+ else if (orientation == PARTICLE_ORIENTED_DOUBLESIDED)
+ {
+ // double-sided
+ if (DotProduct(p->vel2, r_origin) > DotProduct(p->vel2, org))
+ {
+ VectorNegate(p->vel2, v);
+ VectorVectors(v, right, up);
+ }
+ else
+ VectorVectors(p->vel2, right, up);
+ VectorScale(right, p->scalex, right);
+ VectorScale(up, p->scaley, up);
+ varray_vertex[ 0] = org[0] + right[0] - up[0];
+ varray_vertex[ 1] = org[1] + right[1] - up[1];
+ varray_vertex[ 2] = org[2] + right[2] - up[2];
+ varray_vertex[ 4] = org[0] - right[0] - up[0];
+ varray_vertex[ 5] = org[1] - right[1] - up[1];
+ varray_vertex[ 6] = org[2] - right[2] - up[2];
+ varray_vertex[ 8] = org[0] - right[0] + up[0];
+ varray_vertex[ 9] = org[1] - right[1] + up[1];
+ varray_vertex[10] = org[2] - right[2] + up[2];
+ varray_vertex[12] = org[0] + right[0] + up[0];
+ varray_vertex[13] = org[1] + right[1] + up[1];
+ varray_vertex[14] = org[2] + right[2] + up[2];
+ }
+ else
+ Host_Error("R_DrawParticles: unknown particle orientation %i\n", orientation);
+ R_Mesh_Draw(4, 2, polygonelements);