Houdini 20.0 Nodes Geometry nodes

Time Blend 2.0 geometry node

Blends intraframe values for geometry.

This node type is deprecated. It is scheduled to be deleted in an upcoming revision of Houdini.

Use the Retime node instead.

(Since version 17.0.)

Since 16.5

The Time Blend SOP will cook its input at both the start and end of the closest integer frame. The values are then blended according to the fractional position within the frame.

Optionally, one can also specify that before a start or after an end frame, the first or last geometry should be held.

The Time Blend SOP can be used to change networks that only exist on whole frame steps into a network with proper intermediate results. This will only work if the topology of the geometry stays the same from frame to frame. It then allows for effects like multi-segment motion blur to correctly infer in between values. One such use is to turn a file sop that reads foo$F.bgeo into one that is defined smoothly over time.

Parameters

Hold First Frame

Determines if the first frame should be clamped. If so, any evaluations before this frame value will instead evaluate at this frame value.

Hold Last Frame

Determines if the last frame should be clamped. If so, any evaluations after this frame value will instead evaluate at this frame value.

Attributes

Float attributes matching this pattern will be blended.

Point ID Attribute

If this integer or string attribute exists, it will be used to find corresponding points in the different blend inputs. For example, using id will allow particle systems to find matching points even if particles are deleted. If it does not exist or is blank, point numbers will be used for the matching.

Primitive ID Attribute

If this integer or string attribute exists, it will be used to find corresponding primitives in the different blend inputs. For example, using name will allow fluid systems to find matching volumes even if volumes are reordered. If it does not exist or is blank, primitive numbers will be used for the matching.

Voxel Blend

When By Grid Index is selected, matching volumes will blend their data. This is not done by spatial position, but by absolute voxel index.

Smoothly Interpolate Normals, Quaternions, and Transforms

Enables use of spherical linear interpolation to blend attributes marked as normals, quaternions, and transforms, as well as any primitive transforms. If turned off, these types will be blended linearly.

Use Velocity When Interpolating Position

When enabled, the P (position) attribute will be cubically interpolated using the v (velocity) point attribute, and v will be quadratically interpolated using P. You need to set the Time Step parameter to control the contribution of v.

See also

Geometry nodes