Справка Houdini на русском Nodes Object nodes

Sound object node

The Sound object defines a sound emission point for the Spatial Audio chop.

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Introduction

The Sound object defines a sound emission point for the Spatial Audio chop. Multiple sound sources can be mixed by one Spatial Audio chop to create stereo or surround sound, with special effects like the doppler effect, volume loss over distance, obstacle interference, atmospheric filtering and positional audio.

To setup a Spatial Audio scene, one or more Sound objects should be used to emit sound. At least one microphone is needed to capture the sound. A SpatialAudio chop is needed to render the sound. If any obstacles or filters are used, at least one Acoustic chop is needed to design the spectrum filter.

Moving Sound and Microphone objects around will produce variations in pitch and volume, especially if either object is directional. Setting up a directional microphone or sound object is much like setting up a directional light.

Parameters

Transform

Transform Order

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.

Translate

Translation along XYZ axes.

Rotate

Degrees rotation about XYZ axes.

Scale

Non-uniform scaling about XYZ axes.

Pivot

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

Uniform Scale

Scale the object uniformly along all three axes.

Modify Pre-Transform

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.

Clean Transform

This reverts the translate, rotate, scale parameters to their default values while maintaining the same overall transform.

Clean Translates

This sets the translate parameter to (0, 0, 0) while maintaining the same overall transform.

Clean Rotates

This sets the rotate parameter to (0, 0, 0) while maintaining the same overall transform.

Clean Scales

This sets the scale parameter to (1, 1, 1) while maintaining the same overall transform.

Extract Pre-transform

This removes the pre-transform by setting the translate, rotate, and scale parameters in order to maintain the same overall transform. Note that if there were shears in the pre-transform, it can not be completely removed.

Reset Pre-transform

This completely removes the pre-transform without changing any parameters. This will change the overall transform of the object if there are any non-default values in the translate, rotate, and scale parameters.

Keep Position When Parenting

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

Child Compensation

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

Enable Constraints

Enable Constraints Network on the object.

Constraints

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

Tip

You can you use the Constraints drop down button to activate one of the Constraints Shelf Tool. If you do so, the first pick session is filled automatically by nodes selected in the parameter panel.

Note

Lookat and Follow Path parameters on object nodes are deprecated in favor of Look At and Follow Path constraints. The parameters are only hidden for now and you can set their visibitily if you do edit the node’s parameter interface.

Sound

Sound Active

Turns the sound source on (if greater than zero) or off.

Volume

The volume of the sound source.

Directional

If off, the sound source is non-directional and emits sound equally in all directions. Otherwise, the sound source is directional and pointed down the negative Z axis. The emission cone and outer cone parameters determine the field of emission. Any sound emitted from within the emission cone have a gain defined by the volume (above). Any sound emitted outside the outer cone have a gain defined by the outer volume parameter (below). Any sound emitted between the recording cone and the outer cone have a gain that is interpolated between the two volumes.

Emission Cone

Defines the angle of the emission cone, measured from the Z axis to the edge of the cone. Setting this to 180 degrees will make a non-directional sound source.

Outer Cone

Defines the dropoff region from the emission cone to the outer cone. If the emission cone is set to 60 degrees and the outer cone is set to 20 degrees, any sounds emitted from more than 80 degrees off the Z axis will fall outside the outer cone.

Dropoff

Sets the interpolation type for the dropoff from the emission cone volume to the outer volume.

Dropoff Rate

Increases or decreases the rate of dropoff.

Outer Volume

The gain that is applied to any sounds coming from outside the outer cone.

Source CHOP

Specifies the CHOP that contains the audio that this Sound object is emitted. Only one audio track can be emitted; if there is more than one audio track in the CHOP, the first one is used.

Misc

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

Object nodes

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