- if (p->orientation == PARTICLE_BILLBOARD)
- {
- VectorScale(vright, p->scalex, right);
- VectorScale(vup, 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 if (p->orientation == PARTICLE_SPARK)
- {
- VectorMA(p->org, -p->scaley, p->vel, v);
- VectorMA(p->org, p->scaley, p->vel, up2);
- R_CalcBeamVerts(varray_vertex, v, up2, p->scalex);
- }
- else if (p->orientation == PARTICLE_BEAM)
- R_CalcBeamVerts(varray_vertex, p->org, p->vel2, p->scalex);
- else if (p->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", p->orientation);
-