Hello, I am looking for suggestions from the CHIMERA developers and users’ community to address a rendering problem I have. I have computed electric field data for protein ligand binding sites (wt and related mutants) and would like to render this field data as a collection of vectors, superimposed over a nice rendering of the binding site structures. The field results are from a series of QM/MM calculations we have performed, and are in a simple ASCII format: cartesian coordinates for N grid points, followed by cartesian coordinates of the N field vectors that originate from the corresponding grid points. I’ve debated whether I might be able to subvert the PseudoBond reader to somehow process these data, but still don’t have an easy option to display each field vector as a short arrow. Note that I don’t want to render the electric field data as a set of continuous color-coded field lines. That is easy in any number of molecular graphics programs. I know that rendering fields as a collection of vectors (arrows) is “old-fashioned”, but in this case we are convinced the old-fashioned render is a more effective way to communicate our results. Thanks in advance for any suggestions. Terry L. P.S. Greetings to all my former colleagues at UCSF. ++++++++++++++++++++++++++++++++++++++++++++ Terry P. Lybrand Prof. of Chemistry - College of Arts & Science Professor of Pharmacology - School of Medicine Vanderbilt University Center for Structural Biology 5-154C BioSciences/MRB III Nashville, TN 37232-8725 Telephone: 615-343-1247 Fax: 615-936-2211 e-mail: terry.p.lybrand@vanderbilt.edu<mailto:terry.p.lybrand@vanderbilt.edu> WWW: http://structbio.vanderbilt.edu/lybrand