In this paper we evaluate one interaction method and four display techniques for exploring volumetric datasets
in virtual reality immersive environments. We propose an approach based on the display of a subset of the
volumetric data, as isosurfaces, and an interactive manipulation of the isosurfaces to allow the user to look for
local feature in the datasets. We also studied the influence of four different rendering techniques for isosurface
rendering in a virtual reality system. The study is based on a search and point task in a 3D temperature
field. User precision, task completion time and user movement were evaluated during the test. The study
allowed to choose the most suitable rendering mode for isosurface representation, and provided guidelines for
data exploration tasks in immersive environments.