented along the view direction. If you are having trouble with a shaky brush, try turning this off.

Use Connectivity

If set, the tool will only affect points connected to the closest point to the intersection. This is usually a good thing, as it avoids accidentally painting through the geometry (but see the depth parameter), but can prevent smoothly painting across seams.

Realtime Mode

Set this to paint geometry as it’s deforming.


The current direction of the brush. If orient to surface is on, this is the normal direction of the surface hit by the brush. Otherwise, it is the direction from the eye to the surface.

Hit Location

The current location of the brush. This tracks the surface as the brush moves along it.

Hit Primitive

The primitive number of the primitive the current brush is centered at.

Hit UV

The location the current brush is on the current primitive. Note this is a parametric UV location, not the texture UV location.

Hit Pressure

The amount of force the brush is currently applying. This is only meaningful when a tablet interface that supports pressure is used.

Hit Point

The point closest to the current brush’s center.


Controls the current state of the brush. When it is on No-op, the values of the stroke tab are ignored and no updating of the geometry is done. Other values are set automatically as you brush the surface, allowing the SOP to update in response to your actions.