The left menu chooses the order in which transforms are applied (for example, scale, then rotate, then translate). This can change the position and orientation of the object, in the same way that going a block and turning east takes you to a different place than turning east and then going a block.

The right menu chooses the order in which to rotate around the X, Y, and Z axes. Certain orders can make character joint transforms easier to use, depending on the character.

Translation along XYZ axes.

Degrees rotation about XYZ axes.

Local origin of the object. See also setting the pivot point .

This menu contains options for manipulating the pre-transform values. The pre-transform is an internal transform that is applied prior to the regular transform parameters. This allows you to change the frame of reference for the translate, rotate, scale parameter values below without changing the overall transform.

When the object is re-parented, maintain its current world position by changing the object’s transform parameters.

When the object is being transformed, maintain the current world transforms of its children by changing their transform parameters.

Enable Constraints Network on the object.

Path to a CHOP Constraints Network. See also creating constraints.

Controls the distance to the ZPS plane measured from the camera.

The ZPS is a set of points in space whose left and right projections overlap at the same spot in the displayed image. The ZPS plane coincides with the viewing screen. Objects between the camera and the ZPS plane appear to the viewer in front of the viewing screen, and objects behind the ZPS plane appear to the viewer behind the viewing screen.

If this checkbox is turned on, the ZPS value is treated as if it is infinity. The points at infinity will appear to lie on the screen, and all other ones will appear between the viewer and the screen. This is equivalent of making the optical axes of the left and right cameras parallel.

Controls the separation distance between the left and right cameras and is directly visualized as part of the camera prop in the viewport. Increasing this parameter will push both Left and Right camera away from the center.

The Interaxial Distance is the separation between the left and right cameras. Large values produce a more pronounced stereoscopic effect with enhanced sense of depth, while small values reduce the sense of depth. A value of zero produces non-stereoscopic imagery.

Allows you to fine tune the left and right camera lenses. These parameters contribute to the overall Interaxial Distance for the stereo camera.

Displays the arrows near the camera lenses. Selecting and moving these objects increases or decreases the interaxial distance of the stereo camera. However, you will not see the interaxial controls if you are looking through the camera. To view and move the controls in the viewport, unlock the camera and switch to the object level. The controls act like Null objects.

Turning on this checkbox will enter the camera into a 'toe-in' mode, where the additional rotation of Left/Right sub-cameras is allowed. In this mode, it is not possible to visualize the ZPS plane, because it is no longer a planar. It becomes a curved surface.

Determine the sub-camera horizontal rotations.

Determines the pivot point around which the cameras rotate.

Displays the toe-in manipulators near for the camera in the viewport. You can select the arrows to position the pivot, and the rotator to adjust the rotation angle for each camera.

Displays a frame corresponding to the physical screen when viewing the stereo images.

Screen surround is the left, right, top, and bottom edges of the viewing screen. This visualization helps position the objects in the scene relatively to the camera and the screen surround. Objects between the camera and screen surround visualization will appear to pop out of the screen towards the viewer.

Displays several frustums.

Displays the frustum as translucent polygons rather than the wireframe outline. This is convenient for estimating which objects are inside or outside the frustum, and which objects partially cross the boundary.

Allows the adjustment of the frustum transparency.

Scales the viewport geometry. This parameter is only for display purposes.

The output resolution in pixels. Standard presets are available via the pull down menu to the right of the parameter.

The pixel aspect ratio of the output image.

Camera focal length (zoom).

The units used for the focal length.

Width of the visible field.

Position of near clipping plane.

Position of far clipping plane.

Define the center of the window during the rendering process.

Scale for expanding the cropped area specified by the Crop parameters.

Defines the cropping area in terms of the camera’s viewing area margins.

The portion of the frame interval that the camera shutter is open. Used to determine motion blur. [0,1]

The lens focal distance and distance from the camera at which objects will be in focus. This is only used when rendering using depth of field. Objects outside this distance will be blurred.

Lens fstop. This is only used when rendering using depth of field. Determines blurriness of depth of field effects.

Filter kernel used in depth of field rendering.

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

The object inside the subnet from which to get the subnet’s output transform.

Space separated list of objects inside the subnet to display. Use * to make all objects visible (the default). You can use wildcards and bundle references to specify objects.

This parameter lets you:

• Quickly filter the visible objects based on an existing naming convention, for example *_proxy.

• Control visibility of objects inside a locked digital assets where the display flags are not available.

Otherwise, in a normal subnet you can simply go into the subnet and set the display flag on objects.

Object is capable of being picked in viewport.

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

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 the OBJ Caching section of the Houdini Preferences window for how to control the size of the object transform cache.