Examples > Surfaces > Ruled surface from clips

Ruled surface from clips.

Let's create three ruled surfaces from two contours - a circle and a spline with different spiral degrees.

To start with, let's draw a circle and a spline:

SG_POINT tmpPnt;

SG_SPLINE* spl1 = 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;

spl1->AddKnot(tmpPnt,fl);

fl++;

}

spl1->Close();

sgCSpline* spl1_obj = sgCreateSpline(*spl1);

sgGetScene()->AttachObject(spl1_obj);

spl1_obj->SetAttribute(SG_OA_COLOR,12);

spl1_obj->SetAttribute(SG_OA_LINE_THICKNESS, 2);

SG_SPLINE::Delete(spl1);

SG_CIRCLE cirGeo;

cirGeo.center.x = 2.0; cirGeo.center.y = -2.0; cirGeo.center.z = 8.0;

cirGeo.normal.x = 0.0; cirGeo.normal.y = 0.0; cirGeo.normal.z = 1.0;

cirGeo.radius = 1.5;

sgCCircle* cir = sgCreateCircle(cirGeo);

sgGetScene()->AttachObject(cir);

cir->SetAttribute(SG_OA_COLOR,12);

cir->SetAttribute(SG_OA_LINE_THICKNESS, 2);

Then we'll construct the ruled surfaces and move them at once.

The first surface:

sgC3DObject* linO1 = (sgC3DObject*)sgSurfaces::LinearSurfaceFromSections((const sgC2DObject&)(*spl1_obj),

(const sgC2DObject&)(*cir),0.5,false);

sgGetScene()->AttachObject(linO1);

linO1->SetAttribute(SG_OA_COLOR,90);

SG_VECTOR transV1 = {0,7,0};

linO1->InitTempMatrix()->Translate(transV1);

linO1->ApplyTempMatrix();

linO1->DestroyTempMatrix();

The second surface:

sgC3DObject* linO2 = (sgC3DObject*)sgSurfaces::LinearSurfaceFromSections((const sgC2DObject&)(*spl1_obj),

(const sgC2DObject&)(*cir),0.7,false);

sgGetScene()->AttachObject(linO2);

linO2->SetAttribute(SG_OA_COLOR,150);

transV1.x = 8.0; transV1.y = 0.0;

linO2->InitTempMatrix()->Translate(transV1);

linO2->ApplyTempMatrix();

linO2->DestroyTempMatrix();

The third surface:

sgC3DObject* linO3 = (sgC3DObject*)sgSurfaces::LinearSurfaceFromSections((const sgC2DObject&)(*spl1_obj),

(const sgC2DObject&)(*cir),0.3,false);

sgGetScene()->AttachObject(linO3);

linO3->SetAttribute(SG_OA_COLOR,30);

transV1.x = -8.0; transV1.y = 0.0;

linO3->InitTempMatrix()->Translate(transV1);

linO3->ApplyTempMatrix();

linO3->DestroyTempMatrix();