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Allow negative sky colour to be specified

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This commit is contained in:
Camden Dixie O'Brien
2025-09-23 14:19:30 +01:00
parent a8c69c2386
commit 53198edaa4
4 changed files with 11 additions and 6 deletions
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6
demo.c
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@@ -16,7 +16,8 @@
static const vec3_t camera_pos = { 80.0, 30.0, 60.0 };
static const vec3_t target = { 0.0, 0.0, 10.0 };
static const vec3_t sky = { 0.6, 0.8, 1.0 };
static const vec3_t sky_pos = { 0.6, 0.8, 1.0 };
static const vec3_t sky_neg = { 1.0, 1.0, 1.0 };
static const material_t floor = LAMBERTIAN(1.0, 0.94, 0.80);
static const material_t light = AREA_LIGHT(1.0, 0.8, 0.5, 4.0);
@@ -43,7 +44,8 @@ int main()
= camera_init(camera_pos, target, FOV, W, H, APERTURE, FOCAL_LEN);
const scene_t scene = {
.sky_colour = sky,
.sky_pos = sky_pos,
.sky_neg = sky_neg,
.objs = objs,
.obj_count = NELEMS(objs),
};

2
include/scene.h
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@@ -4,7 +4,7 @@
#include "obj.h"
typedef struct {
vec3_t sky_colour;
vec3_t sky_pos, sky_neg;
obj_t *objs;
unsigned obj_count;
} scene_t;

6
rand.c
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@@ -22,7 +22,8 @@
static const vec3_t camera_pos = { -100.0, 30.0, -100.0 };
static const vec3_t target = { 0.0, 0.0, 0.0 };
static const vec3_t sky = { 0.6, 0.8, 1.0 };
static const vec3_t sky_pos = { 0.6, 0.8, 1.0 };
static const vec3_t sky_neg = { 1.0, 1.0, 1.0 };
static const material_t floor = LAMBERTIAN(1.0, 0.94, 0.80);
static const material_t light = AREA_LIGHT(1.0, 0.8, 0.1, 4.0);
@@ -72,7 +73,8 @@ int main()
= camera_init(camera_pos, target, FOV, W, H, APERTURE, FOCAL_LEN);
const scene_t scene = {
.sky_colour = sky,
.sky_pos = sky_pos,
.sky_neg = sky_neg,
.objs = objs,
.obj_count = OBJ_COUNT,
};

3
src/render.c
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@@ -45,7 +45,8 @@ static vec3_t trace(ray_t ray, const scene_t *scene, rng_t *rng)
if (hit.t == DBL_MAX) {
const double a = (ray.dir.y + 1.0) / 2.0;
const vec3_t bg = vec3_add(
vec3_scale(scene->sky_colour, a), vec3_scale(white, 1 - a));
vec3_scale(scene->sky_pos, a),
vec3_scale(scene->sky_neg, 1 - a));
return vec3_hadamard(colour, bg);
}