Examples > Kinematic > Solids of extrusion

Solids of extrusion.

Let's create a solid of extrusion with a circular hole. An unclosed spline will be the extruded contour.

This code creates a spline:

SG_POINT tmpPnt;

SG_SPLINE* spl2 = SG_SPLINE::Create();

int fl=0;

for (double i=0.0;i<2.0*3.14159265;i+=0.13)

{

tmpPnt.x = ((double)(fl%3+2))*cos(i);

tmpPnt.y = ((double)(fl%3+2))*sin(i);

tmpPnt.z = 0.0;

spl2->AddKnot(tmpPnt,fl);

fl++;

}

spl2->Close();

sgCSpline* spl2_obj = sgCreateSpline(*spl2);

SG_SPLINE::Delete(spl2);

sgGetScene()->AttachObject(spl2_obj);

spl2_obj->SetAttribute(SG_OA_COLOR,12);

spl2_obj->SetAttribute(SG_OA_LINE_THICKNESS, 2);

The hole will have the form of the circle with 1.6 radius:

SG_CIRCLE cirGeo;

SG_POINT cirC = {0.0, 0.0, 0.0};

SG_VECTOR cirNor = {0.0, 0.0, 1.0};

cirGeo.FromCenterRadiusNormal(cirC,1.6, cirNor);

sgC2DObject* cir = sgCreateCircle(cirGeo);

sgGetScene()->AttachObject(cir);

cir->SetAttribute(SG_OA_COLOR,12);

cir->SetAttribute(SG_OA_LINE_THICKNESS, 2);

Let's extrude along the (1, -2, 5) vector:

SG_VECTOR extVec = {1,-2,5};

sgC3DObject* exO = (sgC3DObject*)sgKinematic::Extrude((const sgC2DObject&)(*spl2_obj),

(const sgC2DObject**)(&cir),1,extVec,true);

sgGetScene()->AttachObject(exO);

exO->SetAttribute(SG_OA_COLOR,30);

Then we'll move the obtained solid:

SG_VECTOR transV1 = {-7,0,0};

exO->InitTempMatrix()->Translate(transV1);

exO->ApplyTempMatrix();

exO->DestroyTempMatrix();