The Blender 4-1 Vertex Color & Vertex Alpha Gradient Maker And Visualizer is an add-on from Luke Adwick for creating, customizing, and visualizing vertex color and vertex alpha gradients on mesh objects in Blender. It handles linear, reflected, and radial gradients for both color and alpha, in any axis direction across X, Y, and Z. The developer notes it suits setting up wind bending gradients for shaders and stylized graphics.
Controls cover start percentage, gradient percentage, and radial offsets in 3D space, with support for both global and local transforms. You can set gradients for R, G, B, custom color values, alpha, and custom alpha values, and erase specific color channels. Multi-selection support applies settings to several objects at once, toggling between per-object local transform gradients and gradients across the full selection's bounding box.
A UI panel gives instant visualization of every function in the 3D View, and you can toggle visualization of vertex colors and vertex alpha directly in the viewport. When visualizing, the tool saves existing materials so they can be re-applied. It targets Blender 4.1 and ships under the GPL license. A demo video is available.