1. A method, comprising: obtaining image data generated by an imaging system; generating data indicative of a degree to which each of a plurality of voxels of the image data corresponds to one or more predetermined geometrical features, wherein each geometrical feature is assigned a different color, the one or more geometrical features includes at least one of blobness and tubularness, and a given voxel of the data has a degree of blobness and a degree of tubularness; estimating a quadric for each of the plurality of voxels, wherein the quadric includes a matrix of coefficients; determining eigenvalues of the quadrics, based on the matrix of coefficients, including three eigenvalues, first, second and third eigenvalues; determining the degree for the voxels based on the eigenvalues, wherein a degree of blobness is determined as product of the second eigenvalue and a ratio of second eigenvalue to the first eigenvalue, and a degree of tubularness is determined as a product of the third eigenvalue and a ratio of third eigenvalue to the second eigenvalue; generating a signal indicative of a single color value for each of the plurality of voxels based on the degree and the colors; generating a volumetric rending of the image data based on the signal; generating a link between voxels of the volumetric rendering and voxels of the image data; and visually presenting the image data and the volumetric rendering concurrently.