OpenGLUT 0.6.3 development - OpenGLUT: nurbs.c File Reference
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# nurbs.c File Reference

## Detailed Description

This program shows a NURBS (Non-uniform rational B-splines) surface, shaped like a heart.

    /* Copyright (c) Mark J. Kilgard, 1994. */

    /*
     * (c) Copyright 1993, Silicon Graphics, Inc.
     * ALL RIGHTS RESERVED
     * Permission to use, copy, modify, and distribute this software for
     * any purpose and without fee is hereby granted, provided that the above
     * copyright notice appear in all copies and that both the copyright notice
     * and this permission notice appear in supporting documentation, and that
     * the name of Silicon Graphics, Inc. not be used in advertising
     * or publicity pertaining to distribution of the software without specific,
     * written prior permission.
     *
     * THE MATERIAL EMBODIED ON THIS SOFTWARE IS PROVIDED TO YOU "AS-IS"
     * AND WITHOUT WARRANTY OF ANY KIND, EXPRESS, IMPLIED OR OTHERWISE,
     * INCLUDING WITHOUT LIMITATION, ANY WARRANTY OF MERCHANTABILITY OR
     * FITNESS FOR A PARTICULAR PURPOSE.  IN NO EVENT SHALL SILICON
     * GRAPHICS, INC.  BE LIABLE TO YOU OR ANYONE ELSE FOR ANY DIRECT,
     * SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY
     * KIND, OR ANY DAMAGES WHATSOEVER, INCLUDING WITHOUT LIMITATION,
     * LOSS OF PROFIT, LOSS OF USE, SAVINGS OR REVENUE, OR THE CLAIMS OF
     * THIRD PARTIES, WHETHER OR NOT SILICON GRAPHICS, INC.  HAS BEEN
     * ADVISED OF THE POSSIBILITY OF SUCH LOSS, HOWEVER CAUSED AND ON
     * ANY THEORY OF LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE
     * POSSESSION, USE OR PERFORMANCE OF THIS SOFTWARE.
     *
     * US Government Users Restricted Rights
     * Use, duplication, or disclosure by the Government is subject to
     * restrictions set forth in FAR 52.227.19(c)(2) or subparagraph
     * (c)(1)(ii) of the Rights in Technical Data and Computer Software
     * clause at DFARS 252.227-7013 and/or in similar or successor
     * clauses in the FAR or the DOD or NASA FAR Supplement.
     * Unpublished-- rights reserved under the copyright laws of the
     * United States.  Contractor/manufacturer is Silicon Graphics,
     * Inc., 2011 N.  Shoreline Blvd., Mountain View, CA 94039-7311.
     *
     * OpenGL(TM) is a trademark of Silicon Graphics, Inc.
     */

    #include <GL/openglut.h>
    #include <stdlib.h>

    #define S_NUMPOINTS 13
    #define S_ORDER     3
    #define S_NUMKNOTS  (S_NUMPOINTS + S_ORDER)
    #define T_NUMPOINTS 3
    #define T_ORDER     3
    #define T_NUMKNOTS  (T_NUMPOINTS + T_ORDER)
    #define SQRT2    1.41421356237309504880

    /* initialized local data */

    GLfloat sknots[S_NUMKNOTS] =
        {-1.0, -1.0, -1.0, 0.0, 1.0, 2.0, 3.0, 4.0,
          4.0,  5.0,  6.0, 7.0, 8.0, 9.0, 9.0, 9.0};
    GLfloat tknots[T_NUMKNOTS] = {1.0, 1.0, 1.0, 2.0, 2.0, 2.0};

    GLfloat ctlpoints[S_NUMPOINTS][T_NUMPOINTS][4] = {
    {   {4.,2.,2.,1.},{4.,1.6,2.5,1.},{4.,2.,3.0,1.}    },
    {   {5.,4.,2.,1.},{5.,4.,2.5,1.},{5.,4.,3.0,1.} },
    {   {6.,5.,2.,1.},{6.,5.,2.5,1.},{6.,5.,3.0,1.} },
    {   {SQRT2*6.,SQRT2*6.,SQRT2*2.,SQRT2},
        {SQRT2*6.,SQRT2*6.,SQRT2*2.5,SQRT2},
        {SQRT2*6.,SQRT2*6.,SQRT2*3.0,SQRT2}  },
    {   {5.2,6.7,2.,1.},{5.2,6.7,2.5,1.},{5.2,6.7,3.0,1.}   },
    {   {SQRT2*4.,SQRT2*6.,SQRT2*2.,SQRT2},
        {SQRT2*4.,SQRT2*6.,SQRT2*2.5,SQRT2},
        {SQRT2*4.,SQRT2*6.,SQRT2*3.0,SQRT2}  },
    {   {4.,5.2,2.,1.},{4.,4.6,2.5,1.},{4.,5.2,3.0,1.}  },
    {   {SQRT2*4.,SQRT2*6.,SQRT2*2.,SQRT2},
        {SQRT2*4.,SQRT2*6.,SQRT2*2.5,SQRT2},
        {SQRT2*4.,SQRT2*6.,SQRT2*3.0,SQRT2}  },
    {   {2.8,6.7,2.,1.},{2.8,6.7,2.5,1.},{2.8,6.7,3.0,1.}   },
    {   {SQRT2*2.,SQRT2*6.,SQRT2*2.,SQRT2},
        {SQRT2*2.,SQRT2*6.,SQRT2*2.5,SQRT2},
        {SQRT2*2.,SQRT2*6.,SQRT2*3.0,SQRT2}  },
    {   {2.,5.,2.,1.},{2.,5.,2.5,1.},{2.,5.,3.0,1.} },
    {   {3.,4.,2.,1.},{3.,4.,2.5,1.},{3.,4.,3.0,1.} },
    {   {4.,2.,2.,1.},{4.,1.6,2.5,1.},{4.,2.,3.0,1.}    }
    };

    GLUnurbsObj *theNurb;

    /*  Initialize material property, light source, lighting model,
     *  and depth buffer.
     */
    void myinit(void)
    {
        GLfloat mat_ambient[] = { 1.0, 1.0, 1.0, 1.0 };
        GLfloat mat_diffuse[] = { 1.0, 0.2, 1.0, 1.0 };
        GLfloat mat_specular[] = { 1.0, 1.0, 1.0, 1.0 };
        GLfloat mat_shininess[] = { 50.0 };

        GLfloat light0_position[] = { 1.0, 0.1, 1.0, 0.0 };
        GLfloat light1_position[] = { -1.0, 0.1, 1.0, 0.0 };

        GLfloat lmodel_ambient[] = { 0.3, 0.3, 0.3, 1.0 };

        glMaterialfv(GL_FRONT, GL_AMBIENT, mat_ambient);
        glMaterialfv(GL_FRONT, GL_DIFFUSE, mat_diffuse);
        glMaterialfv(GL_FRONT, GL_SPECULAR, mat_specular);
        glMaterialfv(GL_FRONT, GL_SHININESS, mat_shininess);
        glLightfv(GL_LIGHT0, GL_POSITION, light0_position);
        glLightfv(GL_LIGHT1, GL_POSITION, light1_position);
        glLightModelfv(GL_LIGHT_MODEL_AMBIENT, lmodel_ambient);

        glEnable(GL_LIGHTING);
        glEnable(GL_LIGHT0);
        glEnable(GL_LIGHT1);
        glDepthFunc(GL_LESS);
        glEnable(GL_DEPTH_TEST);
        glEnable(GL_AUTO_NORMAL);

        theNurb = gluNewNurbsRenderer();

        gluNurbsProperty(theNurb, GLU_SAMPLING_TOLERANCE, 25.0);
        gluNurbsProperty(theNurb, GLU_DISPLAY_MODE, GLU_FILL);
    }

    void display(void)
    {
        glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

        glPushMatrix();
        glTranslatef (4., 4.5, 2.5);
        glRotatef (220.0, 1., 0., 0.);
        glRotatef (115.0, 0., 1., 0.);
        glTranslatef (-4., -4.5, -2.5);

        gluBeginSurface(theNurb);
        gluNurbsSurface(theNurb,
            S_NUMKNOTS, sknots,
            T_NUMKNOTS, tknots,
            4 * T_NUMPOINTS,
            4,
            &ctlpoints[0][0][0],
            S_ORDER, T_ORDER,
            GL_MAP2_VERTEX_4);
        gluEndSurface(theNurb);

        glPopMatrix();
        glFlush();
    }

    void myReshape(int w, int h)
    {
        glViewport(0, 0, w, h);
        glMatrixMode(GL_PROJECTION);
        glLoadIdentity();
        glFrustum(-1.0, 1.0, -1.5, 0.5, 0.8, 10.0);

        glMatrixMode(GL_MODELVIEW);
        glLoadIdentity();
        gluLookAt(7.0,4.5,4.0, 4.5,4.5,2.0, 6.0,-3.0,2.0);
    }

    static void
    key(unsigned char k, int x, int y)
    {
      switch (k) {
      case 27:  /* Escape */
        exit(0);
        break;
      default:
        return;
      }
      glutPostRedisplay();
    }

    /*  Main Loop
     *  Open window with initial window size, title bar,
     *  RGBA display mode, and handle input events.
     */
    int main(int argc, char** argv)
    {
        glutInit(&argc, argv);
        glutInitDisplayMode (GLUT_SINGLE | GLUT_RGB | GLUT_DEPTH);
        glutCreateWindow (argv[0]);
        myinit();
        glutReshapeFunc (myReshape);
        glutDisplayFunc(display);
        glutKeyboardFunc(key);
        glutMainLoop();
        return 0;             /* ANSI C requires main to return int. */
    }

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