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diffuse skylight

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Anton Ljungdahl 2025-04-25 23:47:57 +02:00
parent 10aa24acbe
commit 3e41274f45
2 changed files with 15 additions and 6 deletions
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21
src/main.cu
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@ -488,10 +488,10 @@ get_sample_color(RayF32 ray, Entity *entities, curandState *local_rand_state)
Vec3F32 out = {0}; Vec3F32 out = {0};
F32 current_attenuation = 1.0f; F32 current_attenuation = 1.0f;
F32 attenuation_factor = 0.5f;
Vec3F32 sample_pixel_color = vec3F32(0.0f, 0.0f, 0.0f); Vec3F32 sample_pixel_color = vec3F32(0.0f, 0.0f, 0.0f);
for(U32 bounce_idx = 0; for(U32 bounce_idx = 0;
//bounce_idx < MAX_DIFFUSE_DEPTH; bounce_idx < MAX_DIFFUSE_DEPTH;
bounce_idx < 1;
bounce_idx += 1) bounce_idx += 1)
{ {
@ -524,14 +524,18 @@ get_sample_color(RayF32 ray, Entity *entities, curandState *local_rand_state)
if(hit_rec.hit) if(hit_rec.hit)
{ {
// Paint entity // "Paint entity"
// For a diffuse color we actually just update the attenuation here and
// bounce rays around... Then when we are not hitting anything anymore we will sample
// the background gradient and use the computed attenuation. Since the rays are
// bouncing diffusely this will shade nicely.
Vec3F32 rand_dir = rand_unit_vector_on_hemisphere_F32(local_rand_state, hit_rec.normal); Vec3F32 rand_dir = rand_unit_vector_on_hemisphere_F32(local_rand_state, hit_rec.normal);
current_attenuation = current_attenuation * 0.5f; current_attenuation = current_attenuation * attenuation_factor;
current_ray.origin = hit_rec.point; current_ray.origin = hit_rec.point;
current_ray.direction = rand_dir; current_ray.direction = rand_dir;
sample_pixel_color = add_V3F32(hit_rec.normal, vec3F32(1.0f, 1.0f, 1.0f)); //sample_pixel_color = add_V3F32(hit_rec.normal, vec3F32(1.0f, 1.0f, 1.0f));
sample_pixel_color = scale_V3F32(0.5f, sample_pixel_color); //sample_pixel_color = scale_V3F32(0.5f, sample_pixel_color);
// debug // debug
//sample_pixel_color = vec3F32(1.0f, 0.0f, 0.0f); //sample_pixel_color = vec3F32(1.0f, 0.0f, 0.0f);
} }
@ -547,6 +551,7 @@ get_sample_color(RayF32 ray, Entity *entities, curandState *local_rand_state)
F32 blend = 0.5f*(unit_dir.y + 1.0f); F32 blend = 0.5f*(unit_dir.y + 1.0f);
sample_pixel_color = lerp_V3F32(blend, white, light_blue); sample_pixel_color = lerp_V3F32(blend, white, light_blue);
// Scale by the current attenuation for diffuse shading using background color
sample_pixel_color = scale_V3F32(current_attenuation, sample_pixel_color); sample_pixel_color = scale_V3F32(current_attenuation, sample_pixel_color);
break; break;
} }
@ -568,7 +573,11 @@ cuda_main(Entity *entities, Vec3F32 *pixelbuffer, curandState *rand_state)
if(x < image.width && y < image.height) if(x < image.width && y < image.height)
{ {
// NOTE! We need to pass this as a pointer to subsequent usage functions, in order
// to update the random state on this thread, after each call to a distribution function.
curandState local_rand_state = rand_state[idx]; curandState local_rand_state = rand_state[idx];
// We are adding all samples and then dividing by num samples to get the mean, so // We are adding all samples and then dividing by num samples to get the mean, so
// we initialise the color for this pixel to black. // we initialise the color for this pixel to black.
// Loop over all pixel samples // Loop over all pixel samples

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timeBuild.ctm
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