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libgarbage: fix depth in reflections when using LIMIT_DEPTH_TO_MESH; fix flickering when camera is inside volume

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Crispy 2023-07-26 18:25:45 +02:00
parent 299cf8ff32
commit 5cb5dcd785
1 changed files with 17 additions and 9 deletions
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26
Assets/raymarched/lib/libgarbage.cginc
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@ -26,6 +26,11 @@ START_RAYS_IN_BOX // TODO: implement
START_RAYS_IN_SPHERE // TODO: implement
*/
// sky used as background unless DISCARD_ON_MISS is set, and used in reflections
// TODO: implement
#ifndef SKY_FN
#define SKY_FN default_sky
#endif
// scene sdf that includes material data
#ifndef SCENE_FN
@ -159,15 +164,14 @@ FragOut frag (V2F i) {
float ray_len = 0;
float3 ray_dir = normalize(i.hit_pos - i.cam_pos);
float3 ray_origin = i.cam_pos;
ray_origin /= SCENE_SCALE;
SurfacePoint point_data;
float3 ray_origin = i.cam_pos / SCENE_SCALE;
Ray ray;
float3 col;
float color_used = 0;// what amount of the final color has been calculated
float prev_gloss = 0;
float3 first_hit;
bool inside_shape;
int ray_num = 0;
for (; ray_num < REFLECTIONS + 1;) {
@ -175,10 +179,7 @@ FragOut frag (V2F i) {
if (ray_num == 0) { // before any bounces
col = LIGHT_FN(ray);
first_hit = ray.hit_pos;
if (ray.steps == 0) {
// discard;
// TODO: sky fn
}
inside_shape = ray.steps == 0;
} else {
float col_amount = color_used + ((1 - prev_gloss) * (1 - color_used));
col = lerp(LIGHT_FN(ray), col, col_amount);
@ -206,10 +207,14 @@ FragOut frag (V2F i) {
depth_point = i.hit_pos;
#ifdef LIMIT_DEPTH_TO_MESH
if (length(ray.start - ray.hit_pos) > length(i.cam_pos - i.hit_pos))
if (length(ray.start - first_hit) > length(i.cam_pos - i.hit_pos))
depth_point = i.hit_pos;
#endif
if (inside_shape) {
depth_point = i.cam_pos + normalize(i.hit_pos - i.cam_pos) * 0.01;
}
#ifdef USE_WORLD_SPACE
float4 clip_pos = mul(UNITY_MATRIX_VP, float4(depth_point, 1));
#else
@ -265,6 +270,10 @@ Ray cast_ray(float3 start, float3 dir, float start_len) {
return ray;
}
float3 default_sky(float3 dir) {
return lRenderSky(dir, normalize(float3(2, 1, 0)));
}
float default_distance_sdf(float3 p) {
return sdSphere(p, 0.5);
}
@ -286,5 +295,4 @@ float3 default_lighting(Ray ray) {
return col;
}
#endif // LIBGARBAGE_INCLUDED