title: How to interpolate color of a irregular point cloud from values only given to a few points?
body: <p>I have a 3D model which is a bust (so an irregular shape), I also have taken measurements of the composition (XRF) at random points over the surface of the object (I know where they are from reference photos). I would like to:</p>
  <p>a) select/isolate the vertex on the 3D model which represents the closest to where they XRF measurement was taken, and assign a value to it from the data. There are not so many of these so I can do this manually. The main question is:</p>
  <p>b) create a color ramp based on the values assigned to the vertices (n = 20 out of the 2 million vertices for the model) and interpolate the color of all of the rest of the vertices based on these values. So essentially I would show differences in elemental composition over the surface of the object.</p>
  <p>What I would like to achieve would look somewhat like:</p>
  <p><a href="https://i.stack.imgur.com/AzdUQ.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/AzdUQ.jpg" alt="example" /></a></p>
  <p>I am happy to use any software or language which would achieve this. I assume I'm looking for some form of interpolation tool that also allows for a variable search radius. The ability to interpolate the colors on the point cloud is enough, I can create a mesh/texture from there with MeshLab.</p>