Examples > Kinematic > Surfaces of extrusion

Surfaces of extrusion.

Let's create a surface of extrusion. 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<10.0;i+=1.0)

{

tmpPnt.x = i;

tmpPnt.y = (fl%2)?-i/2.0:i/2.0;

tmpPnt.z = 0.0;

spl2->AddKnot(tmpPnt,fl);

fl++;

}

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 extrude along the (1, -2, 3) vector:

SG_VECTOR extVec = {1,-2,3};

sgC3DObject* exO = (sgC3DObject*)sgKinematic::Extrude((const sgC2DObject&)(*spl2_obj),NULL,0,extVec,false);

sgGetScene()->AttachObject(exO);

exO->SetAttribute(SG_OA_COLOR,20);

Then we'll move the obtained surface:

SG_VECTOR transV1 = {8,0,0};

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

exO->ApplyTempMatrix();

exO->DestroyTempMatrix();