Lines Matching refs:sUnit
202 GLdouble *sUnit, *tUnit;
212 sUnit = tess->sUnit;
217 /* Choose the initial sUnit vector to be approximately perpendicular
222 sUnit[i] = 0;
223 sUnit[(i+1)%3] = S_UNIT_X;
224 sUnit[(i+2)%3] = S_UNIT_Y;
227 w = Dot( sUnit, norm );
228 sUnit[0] -= w * norm[0];
229 sUnit[1] -= w * norm[1];
230 sUnit[2] -= w * norm[2];
231 Normalize( sUnit );
233 /* Choose tUnit so that (sUnit,tUnit,norm) form a right-handed frame */
234 tUnit[0] = norm[1]*sUnit[2] - norm[2]*sUnit[1];
235 tUnit[1] = norm[2]*sUnit[0] - norm[0]*sUnit[2];
236 tUnit[2] = norm[0]*sUnit[1] - norm[1]*sUnit[0];
240 sUnit[i] = 0;
241 sUnit[(i+1)%3] = S_UNIT_X;
242 sUnit[(i+2)%3] = S_UNIT_Y;
251 v->s = Dot( v->coords, sUnit );