ENH add blend_curvature method to Vertex, Vertex2D, and VertexRGB #425
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Vertex objects cannot use transparency as Volume objects because they are implemented differently in the viewer.
This PR adds a method to Vertex, Vertex2D, and VertexRGB, to mimic the transparency of Volume objects. The method blends the Vertex data with a curvature map, depending on a transparency (alpha) map, and returns a VertexRGB object.
It is a workaround for #323 and #387, using the method described in #323 (comment).