diff options
Diffstat (limited to 'src/main.c')
| -rw-r--r-- | src/main.c | 31 |
1 files changed, 29 insertions, 2 deletions
@@ -6,6 +6,8 @@ #include "vecmath.h" #include "picture.h" +#define EPSILON 0.001 + typedef enum { kAmbientLight, kPointLight, @@ -99,6 +101,29 @@ float ball_intersect(Vec3f start, Vec3f ray, Ball *ball) { return t1 < t2 ? t1 : t2; } +bool is_in_shadow(Vec3f pos, Light light) { + Vec3f ray; + if (light.type == kPointLight) { + ray = vec3f_sub(light.vec, pos); + } else if (light.type == kDirectionalLight) { + ray = light.vec; + } else { + return false; + } + float tmin = FLT_MAX; + for (int i = 0; i < sizeof(balls) / sizeof(Ball); i++) { + float t = ball_intersect(pos, ray, &balls[i]); + if (t > EPSILON && t < tmin) tmin = t; + } + if (light.type == kPointLight) { + return tmin < 1; + } + if (light.type == kDirectionalLight) { + return tmin != FLT_MAX; + } + return false; +} + float specular_coeff(Vec3f l, Vec3f n, Vec3f v, float s) { Vec3f r = vec3f_sub(vec3f_mul(2 * vec3f_dot(n, l), n), l); v = vec3f_normalize(v); @@ -115,6 +140,7 @@ Color ball_surface_color(Ball *ball, Vec3f point, Vec3f view) { if (lights[i].type == kAmbientLight) { amp += lights[i].intensity; } else if (lights[i].type == kPointLight) { + if (is_in_shadow(point, lights[i])) continue; Vec3f l = vec3f_normalize(vec3f_sub(lights[i].vec, point)); float prod = vec3f_dot(l, norm); if (prod > 0) amp += prod * lights[i].intensity; @@ -123,6 +149,7 @@ Color ball_surface_color(Ball *ball, Vec3f point, Vec3f view) { * lights[i].intensity; } } else if (lights[i].type == kDirectionalLight) { + if (is_in_shadow(point, lights[i])) continue; Vec3f l = vec3f_normalize(lights[i].vec); float prod = vec3f_dot(l, norm); if (prod > 0) amp += prod * lights[i].intensity; @@ -164,8 +191,8 @@ Color calc_color(Vec3f v) { int main() { init_color(); - int img_w = 1280*2; - int img_h = 720*2; + int img_w = 800*2; + int img_h = 800*2; Picture pic = new_picture(img_w, img_h); for (int x = 0; x < img_w; x++) { for (int y = 0; y < img_h; y++) { |