sneeker
1d7ad86fb7
A C++ consumer of the C archives, plus maths, scene and image tests driven by meowc test.
51 lines
1.8 KiB
C
51 lines
1.8 KiB
C
#include "rt_scene.h"
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#include "studio_scene.h"
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#include <math.h>
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#include <stdio.h>
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static int failures = 0;
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static void check(const char *what, int cond) {
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if (!cond) {
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fprintf(stderr, " %s: failed\n", what);
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failures++;
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}
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}
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int main(void) {
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check("the generated scene has spheres", studio_sphere_count > 0);
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/* One unit sphere at the origin, hit straight down the -z axis. */
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static const sphere one[] = {{{0, 0, 0}, 1.0, {MAT_LAMBERT, {0.5, 0.5, 0.5}, 0.0}}};
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scene sc = {one, 1, {0, 0, 0}};
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ray r = {{0, 0, 5}, {0, 0, -1}};
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hit h;
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check("a ray aimed at the sphere hits it", scene_hit(&sc, r, 1e-4, 1e30, &h));
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check("it hits the near face", fabs(h.t - 4.0) < 1e-9);
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check("the normal faces the ray", fabs(h.normal.z - 1.0) < 1e-9);
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check("the hit is on the outside", h.front == 1);
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ray miss = {{0, 5, 5}, {0, 0, -1}};
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check("a ray that passes above misses", !scene_hit(&sc, miss, 1e-4, 1e30, &h));
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/* Starting inside, the first crossing is the far wall. */
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ray inside = {{0, 0, 0}, {0, 0, -1}};
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check("a ray from the centre still hits", scene_hit(&sc, inside, 1e-4, 1e30, &h));
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check("and reports the inside face", h.front == 0);
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/* The interval bounds are respected. */
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check("a hit beyond tmax is rejected", !scene_hit(&sc, r, 1e-4, 1.0, &h));
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/* Nearest sphere wins when two overlap the ray. */
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static const sphere two[] = {
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{{0, 0, 0}, 1.0, {MAT_LAMBERT, {1, 0, 0}, 0.0}},
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{{0, 0, 2.5}, 0.5, {MAT_METAL, {0, 1, 0}, 0.0}},
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};
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scene both = {two, 2, {0, 0, 0}};
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check("the closer sphere is chosen", scene_hit(&both, r, 1e-4, 1e30, &h) && h.mat.kind == MAT_METAL);
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if (failures == 0) printf(" scene: every assertion held\n");
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return failures == 0 ? 0 : 1;
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}
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