Time Machine compositing node

Uses a second input to time warp the first input on a per pixel basis.

All

Parameters

Local variables

See also: Time Warp, Time Filter, Time Scale, Shift

This operation uses a second input image to time warp the first input sequence on a per pixel basis. The second input image’s luminance is used to determine which frame to access in the first input. The 'Black Pixel Frame' and 'White Pixel Frame' are used to specify the frame range that the luminance values map to.

Tip

Try a Ramp or Noise COP as the second input.

Overloading VEX Parameters

This operator is implemented in VEX, which supports parameter overloading. If the first input has a plane which matches an operation parameter’s channel name, the input plane will be used as the parameter’s value, effectively overriding it. The overloaded parameter is then evaluated from the plane on a per-pixel basis.

eg. If the input COP has the following planes:

C{r,g,b}
A
fogdens

and it is fed into a VEX Fog COP, the fog density will be determined at each pixel by the fogdens plane, since the Fog Density parameter’s channel name matches the 'fogdens' channel name.

Scoping

This operation may be restricted to certain planes, or components of planes. In addition, the operation may be applied to a subset of frames within the sequence. An image must have both its frame and plane scoped to be modified.

Images that are not modified are passed through, which does not take any memory or processing time.

Masking

This operation may be masked, which restricts the operation to an area of the image. The mask may be inverted, brightened or dimmed.

The mask input is on the side of the node. The label on the connector indicates the plane being used as a mask.

The mask input can also be scaled to fit the output image’s resolution, if they differ. However, if this node changes more often than the mask input, it is faster to place a Scale COP in front of the mask input to do the resize, as the resize will not occur on every cook of this node.

Parameters

Time Machine

Black Pixel Frame

The frame value that a black pixel represents.

White Pixel Frame

The frame value that a white pixel represents.

Pixels between the black and white will have frame values that are linearly interpolated between the Black Pixel Frame and the White Pixel Frame. Values above white or below black will be extrapolated.

Relative to Current Frame

If on, the frame value is added to the current frame, making the frame value an offset from the current frame. If off, the frame values represent actual frame numbers.

Blend Frames

If on, fractional frames are computed and pixels from the two nearest frames are linearly blended together to produce the output frame’s pixel.

Before Start

If a filtered frame is before the beginning of the sequence, this determines what frame to use.

Black	A black frame.
Cycle	Cycle back into the sequence from the end (so 2 frames before the start will use frame 'end-2').
Mirror	Mirror back into the sequence (so 2 frames before will use frame 'start+2').
Hole	Use the first frame.

After End

Similar to 'Before Start', except this parameter determines what frame to use if filtering goes past the last frame of the sequence.