Sticky object

Gets its transform from the surface of a polygonal mesh.

See also: Fetch

The Sticky Object gets its transform from the surface of a polygonal mesh. The mesh must also have texture coordinates that are used to determine the parameterization of the polygons.

Sticky Objects may be parented to other sticky objects. In this case they will parent their 2d UV transformation (both the UV offset and the rotation). If one parents sticky objects, the Fetch World Transform should be turned on.

The Sticky Geometry path determines the object to stick to. To stick objects to sticky geometry, you must parent the geometry you want stuck to the Sticky node.

For example to stick a sphere to a grid, make sure the grid has uv texture attributes, create a Sticky Object, set the Sticky Geometry to the grid, and parent the sphere to the Sticky Object.

Placing a sticky in the viewer

Click the Sticky tool on the Create tab.
Select the object to stick to and press Enter to confirm your selection.

You can shift-click the object to adjust the sticky location.

Note

Your object must have UVs for this tool to work properly.

Parameters

Sticky

Sticky Geometry	The SOP to stick the geometry to.
Attribute	The attribute name of the texture to use for the polygonal parameterization.
UV	The UV coordinates to evaluate the mesh at.
Rotation	The angle to rotate the local coordinate frame about the surface normal. It will only take effect when Orient to Surface is on. However, any other sticky objects parented to this one will inherit this rotation.
Orient To Surface	Whether the local orientation of the point should be used. The surface normal is used as the Z axis and the texture’s U axis is used as the Y axis.
Fetch World Transform	If this is set, the transform of the Sticky Geometry will be used. If not set, the parent transform of this node will be used.
Wrap in U/V	When not set, u and v values outside the range will be ignored. When it is set, they will be wrapped until they lie within the range.
U/V Range	This is the range of texture space to work within. Geometry whose texture coordinates lie outside this range will be ignored.
Assume UV Coordinates Unchanging	The sticky object builds a cache of the target surface’s texture coordinates. When this is set, the cache is kept even if the target’s geometry changes.
Clear UV Caches	The Sticky Object is conservative about rebuilding the UV information. This will force it to update the UV texture lookups.

Render

Display

Whether or not this object is displayed. Turn on the checkbox to have Houdini use this parameter, then set the value to 0 to hide the object, or 1 to show the object. If the checkbox is off, Houdini ignores the value.

Set Wireframe Color

Use the specified wireframe color

Wireframe Color

The display color of the object

Viewport Selecting Enabled

Object is capable of being picked in viewport.

Select Script

Script to run when the object is picked in the viewport. See select scripts .

Cache Object Transform

Caches object transforms once Houdini calculates them. This is especially useful for objects whose world space position is expensive to calculate (such as Sticky objects), and objects at the end of long parenting chains (such as Bones). This option is turned on by default for Sticky and Bone objects.

See OBJ cache preferences for how to control the size of the object transform cache.

Geometry Scale

Uniform scaling about the xyz axes.

Display

Whether to display only the icon, only the axis, or both.

Icon	Displays only the icon geometry.
Axis	Displays only the axis.
Icon and Axis	Displays both the icon and axis.

Control Type

Switches between the type of geometry to display.

Null	Displays null geometry (i.e. cross).
Circles	Displays circle primitives.
Box	Displays box primitive.
Planes	Displays plane primitives.
Null and Circles	Displays null and circle primitives.
Null and Box	Displays null and box primitives.
Null and Planes	Displays null and plane primitives.
Custom	If an input source is specified, this option will display the geometry of the input.

Orientation

Used in conjunction with circle or plane primitives. Determines which circles or planes to display.

All planes	Displays circle or plane primitives on the YZ, ZX and XY planes.
YZ plane	Displays a circle or plane primitive on the YZ plane.
ZX plane	Displays a circle or plane primitive on the ZX plane.
XY plane	Displays a circle or plane primitive on the XY plane.
YZ, ZX planes	Displays circle or plane primitives on the YZ and ZX planes.
YZ, XY planes	Displays circle or plane primitives on the YZ and XY planes.
ZX, XY planes	Displays circle or plane primitives on the ZX and XY planes.

Shaded Mode

Determines whether to display the primitives as shaded objects or as wireframe objects.

off	Displays primitives in wireframe mode.
on	Displays primitives in shaded mode.

Usages in other examples

Example name	Example for