Landmarks to RBF Points

Converts left side of the given landmarks to RBF Control points

/**
 * Node that converts landmarks to RBF control points.
 * 
 * Transforms landmark correspondences into RBF deformation
 * points for use with the RBF Deformer node.
 * 
 * Usage:
 * 1. Connect landmarks input
 * 2. Select side (Left/Right) for symmetric meshes
 * 3. Output RBF points for deformation
 */