Function:ns2vf4nc

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ns2vf4nc

4-vertex facet with coloured vertices and normals given.

Prototype

void ns2vf4nc(XYZ *P, XYZ *N, COLOUR *col);

Description

The most general function for drawing a 4-vertex facet with coloured vertices. The vertices are given by the array P, normals are in the array N, and the RGB colours for vertices are in col. The other 4-vertex functions call this function.

See Also

ns2vf4 4-vertex facet with single colour and automatic normals.
ns2vf4n 4-vertex facet with single colour and normals given.
ns2vf4c 4-vertex facet with coloured vertices and automatic normals.
ns2vf4t Textured 4-vertex facet, scale in [0,1]; trans = 'o' or 't'.
struct_COLOUR Data structure for (r,g,b) colour indices.
struct_XYZ Data structure for (x,y,z) coordinates.


Code Example

#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include "s2plot.h"

int main(int argc, char *argv[])
{
   XYZ vertex[4];				/* 4 vertices */
   XYZ normal[4];				/* Normals */
   COLOUR col[4];				/* Colours */
   int i;

   srand48((long)time(NULL));			/* Seed random numbers */
   s2opend("/?",argc, argv);			/* Open the display */
   s2swin(-1.,1., -1.,1., -1.,1.);		/* Set the window coordinates */
   s2box("BCDET",0,0,"BCDET",0,0,"BCDET",0,0);	/* Draw coordinate box */

   vertex[0].x = 0.0; vertex[0].y =  0.0; vertex[0].z = 0.0;
   vertex[1].x = 0.5; vertex[1].y =  0.0; vertex[1].z = 0.0;
   vertex[2].x = 0.5; vertex[2].y = -0.4; vertex[2].z = 1.0;
   vertex[3].x = 0.0; vertex[3].y = -0.4; vertex[3].z = 1.0;

   for (i=0;i<4;i++) {
      normal[i].x = drand48()*2.0 - 1.0;
      normal[i].y = drand48()*2.0 - 1.0;
      normal[i].z = drand48()*2.0 - 1.0;
      col[i].r    = drand48();
      col[i].g    = drand48();
      col[i].b    = drand48();
   }

   ns2vf4nc(vertex, normal, col);         	/* Draw the polygon */

   s2show(1);					/* Open the s2plot window */
   
   return 1;
}

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