Vertex Painter is a tool for generating weight paints (vertex groups) and vertex paints (vertex colors) using procedural masking. It includes three distinct mask types that can be used individually or combined, with adjustments updating in real time. The Camera mask restricts painting to the active camera's field of view, which is useful for optimizing particle distribution by culling unseen areas. The Slope mask applies paint based on the surface angle of the mesh, allowing for distinct material or scatter placement on cliffs versus flat ground using adjustable thresholds. The Altitude mask generates paint based on the height of the geometry, suitable for defining tree lines or mountain snow caps.