NURBS曲线显示

/*-------------------------------------------------------- * This example creates and displays a B-Spline curve. * The curve is order 3 with 7 control points and a knot * vector of length 10. One of its knots has multiplicity * 2 to illustrate a curve with a spike in it. *--------------------------------------------------------*/#include <Inventor/SoDB.h>#include <Inventor/SoInput.h>#include <Inventor/Win/SoWin.h>#include <Inventor/Win/viewers/SoWinExaminerViewer.h>#include <Inventor/nodes/SoBaseColor.h>#include <Inventor/nodes/SoCamera.h>#include <Inventor/nodes/SoComplexity.h>#include <Inventor/nodes/SoCoordinate3.h>#include <Inventor/nodes/SoDrawStyle.h>#include <Inventor/nodes/SoLightModel.h>#include <Inventor/nodes/SoMaterial.h>#include <Inventor/nodes/SoNurbsCurve.h>#include <Inventor/nodes/SoRotation.h>#include <Inventor/nodes/SoScale.h>#include <Inventor/nodes/SoSeparator.h>#include <Inventor/nodes/SoTranslation.h>#ifdef WIN32#endif// Maximum length of Microsoft string literal is 2048 bytes!!!!// Break it into 2 pieces.// Also change path for texture image files to relative path.static char *floorData1 = "#Inventor V2.0 ascii/n""Separator {/n"" SpotLight {/n"" cutOffAngle 0.9/n"" dropOffRate 0.2/n" " location 6 12 2/n" " direction 0 -1 0/n"" }/n"" ShapeHints {/n"" faceType UNKNOWN_FACE_TYPE/n"" }/n"" Texture2Transform {/n"" #rotation 1.57/n"" scaleFactor 8 8/n"" }/n"" Texture2 {/n"" filename ../data/oak.gif/n"" }/n"" NormalBinding {/n"" value PER_PART/n"" }/n"" Material { diffuseColor 1 1 1 specularColor 1 1 1 shininess 0.4 }/n"" DEF FloorPanel Separator {/n"" DEF FloorStrip Separator {/n"" DEF FloorBoard Separator {/n"" Normal { vector 0 1 0 }/n"" TextureCoordinate2 {/n"" point [ 0 0, 0.5 0, 0.5 2, 0.5 4, 0.5 6,/n"" 0.5 8, 0 8, 0 6, 0 4, 0 2 ] }/n"" Coordinate3 {/n"" point [ 0 0 0, .5 0 0, .5 0 -2, .5 0 -4, .5 0 -6,/n"" .5 0 -8, 0 0 -8, 0 0 -6, 0 0 -4, 0 0 -2, ]/n"" }/n"" FaceSet { numVertices 10 }/n"" BaseColor { rgb 0.3 0.1 0.0 }/n"" Translation { translation 0.125 0 -0.333 }/n"" Cylinder { parts TOP radius 0.04167 height 0.002 }/n"" Translation { translation 0.25 0 0 }/n"" Cylinder { parts TOP radius 0.04167 height 0.002 }/n"" Translation { translation 0 0 -7.333 }/n"" Cylinder { parts TOP radius 0.04167 height 0.002 }/n"" Translation { translation -0.25 0 0 }/n"" Cylinder { parts TOP radius 0.04167 height 0.002 }/n"" }/n";static char *floorData2 = " Translation { translation 0 0 8.03 }/n"" USE FloorBoard/n"" Translation { translation 0 0 8.04 }/n"" USE FloorBoard/n"" }/n"" Translation { translation 0.53 0 -0.87 }/n"" USE FloorStrip/n"" Translation { translation 0.53 0 -2.3 }/n"" USE FloorStrip/n"" Translation { translation 0.53 0 1.3 }/n"" USE FloorStrip/n"" Translation { translation 0.53 0 1.1 }/n"" USE FloorStrip/n"" Translation { translation 0.53 0 -0.87 }/n"" USE FloorStrip/n"" Translation { translation 0.53 0 1.7 }/n"" USE FloorStrip/n"" Translation { translation 0.53 0 -0.5 }/n"" USE FloorStrip/n"" }/n"" Translation { translation 4.24 0 0 }/n"" USE FloorPanel/n"" Translation { translation 4.24 0 0 }/n"" USE FloorPanel/n""}";static char *floorData;////////////////////////////////////////////////////////////// CODE FOR The Inventor Mentor STARTS HERE// The control points for this curveconst float pts[7][3] = { { 4.0, -6.0, 6.0}, {-4.0, 1.0, 0.0}, {-1.5, 5.0, -6.0}, { 0.0, 2.0, -2.0}, { 1.5, 5.0, -6.0}, { 4.0, 1.0, 0.0}, {-4.0, -6.0, 6.0}};// The knot vectorfloat knots[10] = {1, 2, 3, 4, 5, 5, 6, 7, 8, 9};// Create the nodes needed for the B-Spline curve.SoSeparator *makeCurve(){ SoSeparator *curveSep = new SoSeparator(); curveSep->ref(); // Set the draw style of the curve. SoDrawStyle *drawStyle = new SoDrawStyle; drawStyle->lineWidth = 4; curveSep->addChild(drawStyle); // Define the NURBS curve including the control points // and a complexity. SoComplexity *complexity = new SoComplexity; SoCoordinate3 *controlPts = new SoCoordinate3; SoNurbsCurve *curve = new SoNurbsCurve; complexity->value = 0.8f; controlPts->point.setValues(0, 7, pts); curve->numControlPoints = 7; curve->knotVector.setValues(0, 10, knots); curveSep->addChild(complexity); curveSep->addChild(controlPts); curveSep->addChild(curve); curveSep->unrefNoDelete(); return curveSep;}// CODE FOR The Inventor Mentor ENDS HERE////////////////////////////////////////////////////////////intmain(int, char **argv){ floorData = new char[strlen(floorData1) + strlen(floorData2) + 1]; strcpy(floorData, floorData1); strcat(floorData, floorData2); // Initialize Inventor and Win HWND appWindow = SoWin::init(argv[0]); if (appWindow == NULL) exit(1); SoSeparator *root = new SoSeparator; root->ref(); // Create the scene graph for the heart SoSeparator *heart = new SoSeparator; SoSeparator *curveSep = makeCurve(); SoLightModel *lmodel = new SoLightModel; SoBaseColor *clr = new SoBaseColor; lmodel->model = SoLightModel::BASE_COLOR; clr->rgb.setValue(SbColor(1.0f, 0.0f, 0.1f)); heart->addChild(lmodel); heart->addChild(clr); heart->addChild(curveSep); root->addChild(heart); // Create the scene graph for the floor SoSeparator *floor = new SoSeparator; SoTranslation *xlate = new SoTranslation; SoRotation *rot = new SoRotation; SoScale *scale = new SoScale; SoInput in; SoNode *result; in.setBuffer(floorData, strlen(floorData)); SoDB::read(&in, result); xlate->translation.setValue(SbVec3f(-12.0f, -5.0f, -5.0f)); scale->scaleFactor.setValue(SbVec3f(2.0f, 1.0f, 2.0f)); rot->rotation.setValue(SbRotation(SbVec3f(0.0f, 1.0f, 0.0f), (float)(M_PI/2.0f))); floor->addChild(rot); floor->addChild(xlate); floor->addChild(scale); floor->addChild(result); root->addChild(floor); // Create the scene graph for the heart's shadow SoSeparator *shadow = new SoSeparator; SoLightModel *shmdl = new SoLightModel; SoMaterial *shmtl = new SoMaterial; SoBaseColor *shclr = new SoBaseColor; SoTranslation *shxl = new SoTranslation; SoScale *shscl = new SoScale; shmdl->model = SoLightModel::BASE_COLOR; shclr->rgb.setValue(SbColor(0.21f, 0.15f, 0.09f)); shmtl->transparency = 0.5f; shxl->translation.setValue(SbVec3f(0.0f, -4.9f, 0.0f)); shscl->scaleFactor.setValue(SbVec3f(1.0f, 0.0f, 1.0f)); shadow->addChild(shmtl); shadow->addChild(shmdl); shadow->addChild(shclr); shadow->addChild(shxl); shadow->addChild(shscl); shadow->addChild(curveSep); root->addChild(shadow); // Initialize an Examiner Viewer SoWinExaminerViewer *viewer = new SoWinExaminerViewer(appWindow); viewer->setSceneGraph(root); viewer->setTitle("B-Spline Curve"); SoCamera *cam = viewer->getCamera(); cam->position.setValue(SbVec3f(-6.0f, 8.0f, 20.0f)); cam->pointAt(SbVec3f(0.0f, -2.0f, -4.0f)); viewer->show(); SoWin::show(appWindow); SoWin::mainLoop(); delete floorData; return 0;}