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Various factors affect the quality of 3D images, such as the number of vertices and the resolution of texture. In this report, we discuss the factors determining the quality of 3D images. Among these factors two important ones, most relevant for bandwidth constrained online applications, are combined to model a perceptual metric. We estimate this metric from the statistical data collected in a 3D quality evaluation experiment. The theory behind modeling a quality metric and the details of experiments performed for deriving the parameters of this metric are described.