Function:ss2sl

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ss2sl

Set the entire lighting environment

Prototype

void ss2sl(COLOUR ambient, int nlights, XYZ *lightpos, COLOUR *lightcol, int worldcoords);

Description

Set the entire lighting environment. The nlights in the scene are at positions lightpos with colours lightcol, and ambient lighting colour. If worldcoords > 0 then the caller has given world coordinates, otherwise they are viewport-relative coordinates.

See Also

ns2i Illumination.
ns2vi Illumination - vector input.


Code Example

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

int main(int argc, char *argv[])
{
   COLOUR ambient = { 0.1, 0.0, 0.1 };		/* Ambient colour */
   int nlights = 1;				/* 1 light */
   XYZ *light;					/* Positions of lights */
   COLOUR *lcol;				/* Colours of lights */
   int wc = 1;					/* Use world coordinates */
   int i;					/* Loop variable */

   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 */

   light = (XYZ *)   calloc(nlights, sizeof(XYZ));	/* Allocate memory */
   lcol  = (COLOUR *)calloc(nlights, sizeof(COLOUR));	/* Allocate memory */

   for (i=0;i<nlights;i++) {
      light[i].x = drand48()*2.0 - 1.0;	/* Random light position */
      light[i].y = drand48()*2.0 - 1.0;	
      light[i].z = drand48()*2.0 - 1.0;	
      lcol[i].r  = drand48();			/* Random colour */
      lcol[i].g  = 1.0;
      lcol[i].b  = drand48();			
      ns2vthpoint(light[i], lcol[i], 4);	/* Draw point where light is */
   }

   ns2sphere(0.0,0.0,0.0, 0.3, 1.0,1.0,1.0);	/* Draw a "white" sphere */

   ss2sl(ambient, nlights, light, lcol, wc); 	/* Turn on the lights */

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

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