I am trying to develop an application similar to volume rendering. Here I am considering Rays as traversing in cone beam (similar to perspective geometry) fashion. Each ray makes an angle say phi with the ray going through the center of the volume.

Now my problem is that, few of my rays are missing the volume. Because of which my the rendered volume is clipped at the sides.

Any suggestion for overcoming this issue.

( I test the rays against a bounding box. Bounding box is defined to be width, height and depth of the volume)