Examples > Kinematic > Solids of revolution

Solids of revolution.

Let's create a solid of revolution. A closed spline will be the rotated 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+=0.4)

{

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);

sgGetScene()->AttachObject(spl2_obj);

spl2_obj->SetAttribute(SG_OA_COLOR,12);

spl2_obj->SetAttribute(SG_OA_LINE_THICKNESS,2);

SG_SPLINE::Delete(spl2);

Let's rotate the contour around the axis lying on the (10, 10, 0) and (20, 15, 0) points. The rotation angle will be 290 degrees:

SG_POINT p1 = {10,10,0};

SG_POINT p2 = {20,15,0};

sgC3DObject* rO = (sgC3DObject*)sgKinematic::Rotation(*spl2_obj,p1,p2,290,true);

sgGetScene()->AttachObject(rO);

rO->SetAttribute(SG_OA_COLOR,8);

Then we'll move the obtained solid:

SG_VECTOR transV1 = {-6,0,0};

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

rO->ApplyTempMatrix();

rO->DestroyTempMatrix();