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Red/Green/Blue/Alpha Channel Selector
These four buttons are used to limit the effect of the tool to specified color channels. This filter is often
applied after the tool has been processed.
For example, if the red button on a Blur tool is deselected, the blur will first be applied to the image,
and then the red channel from the original input will be copied back over the red channel of the result.
There are some exceptions, such as tools for which deselecting these channels causes the tool to skip
processing that channel entirely. Tools that do this will generally possess a set of identical RGBA
buttons on the Controls tab in the tool. In this case, the buttons in the Settings and the Controls tabs
are identical.
Apply Mask Inverted
Enabling the Apply Mask Inverted option inverts the complete mask channel for the tool. The mask
channel is the combined result of all masks connected to or generated in a node.
Multiply by Mask
Selecting this option will cause the RGB values of the masked image to be multiplied by the mask
channel’s values. This will cause all pixels of the image not in the mask (i.e., set to 0) to become black/
transparent.
Use Object/Use Material (Checkboxes)
Some 3D software can render to file formats that support additional channels. Notably, the EXR file
format supports Object ID and Material ID channels, which can be used as a mask for the effect. These
checkboxes determine whether the channels will be used if present. The specific Material ID or Object
ID affected is chosen using the next set of controls.
Correct Edges
This checkbox appears only when the Use Object or Use Material checkboxes are selected. It toggles
the method used to deal with overlapping edges of objects in a multi-object image. When enabled,
the Coverage and Background Color channels are used to separate and improve the effect around the
edge of the object. If this option disabled (or no Coverage or Background Color channels are
available), aliasing may occur on the edge of the mask.
For more information see Chapter 18 “Understanding Image Channels,” in the Fusion Reference
Manual or Chapter 78 in the DaVinci Resolve Reference Manual
Object ID/Material ID (Sliders)
Use these sliders to select which ID will be used to create a mask from the object or material channels
of an image. Use the Sample button in the same way as the Color Picker: to grab IDs from the image
displayed in the view. The image or sequence must have been rendered from a 3D software package
with those channels included.
Motion Blur
– Motion Blur: This toggles the rendering of Motion Blur on the tool. When this control is toggled
on, the tool’s predicted motion is used to produce the motion blur caused by the virtual camera’s
shutter. When the control is toggled off, no motion blur is created.
– Quality: Quality determines the number of samples used to create the blur. A quality setting of 2
will cause Fusion to create two samples to either side of an object’s actual motion. Larger values
produce smoother results but increase the render time.
– Shutter Angle: Shutter Angle controls the angle of the virtual shutter used to produce the motion
blur effect. Larger angles create more blur but increase the render times. A value of 360 is the
equivalent of having the shutter open for one whole frame exposure. Higher values are possible
and can be used to create interesting effects.
Chapter 103Generator Nodes 1995
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