C++ SMesh::AddTriangle方法代码示例

SBsp3 *SBsp3::FromMesh(SMesh *m) {
    SBsp3 *bsp3 = NULL;
    int i;

    SMesh mc; ZERO(&mc);
    for(i = 0; i < m->l.n; i++) {
        mc.AddTriangle(&(m->l.elem[i]));
    }

    srand(0); // Let's be deterministic, at least!
    int n = mc.l.n;
    while(n > 1) {
        int k = rand() % n;
        n--;
        SWAP(STriangle, mc.l.elem[k], mc.l.elem[n]);
    }

    for(i = 0; i < mc.l.n; i++) {
        bsp3 = bsp3->Insert(&(mc.l.elem[i]), NULL);
    }

    mc.Clear();
    return bsp3;
}

void SolveSpace::ExportLinesAndMesh(SEdgeList *sel, SBezierList *sbl, SMesh *sm,
                                    Vector u, Vector v, Vector n,
                                        Vector origin, double cameraTan,
                                    VectorFileWriter *out)
{
    double s = 1.0 / SS.exportScale;

    // Project into the export plane; so when we're done, z doesn't matter,
    // and x and y are what goes in the DXF.
    SEdge *e;
    for(e = sel->l.First(); e; e = sel->l.NextAfter(e)) {
        // project into the specified csys, and apply export scale
        (e->a) = e->a.InPerspective(u, v, n, origin, cameraTan).ScaledBy(s);
        (e->b) = e->b.InPerspective(u, v, n, origin, cameraTan).ScaledBy(s);
    }

    SBezier *b;
    if(sbl) {
        for(b = sbl->l.First(); b; b = sbl->l.NextAfter(b)) {
            *b = b->InPerspective(u, v, n, origin, cameraTan);
            int i;
            for(i = 0; i <= b->deg; i++) {
                b->ctrl[i] = (b->ctrl[i]).ScaledBy(s);
            }
        }
    }

    // If cutter radius compensation is requested, then perform it now
    if(fabs(SS.exportOffset) > LENGTH_EPS) {
        // assemble those edges into a polygon, and clear the edge list
        SPolygon sp;
        ZERO(&sp);
        sel->AssemblePolygon(&sp, NULL);
        sel->Clear();

        SPolygon compd;
        ZERO(&compd);
        sp.normal = Vector::From(0, 0, -1);
        sp.FixContourDirections();
        sp.OffsetInto(&compd, SS.exportOffset*s);
        sp.Clear();

        compd.MakeEdgesInto(sel);
        compd.Clear();
    }

    // Now the triangle mesh; project, then build a BSP to perform
    // occlusion testing and generated the shaded surfaces.
    SMesh smp;
    ZERO(&smp);
    if(sm) {
        Vector l0 = (SS.lightDir[0]).WithMagnitude(1),
               l1 = (SS.lightDir[1]).WithMagnitude(1);
        STriangle *tr;
        for(tr = sm->l.First(); tr; tr = sm->l.NextAfter(tr)) {
            STriangle tt = *tr;
            tt.a = (tt.a).InPerspective(u, v, n, origin, cameraTan).ScaledBy(s);
            tt.b = (tt.b).InPerspective(u, v, n, origin, cameraTan).ScaledBy(s);
            tt.c = (tt.c).InPerspective(u, v, n, origin, cameraTan).ScaledBy(s);

            // And calculate lighting for the triangle
            Vector n = tt.Normal().WithMagnitude(1);
            double lighting = SS.ambientIntensity +
                                  max(0, (SS.lightIntensity[0])*(n.Dot(l0))) +
                                  max(0, (SS.lightIntensity[1])*(n.Dot(l1)));
            double r = min(1, REDf  (tt.meta.color)*lighting),
                   g = min(1, GREENf(tt.meta.color)*lighting),
                   b = min(1, BLUEf (tt.meta.color)*lighting);
            tt.meta.color = RGBf(r, g, b);
            smp.AddTriangle(&tt);
        }
    }

    // Use the BSP routines to generate the split triangles in paint order.
    SBsp3 *bsp = SBsp3::FromMesh(&smp);
    SMesh sms;
    ZERO(&sms);
    bsp->GenerateInPaintOrder(&sms);
    // And cull the back-facing triangles
    STriangle *tr;
    sms.l.ClearTags();
    for(tr = sms.l.First(); tr; tr = sms.l.NextAfter(tr)) {
        Vector n = tr->Normal();
        if(n.z < 0) {
            tr->tag = 1;
        }
    }
    sms.l.RemoveTagged();

    // And now we perform hidden line removal if requested
    SEdgeList hlrd;
    ZERO(&hlrd);
    if(sm && !SS.GW.showHdnLines) {
        SKdNode *root = SKdNode::From(&smp);

        // Generate the edges where a curved surface turns from front-facing
        // to back-facing.
        if(SS.GW.showEdges) {
            root->MakeCertainEdgesInto(sel, SKdNode::TURNING_EDGES,
                        false, NULL, NULL);
//.........这里部分代码省略.........