Float Vertex Attribute
The Float Vertex Attribute node operates similar to the Color Vertex Attribute node. The difference is that this node receives a Float value from the vertex paint data to use for material attributes such as opacity.
In the Object Spare Parameters, the attribute Name from the Attribute Paint node needs to be added to the Point Float Attrs. parameter in the Attributes tab (Figure 1). Unlike the Color Vertex Attribute where the Name is added to the Point Vector Attrs.
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Float Vertex Attribute
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Figure 1: Adding the Name attribute to the Point Float Attrs