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greg |
2.1 |
#ifndef lint |
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greg |
2.5 |
static const char RCSid[] = "$Id$"; |
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greg |
2.1 |
#endif |
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/* |
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* Draw small sources into image in case we missed them. |
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greg |
2.5 |
* |
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* External symbols declared in ray.h |
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*/ |
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greg |
2.6 |
#include "copyright.h" |
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greg |
2.1 |
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#include "ray.h" |
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#include "view.h" |
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#include "source.h" |
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#define CLIP_ABOVE 1 |
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#define CLIP_BELOW 2 |
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#define CLIP_RIGHT 3 |
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#define CLIP_LEFT 4 |
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#define MAXVERT 10 |
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greg |
2.3 |
typedef struct splist { |
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struct splist *next; /* next source in list */ |
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int sn; /* source number */ |
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short nv; /* number of vertices */ |
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FLOAT vl[3][2]; /* vertex array (last) */ |
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} SPLIST; /* source polygon list */ |
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greg |
2.1 |
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33 |
greg |
2.3 |
extern VIEW ourview; /* our view parameters */ |
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extern int hres, vres; /* our image resolution */ |
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static SPLIST *sphead = NULL; /* our list of source polys */ |
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greg |
2.1 |
static int |
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inregion(p, cv, crit) /* check if vertex is in region */ |
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FLOAT p[2]; |
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double cv; |
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int crit; |
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{ |
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switch (crit) { |
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case CLIP_ABOVE: |
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return(p[1] < cv); |
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case CLIP_BELOW: |
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return(p[1] >= cv); |
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case CLIP_RIGHT: |
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return(p[0] < cv); |
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case CLIP_LEFT: |
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return(p[0] >= cv); |
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} |
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return(-1); |
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} |
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static |
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clipregion(a, b, cv, crit, r) /* find intersection with boundary */ |
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register FLOAT a[2], b[2]; |
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double cv; |
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int crit; |
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FLOAT r[2]; /* return value */ |
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{ |
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switch (crit) { |
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case CLIP_ABOVE: |
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case CLIP_BELOW: |
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r[1] = cv; |
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r[0] = a[0] + (cv-a[1])/(b[1]-a[1])*(b[0]-a[0]); |
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return; |
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case CLIP_RIGHT: |
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case CLIP_LEFT: |
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r[0] = cv; |
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r[1] = a[1] + (cv-a[0])/(b[0]-a[0])*(b[1]-a[1]); |
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return; |
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} |
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} |
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static int |
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hp_clip_poly(vl, nv, cv, crit, vlo) /* clip polygon to half-plane */ |
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FLOAT vl[][2]; |
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int nv; |
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double cv; |
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int crit; |
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FLOAT vlo[][2]; /* return value */ |
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{ |
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FLOAT *s, *p; |
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register int j, nvo; |
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s = vl[nv-1]; |
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nvo = 0; |
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for (j = 0; j < nv; j++) { |
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p = vl[j]; |
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if (inregion(p, cv, crit)) { |
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if (!inregion(s, cv, crit)) |
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clipregion(s, p, cv, crit, vlo[nvo++]); |
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vlo[nvo][0] = p[0]; vlo[nvo++][1] = p[1]; |
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} else if (inregion(s, cv, crit)) |
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clipregion(s, p, cv, crit, vlo[nvo++]); |
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s = p; |
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} |
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return(nvo); |
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} |
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static int |
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box_clip_poly(vl, nv, xl, xr, yb, ya, vlo) /* clip polygon to box */ |
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FLOAT vl[MAXVERT][2]; |
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int nv; |
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double xl, xr, yb, ya; |
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FLOAT vlo[MAXVERT][2]; /* return value */ |
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{ |
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FLOAT vlt[MAXVERT][2]; |
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int nvt, nvo; |
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117 |
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nvt = hp_clip_poly(vl, nv, yb, CLIP_BELOW, vlt); |
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nvo = hp_clip_poly(vlt, nvt, ya, CLIP_ABOVE, vlo); |
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nvt = hp_clip_poly(vlo, nvo, xl, CLIP_LEFT, vlt); |
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nvo = hp_clip_poly(vlt, nvt, xr, CLIP_RIGHT, vlo); |
121 |
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122 |
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return(nvo); |
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} |
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static double |
127 |
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minw2(vl, nv, ar2) /* compute square of minimum width */ |
128 |
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FLOAT vl[][2]; |
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int nv; |
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double ar2; |
131 |
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{ |
132 |
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double d2, w2, w2min, w2max; |
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register FLOAT *p0, *p1, *p2; |
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int i, j; |
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/* find minimum for all widths */ |
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w2min = FHUGE; |
137 |
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p0 = vl[nv-1]; |
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for (i = 0; i < nv; i++) { /* for each edge */ |
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p1 = vl[i]; |
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d2 = (p1[0]-p0[0])*(p1[0]-p0[0]) + |
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(p1[1]-p0[1])*(p1[1]-p0[1])*ar2; |
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w2max = 0.; /* find maximum for this side */ |
143 |
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for (j = 1; j < nv-1; j++) { |
144 |
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p2 = vl[(i+j)%nv]; |
145 |
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w2 = (p1[0]-p0[0])*(p2[1]-p0[1]) - |
146 |
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(p1[1]-p0[1])*(p2[0]-p0[0]); |
147 |
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w2 = w2*w2*ar2/d2; /* triangle height squared */ |
148 |
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if (w2 > w2max) |
149 |
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w2max = w2; |
150 |
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} |
151 |
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if (w2max < w2min) /* global min. based on local max.'s */ |
152 |
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w2min = w2max; |
153 |
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p0 = p1; |
154 |
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} |
155 |
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return(w2min); |
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} |
157 |
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158 |
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159 |
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static |
160 |
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convex_center(vl, nv, cv) /* compute center of convex polygon */ |
161 |
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register FLOAT vl[][2]; |
162 |
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int nv; |
163 |
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FLOAT cv[2]; /* return value */ |
164 |
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{ |
165 |
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register int i; |
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/* simple average (suboptimal) */ |
167 |
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cv[0] = cv[1] = 0.; |
168 |
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for (i = 0; i < nv; i++) { |
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cv[0] += vl[i][0]; |
170 |
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cv[1] += vl[i][1]; |
171 |
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} |
172 |
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cv[0] /= (double)nv; |
173 |
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cv[1] /= (double)nv; |
174 |
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} |
175 |
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176 |
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177 |
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static double |
178 |
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poly_area(vl, nv) /* compute area of polygon */ |
179 |
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register FLOAT vl[][2]; |
180 |
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int nv; |
181 |
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{ |
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double a; |
183 |
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FLOAT v0[2], v1[2]; |
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register int i; |
185 |
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186 |
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a = 0.; |
187 |
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v0[0] = vl[1][0] - vl[0][0]; |
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v0[1] = vl[1][1] - vl[0][1]; |
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for (i = 2; i < nv; i++) { |
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v1[0] = vl[i][0] - vl[0][0]; |
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v1[1] = vl[i][1] - vl[0][1]; |
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a += v0[0]*v1[1] - v0[1]*v1[0]; |
193 |
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v0[0] = v1[0]; v0[1] = v1[1]; |
194 |
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} |
195 |
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return(a * (a >= 0. ? .5 : -.5)); |
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} |
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198 |
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199 |
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static int |
200 |
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convex_hull(vl, nv, vlo) /* compute polygon's convex hull */ |
201 |
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FLOAT vl[][2]; |
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int nv; |
203 |
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FLOAT vlo[][2]; /* return value */ |
204 |
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{ |
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int nvo, nvt; |
206 |
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FLOAT vlt[MAXVERT][2]; |
207 |
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double voa, vta; |
208 |
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register int i, j; |
209 |
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/* start with original polygon */ |
210 |
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for (i = nvo = nv; i--; ) { |
211 |
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vlo[i][0] = vl[i][0]; vlo[i][1] = vl[i][1]; |
212 |
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} |
213 |
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voa = poly_area(vlo, nvo); /* compute its area */ |
214 |
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for (i = 0; i < nvo; i++) { /* for each output vertex */ |
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for (j = 0; j < i; j++) { |
216 |
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vlt[j][0] = vlo[j][0]; vlt[j][1] = vlo[j][1]; |
217 |
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} |
218 |
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nvt = nvo - 1; /* make poly w/o vertex */ |
219 |
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for (j = i; j < nvt; j++) { |
220 |
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vlt[j][0] = vlo[j+1][0]; vlt[j][1] = vlo[j+1][1]; |
221 |
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} |
222 |
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vta = poly_area(vlt, nvt); |
223 |
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if (vta >= voa) { /* is simpler poly bigger? */ |
224 |
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voa = vta; /* then use it */ |
225 |
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for (j = nvo = nvt; j--; ) { |
226 |
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vlo[j][0] = vlt[j][0]; vlo[j][1] = vlt[j][1]; |
227 |
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} |
228 |
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i--; /* next adjust */ |
229 |
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} |
230 |
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} |
231 |
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return(nvo); |
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} |
233 |
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234 |
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235 |
greg |
2.3 |
static |
236 |
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spinsert(sn, vl, nv) /* insert new source polygon */ |
237 |
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int sn; |
238 |
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FLOAT vl[][2]; |
239 |
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int nv; |
240 |
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{ |
241 |
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register SPLIST *spn; |
242 |
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register int i; |
243 |
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244 |
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if (nv < 3) |
245 |
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return; |
246 |
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if (nv > 3) |
247 |
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spn = (SPLIST *)malloc(sizeof(SPLIST)+sizeof(FLOAT)*2*(nv-3)); |
248 |
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else |
249 |
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spn = (SPLIST *)malloc(sizeof(SPLIST)); |
250 |
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if (spn == NULL) |
251 |
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error(SYSTEM, "out of memory in spinsert"); |
252 |
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spn->sn = sn; |
253 |
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for (i = spn->nv = nv; i--; ) { |
254 |
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spn->vl[i][0] = vl[i][0]; spn->vl[i][1] = vl[i][1]; |
255 |
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} |
256 |
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spn->next = sphead; /* push onto global list */ |
257 |
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sphead = spn; |
258 |
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} |
259 |
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260 |
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261 |
greg |
2.1 |
int |
262 |
greg |
2.3 |
sourcepoly(sn, sp) /* compute image polygon for source */ |
263 |
greg |
2.1 |
int sn; |
264 |
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FLOAT sp[MAXVERT][2]; |
265 |
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{ |
266 |
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static char cubeord[8][6] = {{1,3,2,6,4,5},{0,4,5,7,3,2}, |
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{0,1,3,7,6,4},{0,1,5,7,6,2}, |
268 |
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{0,2,6,7,5,1},{0,4,6,7,3,1}, |
269 |
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{0,2,3,7,5,4},{1,5,4,6,2,3}}; |
270 |
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register SRCREC *s = source + sn; |
271 |
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FVECT ap, ip; |
272 |
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FLOAT pt[6][2]; |
273 |
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int dir; |
274 |
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register int i, j; |
275 |
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276 |
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if (s->sflags & (SDISTANT|SFLAT)) { |
277 |
greg |
2.3 |
if (s->sflags & SDISTANT && ourview.type == VT_PAR) |
278 |
greg |
2.1 |
return(0); /* all or nothing case */ |
279 |
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if (s->sflags & SFLAT) { |
280 |
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for (i = 0; i < 3; i++) |
281 |
greg |
2.3 |
ap[i] = s->sloc[i] - ourview.vp[i]; |
282 |
greg |
2.1 |
if (DOT(ap, s->snorm) >= 0.) |
283 |
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return(0); /* source faces away */ |
284 |
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} |
285 |
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for (j = 0; j < 4; j++) { /* four corners */ |
286 |
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for (i = 0; i < 3; i++) { |
287 |
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ap[i] = s->sloc[i]; |
288 |
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if (j==1|j==2) ap[i] += s->ss[SU][i]; |
289 |
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else ap[i] -= s->ss[SU][i]; |
290 |
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if (j==2|j==3) ap[i] += s->ss[SV][i]; |
291 |
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else ap[i] -= s->ss[SV][i]; |
292 |
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if (s->sflags & SDISTANT) { |
293 |
greg |
2.3 |
ap[i] *= 1. + ourview.vfore; |
294 |
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ap[i] += ourview.vp[i]; |
295 |
greg |
2.1 |
} |
296 |
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} |
297 |
greg |
2.3 |
viewloc(ip, &ourview, ap); /* find image point */ |
298 |
greg |
2.1 |
if (ip[2] <= 0.) |
299 |
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return(0); /* in front of view */ |
300 |
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sp[j][0] = ip[0]; sp[j][1] = ip[1]; |
301 |
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} |
302 |
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return(4); |
303 |
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} |
304 |
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/* identify furthest corner */ |
305 |
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for (i = 0; i < 3; i++) |
306 |
greg |
2.3 |
ap[i] = s->sloc[i] - ourview.vp[i]; |
307 |
greg |
2.1 |
dir = (DOT(ap,s->ss[SU])>0.) | |
308 |
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(DOT(ap,s->ss[SV])>0.)<<1 | |
309 |
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(DOT(ap,s->ss[SW])>0.)<<2 ; |
310 |
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/* order vertices based on this */ |
311 |
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for (j = 0; j < 6; j++) { |
312 |
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for (i = 0; i < 3; i++) { |
313 |
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ap[i] = s->sloc[i]; |
314 |
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if (cubeord[dir][j] & 1) ap[i] += s->ss[SU][i]; |
315 |
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else ap[i] -= s->ss[SU][i]; |
316 |
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if (cubeord[dir][j] & 2) ap[i] += s->ss[SV][i]; |
317 |
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else ap[i] -= s->ss[SV][i]; |
318 |
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if (cubeord[dir][j] & 4) ap[i] += s->ss[SW][i]; |
319 |
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else ap[i] -= s->ss[SW][i]; |
320 |
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} |
321 |
greg |
2.3 |
viewloc(ip, &ourview, ap); /* find image point */ |
322 |
greg |
2.1 |
if (ip[2] <= 0.) |
323 |
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return(0); /* in front of view */ |
324 |
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pt[j][0] = ip[0]; pt[j][1] = ip[1]; |
325 |
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} |
326 |
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return(convex_hull(pt, 6, sp)); /* make sure it's convex */ |
327 |
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} |
328 |
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329 |
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330 |
greg |
2.3 |
/* initialize by finding sources smaller than rad */ |
331 |
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init_drawsources(rad) |
332 |
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int rad; /* source sample size */ |
333 |
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{ |
334 |
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FLOAT spoly[MAXVERT][2]; |
335 |
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int nsv; |
336 |
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register SPLIST *sp; |
337 |
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register int i; |
338 |
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/* free old source list if one */ |
339 |
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for (sp = sphead; sp != NULL; sp = sphead) { |
340 |
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sphead = sp->next; |
341 |
greg |
2.5 |
free((void *)sp); |
342 |
greg |
2.3 |
} |
343 |
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/* loop through all sources */ |
344 |
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for (i = nsources; i--; ) { |
345 |
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/* compute image polygon for source */ |
346 |
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if (!(nsv = sourcepoly(i, spoly))) |
347 |
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continue; |
348 |
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/* clip to image boundaries */ |
349 |
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if (!(nsv = box_clip_poly(spoly, nsv, 0., 1., 0., 1., spoly))) |
350 |
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continue; |
351 |
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/* big enough for standard sampling? */ |
352 |
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if (minw2(spoly, nsv, ourview.vn2/ourview.hn2) > |
353 |
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(double)rad*rad/hres/hres) |
354 |
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continue; |
355 |
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/* OK, add to our list */ |
356 |
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spinsert(i, spoly, nsv); |
357 |
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} |
358 |
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} |
359 |
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|
360 |
greg |
2.5 |
void /* add sources smaller than rad to computed subimage */ |
361 |
greg |
2.3 |
drawsources(pic, zbf, x0, xsiz, y0, ysiz) |
362 |
greg |
2.1 |
COLOR *pic[]; /* subimage pixel value array */ |
363 |
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float *zbf[]; /* subimage distance array (opt.) */ |
364 |
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int x0, xsiz, y0, ysiz; /* origin and size of subimage */ |
365 |
|
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{ |
366 |
|
|
FLOAT spoly[MAXVERT][2], ppoly[MAXVERT][2]; |
367 |
|
|
int nsv, npv; |
368 |
greg |
2.3 |
int xmin, xmax, ymin, ymax, x, y; |
369 |
greg |
2.1 |
FLOAT cxy[2]; |
370 |
gregl |
2.4 |
double w; |
371 |
greg |
2.1 |
RAY sr; |
372 |
greg |
2.3 |
register SPLIST *sp; |
373 |
|
|
register int i; |
374 |
|
|
/* check each source in our list */ |
375 |
|
|
for (sp = sphead; sp != NULL; sp = sp->next) { |
376 |
greg |
2.1 |
/* clip source poly to subimage */ |
377 |
greg |
2.3 |
nsv = box_clip_poly(sp->vl, sp->nv, |
378 |
|
|
(double)x0/hres, (double)(x0+xsiz)/hres, |
379 |
|
|
(double)y0/vres, (double)(y0+ysiz)/vres, spoly); |
380 |
greg |
2.1 |
if (!nsv) |
381 |
|
|
continue; |
382 |
|
|
/* find common subimage (BBox) */ |
383 |
|
|
xmin = x0 + xsiz; xmax = x0; |
384 |
|
|
ymin = y0 + ysiz; ymax = y0; |
385 |
|
|
for (i = 0; i < nsv; i++) { |
386 |
greg |
2.3 |
if ((double)xmin/hres > spoly[i][0]) |
387 |
|
|
xmin = spoly[i][0]*hres + FTINY; |
388 |
|
|
if ((double)xmax/hres < spoly[i][0]) |
389 |
|
|
xmax = spoly[i][0]*hres - FTINY; |
390 |
|
|
if ((double)ymin/vres > spoly[i][1]) |
391 |
|
|
ymin = spoly[i][1]*vres + FTINY; |
392 |
|
|
if ((double)ymax/vres < spoly[i][1]) |
393 |
|
|
ymax = spoly[i][1]*vres - FTINY; |
394 |
greg |
2.1 |
} |
395 |
|
|
/* evaluate each pixel in BBox */ |
396 |
|
|
for (y = ymin; y <= ymax; y++) |
397 |
|
|
for (x = xmin; x <= xmax; x++) { |
398 |
|
|
/* subarea for pixel */ |
399 |
|
|
npv = box_clip_poly(spoly, nsv, |
400 |
greg |
2.3 |
(double)x/hres, (x+1.)/hres, |
401 |
|
|
(double)y/vres, (y+1.)/vres, |
402 |
|
|
ppoly); |
403 |
greg |
2.1 |
if (!npv) |
404 |
|
|
continue; /* no overlap */ |
405 |
|
|
convex_center(ppoly, npv, cxy); |
406 |
greg |
2.3 |
if ((sr.rmax = viewray(sr.rorg,sr.rdir,&ourview, |
407 |
|
|
cxy[0],cxy[1])) < -FTINY) |
408 |
greg |
2.1 |
continue; /* not in view */ |
409 |
greg |
2.3 |
if (source[sp->sn].sflags & SSPOT && |
410 |
|
|
spotout(&sr, source[sp->sn].sl.s)) |
411 |
greg |
2.1 |
continue; /* outside spot */ |
412 |
|
|
rayorigin(&sr, NULL, SHADOW, 1.0); |
413 |
greg |
2.3 |
sr.rsrc = sp->sn; |
414 |
greg |
2.1 |
rayvalue(&sr); /* compute value */ |
415 |
|
|
if (bright(sr.rcol) <= FTINY) |
416 |
|
|
continue; /* missed/blocked */ |
417 |
|
|
/* modify pixel */ |
418 |
|
|
if (zbf[y-y0] != NULL && |
419 |
gregl |
2.4 |
sr.rt < 0.999*zbf[y-y0][x-x0]) |
420 |
greg |
2.1 |
zbf[y-y0][x-x0] = sr.rt; |
421 |
gregl |
2.4 |
else if (!bigdiff(sr.rcol, pic[y-y0][x-x0], |
422 |
|
|
0.001)) /* source sample */ |
423 |
|
|
setcolor(pic[y-y0][x-x0], 0., 0., 0.); |
424 |
|
|
w = poly_area(ppoly, npv) * hres * vres; |
425 |
|
|
scalecolor(sr.rcol, w); |
426 |
|
|
scalecolor(pic[y-y0][x-x0], 1.-w); |
427 |
greg |
2.1 |
addcolor(pic[y-y0][x-x0], sr.rcol); |
428 |
|
|
} |
429 |
|
|
} |
430 |
|
|
} |