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przemyslawzaworskiprzemyslawzaworski
authoredMar 26, 2019
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Diff for: ‎atmospheric_scattering.shader

+151-151
Original file line numberDiff line numberDiff line change
@@ -1,151 +1,151 @@
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// Usage: Windows / Rendering / Lighting Settings -> Environment / Skybox Material
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// Original reference:
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// https://www.scratchapixel.com/lessons/procedural-generation-virtual-worlds/simulating-sky/simulating-colors-of-the-sky
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Shader "Atmospheric Scattering"
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{
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Properties
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{
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_Height("Sun Altitude",Range(-5.0,5.0)) = 0.15
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_Intensity ("Sun Intensity",Range(1.0,40.0)) = 20.0
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_Rayleigh ("Rayleigh Scale",Range(10.0,10000.0)) = 8000.0
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_Mie ("Mie Scale",Range(10.0,5000.0)) = 1200.0
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_Exposure("Exposure",Range(10.0,100.0)) = 60.0
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}
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Subshader
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{
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Tags { "RenderType" = "Background" }
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Pass
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{
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CGPROGRAM
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#pragma vertex VSMain
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#pragma fragment PSMain
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#pragma target 5.0
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float _Height, _Intensity, _Rayleigh, _Mie, _Exposure;
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static const float PI = 3.14159265358979323846;
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static const float PI_2 = 1.57079632679489661923;
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static const float PI_4 = 0.785398163397448309616;
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static const int VIEWDIR_SAMPLES = 12;
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static const int SUNDIR_SAMPLES = 8;
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bool intersect(float3 ro, float3 rd, float ra, float rs, out float tr)
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{
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float c = length(ro);
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float beta = PI - acos(dot(rd, ro / c));
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float sb = sin(beta);
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float b = ra;
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float bt = rs - 10.0;
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tr = sqrt((b * b) - (c * c) * (sb * sb)) + c * cos(beta);
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if (sqrt((bt * bt) - (c * c) * (sb * sb)) + c * cos(beta) > 0.0) return false;
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return true;
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}
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float visibility(float diameter, float alt)
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{
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float vap = 0.0, h = 0.0, a = 0.0;
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float p = clamp((0.5 + alt / diameter), 0.0, 1.0);
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if (p == 0.0)
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{
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return 0.0;
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}
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else if (p == 1.0)
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{
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return 1.0;
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}
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bool sup = false;
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if (p > 0.5)
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{
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sup = true;
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h = (p - 0.5) * 2.0;
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}
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else
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{
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sup = false;
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h = (0.5 - p) * 2.0;
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}
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float alpha = acos(h) * 2.0;
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a = (alpha - sin(alpha)) / (2.0 * PI);
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vap = (sup) ? 1.0 - a : a;
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return vap;
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}
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void VSMain (inout float4 Vertex:POSITION, out float3 Point:TEXCOORD0)
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{
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Point = mul(unity_ObjectToWorld, Vertex); // World Space coordinates
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Vertex = UnityObjectToClipPos (Vertex); // Screen Space coordinates
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}
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void PSMain (float4 Vertex:POSITION, float3 Point:TEXCOORD0, out float4 fragColor:SV_TARGET)
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{
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float3 c = float3(0.0,0.0,0.0);
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float rs = 6360.0e3; // Planet sea level radius
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float ra = 6420.0e3; // Planet atmosphere radius
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float3 rsc = float3(5.5e-6, 13.0e-6, 22.1e-6); // Rayleigh scattering coefs at sea level
85-
float3 msc = float3(21.0e-6, 21.0e-6, 21.0e-6); // Mie scattering coefs at sea level
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float mean = 0.76; // mean cosine
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float azimuth = 5.0; // azimuth
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float diameter = 0.53; // angular diameter (between 0.5244 and 5.422 for sun)
89-
float3 ro = _WorldSpaceCameraPos.xyz + float3(0.0, rs + 1.0, 0.0);
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float3 rd = normalize(Point - _WorldSpaceCameraPos.xyz);
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float s = 0.0;
92-
if (!intersect(ro, rd, ra, rs, s) || s < 0.0)
93-
c = float3(0.0,0.0,0.0);
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float sl = s / float(VIEWDIR_SAMPLES);
95-
float t = 0.0;
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float calt = cos(_Height);
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float3 direction = float3(cos(azimuth) * calt, sin(_Height), sin(azimuth) * calt);
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float mu = dot(rd, direction);
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float mu2 = mu * mu;
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float mc2 = mean * mean;
101-
float3 sumr = float3(0.0,0.0,0.0);
102-
float odr = 0.0;
103-
float phaseR = (3.0 / (16.0 * PI)) * (1.0 + mu2);
104-
float3 summ = float3(0.0,0.0,0.0);
105-
float odm = 0.0;
106-
float phaseM = ((3.0/(8.0*PI))*((1.0-mc2)*(1.0 + mu2)))/((2.0+mc2)*pow(1.0+mc2-2.0*mean*mu,1.5));
107-
for (int i = 0; i < VIEWDIR_SAMPLES; ++i)
108-
{
109-
float3 sp = ro + rd * (t + 0.5 * sl);
110-
float h = length(sp) - rs;
111-
float hr = exp(-h / _Rayleigh) * sl;
112-
odr += hr;
113-
float hm = exp(-h / _Mie) * sl;
114-
odm += hm;
115-
float tm;
116-
float sp_alt = PI_2 - asin(rs / length(sp));
117-
sp_alt += acos(normalize(sp).y) + _Height;
118-
float coef = visibility(diameter, sp_alt);
119-
if (intersect(sp, direction, ra, rs, tm) || coef > 0.0)
120-
{
121-
float sll = tm / float(SUNDIR_SAMPLES);
122-
float tl = 0.0;
123-
float odlr = 0.0, odlm = 0.0;
124-
for (int j = 0; j < SUNDIR_SAMPLES; ++j)
125-
{
126-
float3 spl = sp + direction * (tl + 0.5 * sll);
127-
float spl_alt = PI_2 - asin(rs / length(spl));
128-
spl_alt += acos(normalize(spl).y) + _Height;
129-
float coefl = visibility(diameter, spl_alt);
130-
float hl = length(spl) - rs;
131-
odlr += exp(-hl / _Rayleigh) * sll * (1.0 - log(coefl + 0.000001));
132-
odlm += exp(-hl / _Mie) * sll * (1.0 - log(coefl + 0.000001));
133-
tl += sll;
134-
}
135-
float3 tau = rsc * (odr + odlr) + msc * 1.05 * (odm + odlm);
136-
float3 attenuation = float3(exp(-tau.x), exp(-tau.y), exp(-tau.z));
137-
sumr += hr * attenuation * coef;
138-
summ += hm * attenuation * coef;
139-
}
140-
t += sl;
141-
}
142-
c = _Intensity * (sumr * phaseR * rsc + summ * phaseM * msc);
143-
c = log2(1.0+ c * _Exposure);
144-
c = smoothstep(0.6, 7.8, c);
145-
c = c * c * c * (c * (c * 6.0 - 15.0) + 10.0);
146-
fragColor = float4(c, 1.0);
147-
}
148-
ENDCG
149-
}
150-
}
151-
}
1+
// Usage: Windows / Rendering / Lighting Settings -> Environment / Skybox Material
2+
// Original reference:
3+
// https://www.scratchapixel.com/lessons/procedural-generation-virtual-worlds/simulating-sky/simulating-colors-of-the-sky
4+
5+
Shader "Atmospheric Scattering"
6+
{
7+
Properties
8+
{
9+
_Height("Sun Altitude",Range(-5.0,5.0)) = 0.15
10+
_Intensity ("Sun Intensity",Range(1.0,40.0)) = 20.0
11+
_Rayleigh ("Rayleigh Scale",Range(10.0,10000.0)) = 8000.0
12+
_Mie ("Mie Scale",Range(10.0,5000.0)) = 1200.0
13+
_Exposure("Exposure",Range(10.0,100.0)) = 60.0
14+
}
15+
Subshader
16+
{
17+
Tags { "RenderType" = "Background" }
18+
Pass
19+
{
20+
CGPROGRAM
21+
#pragma vertex VSMain
22+
#pragma fragment PSMain
23+
#pragma target 5.0
24+
25+
float _Height, _Intensity, _Rayleigh, _Mie, _Exposure;
26+
static const float PI = 3.14159265358979323846;
27+
static const float PI_2 = 1.57079632679489661923;
28+
static const float PI_4 = 0.785398163397448309616;
29+
static const int VIEWDIR_SAMPLES = 12;
30+
static const int SUNDIR_SAMPLES = 8;
31+
32+
bool intersect(float3 ro, float3 rd, float ra, float rs, out float tr)
33+
{
34+
float c = length(ro);
35+
float beta = PI - acos(dot(rd, ro / c));
36+
float sb = sin(beta);
37+
float b = ra;
38+
float bt = rs - 10.0;
39+
tr = sqrt((b * b) - (c * c) * (sb * sb)) + c * cos(beta);
40+
if (sqrt((bt * bt) - (c * c) * (sb * sb)) + c * cos(beta) > 0.0) return false;
41+
return true;
42+
}
43+
44+
float visibility(float diameter, float alt)
45+
{
46+
float vap = 0.0, h = 0.0, a = 0.0;
47+
float p = clamp((0.5 + alt / diameter), 0.0, 1.0);
48+
if (p == 0.0)
49+
{
50+
return 0.0;
51+
}
52+
else if (p == 1.0)
53+
{
54+
return 1.0;
55+
}
56+
bool sup = false;
57+
if (p > 0.5)
58+
{
59+
sup = true;
60+
h = (p - 0.5) * 2.0;
61+
}
62+
else
63+
{
64+
sup = false;
65+
h = (0.5 - p) * 2.0;
66+
}
67+
float alpha = acos(h) * 2.0;
68+
a = (alpha - sin(alpha)) / (2.0 * PI);
69+
vap = (sup) ? 1.0 - a : a;
70+
return vap;
71+
}
72+
73+
void VSMain (inout float4 Vertex:POSITION, out float3 Point:TEXCOORD0)
74+
{
75+
Point = mul(unity_ObjectToWorld, Vertex); // World Space coordinates
76+
Vertex = UnityObjectToClipPos (Vertex); // Screen Space coordinates
77+
}
78+
79+
void PSMain (float4 Vertex:POSITION, float3 Point:TEXCOORD0, out float4 fragColor:SV_TARGET)
80+
{
81+
float3 c = float3(0.0,0.0,0.0);
82+
float rs = 6360.0e3; // Planet sea level radius
83+
float ra = 6420.0e3; // Planet atmosphere radius
84+
float3 rsc = float3(5.5e-6, 13.0e-6, 22.1e-6); // Rayleigh scattering coefs at sea level
85+
float3 msc = float3(21.0e-6, 21.0e-6, 21.0e-6); // Mie scattering coefs at sea level
86+
float mean = 0.76; // mean cosine
87+
float azimuth = 5.0; // azimuth
88+
float diameter = 0.53; // angular diameter (between 0.5244 and 5.422 for sun)
89+
float3 ro = _WorldSpaceCameraPos.xyz + float3(0.0, rs + 1.0, 0.0);
90+
float3 rd = normalize(Point - _WorldSpaceCameraPos.xyz);
91+
float s = 0.0;
92+
if (!intersect(ro, rd, ra, rs, s) || s < 0.0)
93+
c = float3(0.0,0.0,0.0);
94+
float sl = s / float(VIEWDIR_SAMPLES);
95+
float t = 0.0;
96+
float calt = cos(_Height);
97+
float3 direction = float3(cos(azimuth) * calt, sin(_Height), sin(azimuth) * calt);
98+
float mu = dot(rd, direction);
99+
float mu2 = mu * mu;
100+
float mc2 = mean * mean;
101+
float3 sumr = float3(0.0,0.0,0.0);
102+
float odr = 0.0;
103+
float phaseR = (3.0 / (16.0 * PI)) * (1.0 + mu2);
104+
float3 summ = float3(0.0,0.0,0.0);
105+
float odm = 0.0;
106+
float phaseM = ((3.0/(8.0*PI))*((1.0-mc2)*(1.0 + mu2)))/((2.0+mc2)*pow(1.0+mc2-2.0*mean*mu,1.5));
107+
for (int i = 0; i < VIEWDIR_SAMPLES; ++i)
108+
{
109+
float3 sp = ro + rd * (t + 0.5 * sl);
110+
float h = length(sp) - rs;
111+
float hr = exp(-h / _Rayleigh) * sl;
112+
odr += hr;
113+
float hm = exp(-h / _Mie) * sl;
114+
odm += hm;
115+
float tm;
116+
float sp_alt = PI_2 - asin(rs / length(sp));
117+
sp_alt += acos(normalize(sp).y) + _Height;
118+
float coef = visibility(diameter, sp_alt);
119+
if (intersect(sp, direction, ra, rs, tm) || coef > 0.0)
120+
{
121+
float sll = tm / float(SUNDIR_SAMPLES);
122+
float tl = 0.0;
123+
float odlr = 0.0, odlm = 0.0;
124+
for (int j = 0; j < SUNDIR_SAMPLES; ++j)
125+
{
126+
float3 spl = sp + direction * (tl + 0.5 * sll);
127+
float spl_alt = PI_2 - asin(rs / length(spl));
128+
spl_alt += acos(normalize(spl).y) + _Height;
129+
float coefl = visibility(diameter, spl_alt);
130+
float hl = length(spl) - rs;
131+
odlr += exp(-hl / _Rayleigh) * sll * (1.0 - log(coefl + 0.000001));
132+
odlm += exp(-hl / _Mie) * sll * (1.0 - log(coefl + 0.000001));
133+
tl += sll;
134+
}
135+
float3 tau = rsc * (odr + odlr) + msc * 1.05 * (odm + odlm);
136+
float3 attenuation = float3(exp(-tau.x), exp(-tau.y), exp(-tau.z));
137+
sumr += hr * attenuation * coef;
138+
summ += hm * attenuation * coef;
139+
}
140+
t += sl;
141+
}
142+
c = _Intensity * (sumr * phaseR * rsc + summ * phaseM * msc);
143+
c = log2(1.0+ c * _Exposure);
144+
c = smoothstep(0.6, 7.8, c);
145+
c = c * c * c * (c * (c * 6.0 - 15.0) + 10.0);
146+
fragColor = float4(c, 1.0);
147+
}
148+
ENDCG
149+
}
150+
}
151+
}

Diff for: ‎image_compression.shader

+3-3
Original file line numberDiff line numberDiff line change
@@ -1,10 +1,10 @@
1-
Shader "Image Compression"
1+
Shader "Image Compression"
22
{
33
SubShader
44
{
55
Pass
66
{
7-
CGPROGRAM
7+
CGPROGRAM
88
#pragma vertex VSMain
99
#pragma fragment PSMain
1010
#pragma target 5.0
@@ -169,4 +169,4 @@ Shader "Image Compression"
169169
ENDCG
170170
}
171171
}
172-
}
172+
}

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