Hello I have a quick question about Zbrush. Is it possible to subtract and add to the model at the same time while using a brush with a custom alpha? What I want specifically is where the alpha is grey (value 0.5) it doesn't change the model, where the alpha is white (value 1.0) it adds to the model, where the alpha is…
You need to make a lightmap importance volume. Basically create your subtractive map, then make your red builder brush bigger than your map and create a lightmap importance volume, found under volumes. reason is because in a subtractive map you are carving out of space.
As a general rule, not just for faces, don't delete or subtract weighting. Select the bone you want to give weights to and add instead. When subtracting weights it divides up the weighting between all bones in the influence list. This can lead to unwanted results. Remember, just add weights.