+ const int_list& va(verts[i]);
+ const int_list& na((idx_mask & SG_IDX_NORMALS) ? normals[i] : emptyList);
+ const int_list& ca((idx_mask & SG_IDX_COLORS) ? colors[i] : emptyList);
+ const int_list& tca((idx_mask & SG_IDX_TEXCOORDS) ? texCoords[i] : emptyList);
+