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libgarbage: fix depth of sky, allow limiting depth to mesh, add step multiplier setting

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Crispy 2023-07-25 12:34:08 +02:00
parent 86a3bad992
commit a1030ca528
1 changed files with 24 additions and 4 deletions
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28
Assets/raymarched/lib/libgarbage.cginc
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@ -19,6 +19,9 @@
# don't write depth (will have the depth defined by the original mesh)
DISABLE_DEPTH
# meant for frontface culled meshes, makes depth no further than the mesh edges
LIMIT_DEPTH_TO_MESH
START_RAYS_IN_BOX // TODO: implement
START_RAYS_IN_SPHERE // TODO: implement
*/
@ -43,6 +46,11 @@ START_RAYS_IN_SPHERE // TODO: implement
#define LIGHT_FN default_lighting
#endif
// set to less than one if there are artifacts in distorted sdfs
#ifndef STEP_MULTIPLIER
#define STEP_MULTIPLIER 1
#endif
// max ray steps, from last bounce (reset on each reflection)
#ifndef MAX_STEPS
#define MAX_STEPS 128
@ -156,16 +164,22 @@ FragOut frag (V2F i) {
float prev_gloss = 0;
float3 first_hit;
for (int ray_num = 0; ray_num < REFLECTIONS + 1; ray_num++) {
int ray_num = 0;
for (; ray_num < REFLECTIONS + 1;) {
ray = cast_ray(ray_origin, ray_dir);
if (ray_num == 0) { // before any bounces
col = LIGHT_FN(ray);
first_hit = ray.hit_pos;
if (ray.steps == 0) {
// discard;
// TODO: sky fn
}
} else {
float col_amount = color_used + ((1 - prev_gloss) * (1 - color_used));
col = lerp(LIGHT_FN(ray), col, col_amount);
color_used = col_amount;
}
ray_num++;
if (ray.missed || ray.mat.gloss < 0.01) {
break;
}
@ -175,7 +189,7 @@ FragOut frag (V2F i) {
}
#ifdef DISCARD_ON_MISS
if (ray.missed && ray_num == 0) discard;
if (ray.missed && ray_num == 1) discard;
#endif
FragOut o;
@ -183,8 +197,14 @@ FragOut frag (V2F i) {
#ifndef DISABLE_DEPTH
float3 depth_point = first_hit * SCENE_SCALE;
if (ray.missed && ray_num == 0)
if (ray.missed && ray_num == 1)
depth_point = i.hit_pos;
#ifdef LIMIT_DEPTH_TO_MESH
if (length(ray.start - ray.hit_pos) > length(i.cam_pos - i.hit_pos))
depth_point = i.hit_pos;
#endif
#ifdef USE_WORLD_SPACE
float4 clip_pos = mul(UNITY_MATRIX_VP, float4(depth_point, 1));
#else
@ -225,7 +245,7 @@ Ray cast_ray(float3 start, float3 dir, float start_len) {
break;
}
ray.min_dist = min(ray.min_dist, ray.dist);
ray_len += ray.dist;
ray_len += ray.dist * STEP_MULTIPLIER;
if (ray_len > MAX_DIST) break;
}