23
2016
Volumetric Image Effect Shader
Converted this old godrays shader ( http://unitycoder.com/blog/2012/10/02/fake-godrays-shader/ ) into image effect – interesting results! (see video below)
Source codes below (Attach script to main camera)
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using UnityEngine; | |
[ExecuteInEditMode] | |
public class VolumetricImageEffect : MonoBehaviour | |
{ | |
public float exposure=0.6f; | |
public float decay = 0.95f; | |
public float density = 0.96f; | |
public float weight = 0.4f; | |
public float clamp = 1f; | |
public int samples = 16; | |
private Material material; | |
// Creates a private material used to the effect | |
void Awake() | |
{ | |
material = new Material(Shader.Find("Hidden/VolumetricLightApproximation")); | |
} | |
// Postprocess the image | |
void OnRenderImage(RenderTexture source, RenderTexture destination) | |
{ | |
if (material == null) | |
{ | |
material = new Material(Shader.Find("Hidden/VolumetricLightApproximation")); | |
} | |
material.SetFloat("fExposure", exposure); | |
material.SetFloat("fDecay", density); | |
material.SetFloat("fDensity", density); | |
material.SetFloat("fWeight", weight); | |
material.SetFloat("fClamp", clamp); | |
material.SetInt("fSamples", samples); | |
Graphics.Blit(source, destination, material); | |
} | |
} |
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// original source: http://demo.bkcore.com/threejs/webgl_tron_godrays.html | |
// converted to surface shader : http://unitycoder.com/blog/2012/10/02/fake-godrays-shader/ | |
// converted to image effect : | |
Shader "Hidden/VolumetricLightApproximation" | |
{ | |
Properties | |
{ | |
_MainTex ("Texture", 2D) = "white" { | |
} | |
fExposure ("fExposure", Float) = 0.6 | |
fDecay ("fDecay", Float) = 0.93 | |
fDensity ("fDensity", Float) = 0.96 | |
fWeight ("fWeight", Float) = 0.4 | |
fClamp ("fClamp", Float) = 1.0 | |
fSamples ("fSamples", Int) = 32 | |
} | |
SubShader | |
{ | |
// No culling or depth | |
Cull Off ZWrite Off ZTest Always | |
Blend SrcAlpha OneMinusSrcAlpha // Traditional transparency | |
Pass | |
{ | |
CGPROGRAM | |
#pragma vertex vert | |
#pragma fragment frag | |
#include "UnityCG.cginc" | |
struct appdata | |
{ | |
float4 vertex : POSITION; | |
float2 uv : TEXCOORD0; | |
}; | |
struct v2f | |
{ | |
float2 uv : TEXCOORD0; | |
float4 vertex : SV_POSITION; | |
}; | |
v2f vert (appdata v) | |
{ | |
v2f o; | |
o.vertex = mul(UNITY_MATRIX_MVP, v.vertex); | |
o.uv = v.uv; | |
return o; | |
} | |
sampler2D _MainTex; | |
float fX,fY,fExposure,fDecay,fDensity,fWeight,fClamp; | |
int fSamples; | |
fixed4 frag (v2f i) : SV_Target | |
{ | |
float2 vUv = i.uv; | |
float2 deltaTextCoord = float2(vUv – float2(0.5,0.5)); | |
deltaTextCoord *= 1.0 / float(fSamples) * fDensity; | |
float2 coord = vUv; | |
float illuminationDecay = 1.0; | |
float4 FragColor = float4(0,0,0,0); | |
for(int i=0; i < fSamples ; i++) | |
{ | |
coord -= deltaTextCoord; | |
float4 texel = tex2D(_MainTex, coord); | |
texel *= illuminationDecay * fWeight; | |
FragColor += texel; | |
illuminationDecay *= fDecay; | |
} | |
FragColor *= fExposure; | |
FragColor = clamp(FragColor, 0.0, fClamp); | |
float4 c = FragColor; | |
return c; | |
} | |
ENDCG | |
} | |
} | |
} |
Scene has just few spotlights, particles, and 3d objects..
—
References:
Image effects tutorial – http://www.alanzucconi.com/2015/07/08/screen-shaders-and-postprocessing-effects-in-unity3d/
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