Get a Material to use with a square brush plane/ROI indicator that has an analytic falloff function combined w/ an alpha mask texture. Falloff value will be used for both color and opacity, rendered as Additive with depth-testing disabled Material Parameters: "BrushAlpha" - Texture2D Parameter for brush alpha texture map "AlphaPower" - configure whether BrushAlpha texture is multiplied w/ analytic falloff (0 -> disabled, 1 -> enabled) "FalloffRatio" - float in range [0,1] that corresponds to width of brush falloff region "FalloffMode" - float in range [0,1] used to interpolate between Smooth (0) -> Linear (0.3333) -> Inverse (0.6666) -> Round (1.0) "FalloffShape" - float in range [0,1] used to interpolate between Circular (0.0) and Square (1.0) "IntensityScale" - float in range [0,1], multiplier on brightness of falloff highlight (default 0.2)