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A new error metric is applied for estimating accuracy of MoM solutions on purely 3-D geometries using triangle doublet basis functions. This error metric is based on checking boundary conditions performance (BCP) on scatterer surface and shown to be suited for arbitrary 3-D geometries including open ones. First, accurate expressions for the scattered field are derived to be valid at any observation points including those on the surface of triangles. Further, BCP error metric is examined for estimating accuracy of the scattering problem solution on open cube geometry, and to find the correlation of BCP error with that for near-field characteristics. Finally, BCP error metric is applied to estimate accuracy of MoM solutions on realistic car model, and to find the contributions of its elements to the total error. [ABSTRACT FROM AUTHOR]