*** viewing.c	Mon Oct 11 14:59:56 1993
--- viewing.c.frac	Mon Oct 11 14:46:03 1993
***************
*** 249,255 ****
  Pixel *color;		/* resulting color */
  int sample;		/* sample number */
  {
! 	Float dist;
  	HitList hitlist;
  	Color ctmp, fullintens;
  	extern void focus_blur_ray(), ShadeRay();
--- 249,255 ----
  Pixel *color;		/* resulting color */
  int sample;		/* sample number */
  {
! 	Float dist, temp;
  	HitList hitlist;
  	Color ctmp, fullintens;
  	extern void focus_blur_ray(), ShadeRay();
***************
*** 258,263 ****
--- 258,264 ----
  	 * Calculate ray direction.
  	 */
  	Stats.EyeRays++;
+         ray->type = EYE_RAY;
  	ray->dir.x = Screen.firstray.x + x*Screen.scrnx.x + y*Screen.scrny.x;
  	ray->dir.y = Screen.firstray.y + x*Screen.scrnx.y + y*Screen.scrny.y;
  	ray->dir.z = Screen.firstray.z + x*Screen.scrnx.z + y*Screen.scrny.z;
***************
*** 280,285 ****
--- 281,293 ----
  	fullintens.r = fullintens.g = fullintens.b = 1.;
  	dist = FAR_AWAY;
  	hitlist.nodes = 0;
+ 
+         ray->viewpoint = ray->pos;
+         ray->viewdist = 0.;
+         ray->width = 2.*tan(deg2rad(Camera.hfov/2.))/Screen.xres;
+         if ((temp = 2.*tan(deg2rad(Camera.vfov/2.))/Screen.yres) > ray->width) ray->width = temp;
+         ray->stretch = 1.;
+ 
  	(void)TraceRay(ray, &hitlist, EPSILON, &dist);
  	ShadeRay(&hitlist, ray, dist, &Screen.background, &ctmp, &fullintens);
  	color->r = ctmp.r;
***************
*** 291,293 ****
--- 299,321 ----
  		color->alpha = 0.;
  	}
  }
+ 
+ Float PixelSize(ray, dist)
+ Ray *ray;
+ Float dist;
+ {
+         Float s, d;
+ 
+         d = dist / ray->stretch;
+         if (ray->viewdist < EPSILON)	/* eye rays */ 
+                 s = ray->width * d;
+         else if (ray->viewdist < FAR_AWAY)   /* infinite light sources !! */
+                 s = ray->width / ray->viewdist * (d + ray->viewdist);
+ 	else 
+ 		s = ray->width;
+         s = fabs(s);
+         if (s < EPSILON) return EPSILON;
+ 
+         return s;
+ }
+