Blob Tracker
Method #
This node generates tracked blobs from an input image, and outputs transform information for each of those blobs. Generally used with transform arrays, to link blob motion to other nodes.
Input images need to be prepared for this node to function, usually ending with a threshold node to make a clear distinction between blobs and the rest of the content.
Parameters
These properties control the core behaviours of the node.
Parameter Details Preview In Viewport Preview the generated image as an overlay in the viewport.
- Off : No preview is generated.
- RGBA : Preview the image blended with alpha in the viewport.
- RGB : Preview the colour channels in the viewport.
- Alpha : Preview the alpha channel in the viewport.
- PIP : Preview the image blended with alpha in the viewport, in a smaller picture in picture display, on top of the existing content.
Apply PostFX Before Alpha Image Input (Legacy) When enabled, the alpha input image is applied after the postfx pass, overwriting any effects the postfx would have applied to the alpha channel.
Inputs
These properties control the core behaviours of the node.
| Parameter | Details |
|---|---|
| Preview In Viewport | Preview the generated image as an overlay in the viewport.
|
| Apply PostFX Before Alpha Image Input (Legacy) | When enabled, the alpha input image is applied after the postfx pass, overwriting any effects the postfx would have applied to the alpha channel. |
| Name | Description | Typical Input |
|---|---|---|
| Effect Mask | Mask out areas that Post-FX applied to this node won’t be applied. | Loader |
| Alpha Image | Use a separate video nodes luminance values to overwrite the alpha channel of the image. | Loader |
| Active | Enables or disables the effect. Disabling the effect means it will no longer compute, so disabling a node when not in use can improve performance. | Envelope Modifier |