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Better minimal clouds

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This commit is contained in:
Joshua Barretto 2020-10-24 14:00:08 +01:00
parent 70f0a7c57c
commit 0aca8ee0f7
1 changed files with 10 additions and 5 deletions
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15
assets/voxygen/shaders/include/cloud/regular.glsl
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@ -95,22 +95,27 @@ float dist_to_step(float dist) {
return pow(dist / STEP_SCALE, 0.5);
}
vec3 get_cloud_color(vec3 surf_color, const vec3 dir, vec3 origin, const float time_of_day, float max_dist, const float quality) {
vec3 get_cloud_color(vec3 surf_color, vec3 dir, vec3 origin, const float time_of_day, float max_dist, const float quality) {
// Limit the marching distance to reduce maximum jumps
max_dist = min(max_dist, DIST_CAP);
origin.xyz += focus_off.xyz;
float splay = 1.0;
// This hack adds a little direction-dependent noise to clouds. It's not correct, but it very cheaply
// improves visual quality for low cloud settings
float splay = 1.0;
vec3 dir_diff = vec3(0);
#if (CLOUD_MODE == CLOUD_MODE_MINIMAL)
splay += (texture(t_noise, vec2(atan2(dir.x, dir.y) * 2 / PI, dir.z) * 1.5 - time_of_day * 0.000025).x - 0.5) * 0.4 / (1.0 + pow(dir.z, 2) * 10);
/* splay += (texture(t_noise, vec2(atan2(dir.x, dir.y) * 2 / PI, dir.z) * 1.5 - time_of_day * 0.000025).x - 0.5) * 0.4 / (1.0 + pow(dir.z, 2) * 10); */
dir_diff = vec3(
(texture(t_noise, vec2(atan2(dir.x, dir.y) * 2 / PI, dir.z) * 1.0 - time_of_day * 0.00005).x - 0.5) * 0.2 / (1.0 + pow(dir.z, 2) * 10),
(texture(t_noise, vec2(atan2(dir.x, dir.y) * 2 / PI, dir.z) * 1.0 - time_of_day * 0.00005).x - 0.5) * 0.2 / (1.0 + pow(dir.z, 2) * 10),
(texture(t_noise, vec2(atan2(dir.x, dir.y) * 2 / PI, dir.z) * 1.0 - time_of_day * 0.00005).x - 0.5) * 0.2 / (1.0 + pow(dir.z, 2) * 10)
) * 2000;
#endif
#if (CLOUD_MODE == CLOUD_MODE_MINIMAL || CLOUD_MODE == CLOUD_MODE_LOW)
splay += (texture(t_noise, vec2(atan2(dir.x, dir.y) * 2 / PI, dir.z) * 10.0 - time_of_day * 0.00005).x - 0.5) * 0.075 / (1.0 + pow(dir.z, 2) * 10);
#endif
splay = clamp(splay, 0.5, 1.5);
// Proportion of sunlight that get scattered back into the camera by clouds
float sun_scatter = max(dot(-dir, sun_dir.xyz), 0.5);
@ -125,7 +130,7 @@ vec3 get_cloud_color(vec3 surf_color, const vec3 dir, vec3 origin, const float t
float cdist = max_dist;
while (cdist > 1) {
float ndist = step_to_dist(trunc(dist_to_step(cdist - 0.25)));
vec3 sample = cloud_at(origin + dir * ndist * splay, ndist);
vec3 sample = cloud_at(origin + (dir + dir_diff / ndist) * ndist * splay, ndist);
vec2 density_integrals = sample.yz * (cdist - ndist);