Custom shaders and shadows

November 22, 2015 Ronnie 6 Comments

Since I’m quite new to this shader business I’m bumping into problems here and there, and this time I’m really struggling with solving it.

I’ve made this shader that I’ve gotten to cast shadows with a custom ShadowCaster pass but I’m still not able to get it to collect shadows in any way. I’ve tried getting the fallback to handle the ShadowCollector pass, I’ve tried diffent ways to write the shadowcollector pass, and I’ve tried setting the Queue to geometry and RenderType to Opaque instead of Transparent..

Shader coding in Unity is hard, because there isn’t much info to be found anywhere about how things work and how it should be done. Does anyone out there have any tips on how I can get this to work?

See the code below or download the shader here.

Shader "Trolltunga/LowPolyCollisionRadialWaves" 
{
	Properties
	{
		_MainTex("Diffuse (RGB)", 2D) = "white" {}
		_Color("Color", Color) = (1,0,0,1)
		_SpecColor("Specular Material Color", Color) = (1,1,1,1)
		_Shininess("Shininess", Float) = 1.0
		_AlphaFactor("Alpha factor", Range(0, 1.0)) = 0.5
		_WaveLength("Wave length", Float) = 0.5
		_WaveHeight("Wave height", Float) = 0.5
		_WaveSpeed("Wave speed", Float) = 1.0
		_RandomHeight("Random height", Float) = 0.5
		_RandomSpeed("Random Speed", Float) = 0.5
		_CollisionWaveLength("Collision wave length", Float) = 2.0

	}

	SubShader
	{
		Tags { "Queue" = "Geometry" "RenderType" = "Opaque" } //"AlphaTest" "IgnoreProjector" = "True" "RenderType" = "Transparent" }
		Blend SrcAlpha OneMinusSrcAlpha

		Pass
		{
			Tags{ "LightMode" = "ForwardBase" }

			CGPROGRAM
				#pragma target 5.0
				#pragma vertex vert
				#pragma geometry geom
				#pragma fragment frag 
				#pragma fragmentoption ARB_precision_hint_fastest
				#pragma multi_compile_fwdbase
				#include "UnityCG.cginc"			
				#include "AutoLight.cginc"

				float rand(float3 co)
				{
					return frac(sin(dot(co.xyz ,float3(12.9898,78.233,45.5432))) * 43758.5453);
				}

				float rand2(float3 co)
				{
					return frac(sin(dot(co.xyz ,float3(19.9128,75.2,34.5122))) * 12765.5213);
				}

				float _WaveLength;
				float _WaveHeight;
				float _WaveSpeed;
				float _RandomHeight;
				float _RandomSpeed;
				float _CollisionWaveLength;
				vector _CollisionVectors[20];

				uniform float4 _LightColor0;

				uniform float4 _Color;
				uniform float4 _SpecColor;
				uniform float _Shininess;
				uniform float _AlphaFactor;

				sampler2D _CameraDepthTexture; 

				struct v2g
				{
					float4  pos : SV_POSITION;
					float3	norm : NORMAL;
					LIGHTING_COORDS(0, 1)
				};

				struct g2f
				{
					float4 pos : SV_POSITION;
					float3 norm : NORMAL;
					float3 diffuseColor : TEXCOORD2;
					float3 specularColor : TEXCOORD3;
				};

				v2g vert(appdata_full v)
				{
					float3 v0 = mul((float3x3)_Object2World, v.vertex).xyz;

					float collPhase = 0.0;

					for (int i = 0; i < 20; i++)
					{
						float distanceToCenter = length(v0.xz - _CollisionVectors[i].xy);
						float waveHeight = _CollisionVectors[i].z;
						float waveState = _CollisionVectors[i].w;

						if (distanceToCenter < _CollisionWaveLength * 10 * waveState)
						{
							collPhase += (waveHeight * ((1.0 - waveState) * distanceToCenter) / (_CollisionWaveLength * 10 * waveState)) * sin(distanceToCenter - (_CollisionWaveLength * 10 * waveState));
						}
					}

					float phase0 = (_WaveHeight)* sin((_Time[1] * _WaveSpeed) + (v0.x * _WaveLength) + (v0.z * _WaveLength) + rand2(v0.xzz));
					float phase0_1 = (_RandomHeight)* sin(cos(rand(v0.xzz) * _RandomHeight * cos(_Time[1] * _RandomSpeed * sin(rand(v0.xxz)))));
					float phase0_2 = (_WaveHeight / 5.0) * sin((_Time[1] * _WaveSpeed * 3.0) + (v0.x * -_WaveLength * 4.0) + (v0.z * _WaveLength * 4.0) + rand2(v0.xzz));

					v0.y += collPhase + phase0 + phase0_1 + phase0_2;

					v.vertex.xyz = mul((float3x3)_World2Object, v0);

					v2g o;
					o.pos = v.vertex;
					o.norm = v.normal;
					TRANSFER_VERTEX_TO_FRAGMENT(o);
					return o;
				}

				[maxvertexcount(3)]
				void geom(triangle v2g IN[3], inout TriangleStream<g2f> triStream)
				{
					float3 v0 = IN[0].pos.xyz;
					float3 v1 = IN[1].pos.xyz;
					float3 v2 = IN[2].pos.xyz;

					float3 centerPos = (v0 + v1 + v2) / 3.0;

					float3 vn = normalize(cross(v1 - v0, v2 - v0));

					float4x4 modelMatrix = _Object2World;
					float4x4 modelMatrixInverse = _World2Object;

					float3 normalDirection = normalize(
						mul(float4(vn, 0.0), modelMatrixInverse).xyz);
					float3 viewDirection = normalize(_WorldSpaceCameraPos
						- mul(modelMatrix, float4(centerPos, 0.0)).xyz);
					float3 lightDirection = normalize(_WorldSpaceLightPos0.xyz);
					float attenuation = (LIGHT_ATTENUATION(IN[0]) + LIGHT_ATTENUATION(IN[1]) + LIGHT_ATTENUATION(IN[2])) / 3;

					float3 ambientLighting =
						UNITY_LIGHTMODEL_AMBIENT.rgb * _Color.rgb;

					float3 diffuseReflection =
						attenuation * _LightColor0.rgb * _Color.rgb
						* max(0.0, dot(normalDirection, lightDirection));

					float3 specularReflection;
					if (dot(normalDirection, lightDirection) < 0.0)
					{
						specularReflection = float3(0.0, 0.0, 0.0);
					}
					else
					{
						specularReflection = attenuation * _LightColor0.rgb
							* _SpecColor.rgb * pow(max(0.0, dot(
								reflect(-lightDirection, normalDirection),
								viewDirection)), _Shininess);
					}

					g2f o;
					o.pos = mul(UNITY_MATRIX_MVP, IN[0].pos);
					o.norm = vn;
					o.diffuseColor = ambientLighting + diffuseReflection;
					o.specularColor = specularReflection;
					triStream.Append(o);

					o.pos = mul(UNITY_MATRIX_MVP, IN[1].pos);
					o.norm = vn;
					o.diffuseColor = ambientLighting + diffuseReflection;
					o.specularColor = specularReflection;
					triStream.Append(o);

					o.pos = mul(UNITY_MATRIX_MVP, IN[2].pos);
					o.norm = vn;
					o.diffuseColor = ambientLighting + diffuseReflection;
					o.specularColor = specularReflection;
					triStream.Append(o);

				}

				half4 frag(g2f IN) : COLOR
				{
					float z1 = tex2Dproj(_CameraDepthTexture, IN.pos); 
					z1 = LinearEyeDepth(z1);
					float z2 = (IN.pos.z);
					z1 = saturate(0.125 * (abs(z2 - z1)));
					fixed atten = LIGHT_ATTENUATION(IN);

					return float4(IN.specularColor +
					IN.diffuseColor * atten, saturate(z1*0.1) + _AlphaFactor);
				}
			ENDCG
		}

		Pass
		{
            Name "ShadowCaster"
			Tags{ "LightMode" = "ShadowCaster" }

			Fog{ Mode Off }
			ZWrite On ZTest Less Cull Off
            Offset [_ShadowBias],[_ShadowBiasSlope]

			CGPROGRAM
				#pragma vertex vert
				#pragma fragment frag
				#pragma multi_compile_shadowcaster
				#pragma fragmentoption ARB_precision_hint_fastest
				#include "UnityCG.cginc"

				float rand(float3 co)
				{
					return frac(sin(dot(co.xyz ,float3(12.9898,78.233,45.5432))) * 43758.5453);
				}

				float rand2(float3 co)
				{
					return frac(sin(dot(co.xyz ,float3(19.9128,75.2,34.5122))) * 12765.5213);
				}

				float _WaveLength;
				float _WaveHeight;
				float _WaveSpeed;
				float _RandomHeight;
				float _RandomSpeed;
				float _CollisionWaveLength;
				vector _CollisionVectors[20];

				struct v2f
				{
					V2F_SHADOW_CASTER;
				};
				
				v2f vert(appdata_base v)
				{
					float3 v0 = mul((float3x3)_Object2World, v.vertex).xyz;

					float collPhase = 0.0;

					for (int i = 0; i < 20; i++)
					{
						float distanceToCenter = length(v0.xz - _CollisionVectors[i].xy);
						float waveHeight = _CollisionVectors[i].z;
						float waveState = _CollisionVectors[i].w;

						if (distanceToCenter < _CollisionWaveLength * 10 * waveState)
						{
							collPhase += (waveHeight * ((1.0 - waveState) * distanceToCenter) / (_CollisionWaveLength * 10 * waveState)) * sin(distanceToCenter - (_CollisionWaveLength * 10 * waveState));
						}
					}

					float phase0 = (_WaveHeight)* sin((_Time[1] * _WaveSpeed) + (v0.x * _WaveLength) + (v0.z * _WaveLength) + rand2(v0.xzz));
					float phase0_1 = (_RandomHeight)* sin(cos(rand(v0.xzz) * _RandomHeight * cos(_Time[1] * _RandomSpeed * sin(rand(v0.xxz)))));
					float phase0_2 = (_WaveHeight / 5.0) * sin((_Time[1] * _WaveSpeed * 3.0) + (v0.x * -_WaveLength * 4.0) + (v0.z * _WaveLength * 4.0) + rand2(v0.xzz));

					v0.y += collPhase + phase0 + phase0_1 + phase0_2;

					v.vertex.xyz = mul((float3x3)_World2Object, v0);

					v2f o;
					o.pos = mul(UNITY_MATRIX_MVP, v.vertex);
					return o;
				}
				
				float4 frag(v2f i) : COLOR
				{
					SHADOW_CASTER_FRAGMENT(i)
				}
			ENDCG
		}

		Pass
		{
			Name "ShadowCollector"
			Tags{ "LightMode" = "ShadowCollector" }
		
			Fog{ Mode Off }
			ZWrite On ZTest LEqual
		
			CGPROGRAM
				#pragma vertex vert
				#pragma fragment frag
				#pragma fragmentoption ARB_precision_hint_fastest
				#pragma multi_compile_shadowcollector
				#define SHADOW_COLLECTOR_PASS
				#include "UnityCG.cginc"

				float rand(float3 co)
				{
					return frac(sin(dot(co.xyz ,float3(12.9898,78.233,45.5432))) * 43758.5453);
				}

				float rand2(float3 co)
				{
					return frac(sin(dot(co.xyz ,float3(19.9128,75.2,34.5122))) * 12765.5213);
				}

				float _WaveLength;
				float _WaveHeight;
				float _WaveSpeed;
				float _RandomHeight;
				float _RandomSpeed;
				float _CollisionWaveLength;
				vector _CollisionVectors[20];

				struct appdata 
				{
					float4 vertex : POSITION;
				};
			
				struct v2f 
				{
					V2F_SHADOW_COLLECTOR;
				};
			
				v2f vert(appdata v) 
				{
					float3 v0 = mul((float3x3)_Object2World, v.vertex).xyz;

					float collPhase = 0.0;

					for (int i = 0; i < 20; i++)
					{
						float distanceToCenter = length(v0.xz - _CollisionVectors[i].xy);
						float waveHeight = _CollisionVectors[i].z;
						float waveState = _CollisionVectors[i].w;

						if (distanceToCenter < _CollisionWaveLength * 10 * waveState)
						{
							collPhase += (waveHeight * ((1.0 - waveState) * distanceToCenter) / (_CollisionWaveLength * 10 * waveState)) * sin(distanceToCenter - (_CollisionWaveLength * 10 * waveState));
						}
					}

					float phase0 = (_WaveHeight)* sin((_Time[1] * _WaveSpeed) + (v0.x * _WaveLength) + (v0.z * _WaveLength) + rand2(v0.xzz));
					float phase0_1 = (_RandomHeight)* sin(cos(rand(v0.xzz) * _RandomHeight * cos(_Time[1] * _RandomSpeed * sin(rand(v0.xxz)))));
					float phase0_2 = (_WaveHeight / 5.0) * sin((_Time[1] * _WaveSpeed * 3.0) + (v0.x * -_WaveLength * 4.0) + (v0.z * _WaveLength * 4.0) + rand2(v0.xzz));

					v0.y += collPhase + phase0 + phase0_1 + phase0_2;

					v.vertex.xyz = mul((float3x3)_World2Object, v0);

					v2f o;
					o.pos = mul(UNITY_MATRIX_MVP, v.vertex);
					TRANSFER_SHADOW_COLLECTOR(o)
					return o;

				}
			
				fixed4 frag(v2f i) : COLOR
				{
					SHADOW_COLLECTOR_FRAGMENT(i)
				}
			ENDCG
		}
	}
	Fallback "Diffuse"
}

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Shader "Trolltunga/LowPolyCollisionRadialWaves"

{

Properties

{

_MainTex("Diffuse (RGB)", 2D) = "white" {}

_Color("Color", Color) = (1,0,0,1)

_SpecColor("Specular Material Color", Color) = (1,1,1,1)

_Shininess("Shininess", Float) = 1.0

_AlphaFactor("Alpha factor", Range(0, 1.0)) = 0.5

_WaveLength("Wave length", Float) = 0.5

_WaveHeight("Wave height", Float) = 0.5

_WaveSpeed("Wave speed", Float) = 1.0

_RandomHeight("Random height", Float) = 0.5

_RandomSpeed("Random Speed", Float) = 0.5

_CollisionWaveLength("Collision wave length", Float) = 2.0

}

SubShader

{

Tags { "Queue" = "Geometry" "RenderType" = "Opaque" } //"AlphaTest" "IgnoreProjector" = "True" "RenderType" = "Transparent" }

Blend SrcAlpha OneMinusSrcAlpha

Pass

{

Tags{ "LightMode" = "ForwardBase" }

CGPROGRAM

#pragma target 5.0

#pragma vertex vert

#pragma geometry geom

#pragma fragment frag

#pragma fragmentoption ARB_precision_hint_fastest

#pragma multi_compile_fwdbase

#include "UnityCG.cginc"

#include "AutoLight.cginc"

float rand(float3 co)

{

return frac(sin(dot(co.xyz ,float3(12.9898,78.233,45.5432))) * 43758.5453);

}

float rand2(float3 co)

{

return frac(sin(dot(co.xyz ,float3(19.9128,75.2,34.5122))) * 12765.5213);

}

float _WaveLength;

float _WaveHeight;

float _WaveSpeed;

float _RandomHeight;

float _RandomSpeed;

float _CollisionWaveLength;

vector _CollisionVectors[20];

uniform float4 _LightColor0;

uniform float4 _Color;

uniform float4 _SpecColor;

uniform float _Shininess;

uniform float _AlphaFactor;

sampler2D _CameraDepthTexture;

struct v2g

{

float4 pos : SV_POSITION;

float3 norm : NORMAL;

LIGHTING_COORDS(0, 1)

};

struct g2f

{

float4 pos : SV_POSITION;

float3 norm : NORMAL;

float3 diffuseColor : TEXCOORD2;

float3 specularColor : TEXCOORD3;

};

v2g vert(appdata_full v)

{

float3 v0 = mul((float3x3)_Object2World, v.vertex).xyz;

float collPhase = 0.0;

for (int i = 0; i < 20; i++)

{

float distanceToCenter = length(v0.xz - _CollisionVectors[i].xy);

float waveHeight = _CollisionVectors[i].z;

float waveState = _CollisionVectors[i].w;

if (distanceToCenter < _CollisionWaveLength * 10 * waveState)

{

collPhase += (waveHeight * ((1.0 - waveState) * distanceToCenter) / (_CollisionWaveLength * 10 * waveState)) * sin(distanceToCenter - (_CollisionWaveLength * 10 * waveState));

}

float phase0 = (_WaveHeight)* sin((_Time[1] * _WaveSpeed) + (v0.x * _WaveLength) + (v0.z * _WaveLength) + rand2(v0.xzz));

float phase0_1 = (_RandomHeight)* sin(cos(rand(v0.xzz) * _RandomHeight * cos(_Time[1] * _RandomSpeed * sin(rand(v0.xxz)))));

float phase0_2 = (_WaveHeight / 5.0) * sin((_Time[1] * _WaveSpeed * 3.0) + (v0.x * -_WaveLength * 4.0) + (v0.z * _WaveLength * 4.0) + rand2(v0.xzz));

v0.y += collPhase + phase0 + phase0_1 + phase0_2;

v.vertex.xyz = mul((float3x3)_World2Object, v0);

v2g o;

o.pos = v.vertex;

o.norm = v.normal;

TRANSFER_VERTEX_TO_FRAGMENT(o);

return o;

}

[maxvertexcount(3)]

void geom(triangle v2g IN[3], inout TriangleStream<g2f> triStream)

{

float3 v0 = IN[0].pos.xyz;

float3 v1 = IN[1].pos.xyz;

float3 v2 = IN[2].pos.xyz;

float3 centerPos = (v0 + v1 + v2) / 3.0;

float3 vn = normalize(cross(v1 - v0, v2 - v0));

float4x4 modelMatrix = _Object2World;

float4x4 modelMatrixInverse = _World2Object;

float3 normalDirection = normalize(

mul(float4(vn, 0.0), modelMatrixInverse).xyz);

float3 viewDirection = normalize(_WorldSpaceCameraPos

- mul(modelMatrix, float4(centerPos, 0.0)).xyz);

float3 lightDirection = normalize(_WorldSpaceLightPos0.xyz);

float attenuation = (LIGHT_ATTENUATION(IN[0]) + LIGHT_ATTENUATION(IN[1]) + LIGHT_ATTENUATION(IN[2])) / 3;

float3 ambientLighting =

UNITY_LIGHTMODEL_AMBIENT.rgb * _Color.rgb;

float3 diffuseReflection =

attenuation * _LightColor0.rgb * _Color.rgb

* max(0.0, dot(normalDirection, lightDirection));

float3 specularReflection;

if (dot(normalDirection, lightDirection) < 0.0)

{

specularReflection = float3(0.0, 0.0, 0.0);

}

else

{

specularReflection = attenuation * _LightColor0.rgb

* _SpecColor.rgb * pow(max(0.0, dot(

reflect(-lightDirection, normalDirection),

viewDirection)), _Shininess);

}

g2f o;

o.pos = mul(UNITY_MATRIX_MVP, IN[0].pos);

o.norm = vn;

o.diffuseColor = ambientLighting + diffuseReflection;

o.specularColor = specularReflection;

triStream.Append(o);

o.pos = mul(UNITY_MATRIX_MVP, IN[1].pos);

o.norm = vn;

o.diffuseColor = ambientLighting + diffuseReflection;

o.specularColor = specularReflection;

triStream.Append(o);

o.pos = mul(UNITY_MATRIX_MVP, IN[2].pos);

o.norm = vn;

o.diffuseColor = ambientLighting + diffuseReflection;

o.specularColor = specularReflection;

triStream.Append(o);

}

half4 frag(g2f IN) : COLOR

{

float z1 = tex2Dproj(_CameraDepthTexture, IN.pos);

z1 = LinearEyeDepth(z1);

float z2 = (IN.pos.z);

z1 = saturate(0.125 * (abs(z2 - z1)));

fixed atten = LIGHT_ATTENUATION(IN);

return float4(IN.specularColor +

IN.diffuseColor * atten, saturate(z1*0.1) + _AlphaFactor);

}

ENDCG

}

Pass

{

Name "ShadowCaster"

Tags{ "LightMode" = "ShadowCaster" }

Fog{ Mode Off }

ZWrite On ZTest Less Cull Off

Offset [_ShadowBias],[_ShadowBiasSlope]

CGPROGRAM

#pragma vertex vert

#pragma fragment frag

#pragma multi_compile_shadowcaster

#pragma fragmentoption ARB_precision_hint_fastest

#include "UnityCG.cginc"

float rand(float3 co)

{

return frac(sin(dot(co.xyz ,float3(12.9898,78.233,45.5432))) * 43758.5453);

}

float rand2(float3 co)

{

return frac(sin(dot(co.xyz ,float3(19.9128,75.2,34.5122))) * 12765.5213);

}

float _WaveLength;

float _WaveHeight;

float _WaveSpeed;

float _RandomHeight;

float _RandomSpeed;

float _CollisionWaveLength;

vector _CollisionVectors[20];

struct v2f

{

V2F_SHADOW_CASTER;

};

v2f vert(appdata_base v)

{

float3 v0 = mul((float3x3)_Object2World, v.vertex).xyz;

float collPhase = 0.0;

for (int i = 0; i < 20; i++)

{

float distanceToCenter = length(v0.xz - _CollisionVectors[i].xy);

float waveHeight = _CollisionVectors[i].z;

float waveState = _CollisionVectors[i].w;

if (distanceToCenter < _CollisionWaveLength * 10 * waveState)

{

collPhase += (waveHeight * ((1.0 - waveState) * distanceToCenter) / (_CollisionWaveLength * 10 * waveState)) * sin(distanceToCenter - (_CollisionWaveLength * 10 * waveState));

}

float phase0 = (_WaveHeight)* sin((_Time[1] * _WaveSpeed) + (v0.x * _WaveLength) + (v0.z * _WaveLength) + rand2(v0.xzz));

float phase0_1 = (_RandomHeight)* sin(cos(rand(v0.xzz) * _RandomHeight * cos(_Time[1] * _RandomSpeed * sin(rand(v0.xxz)))));

float phase0_2 = (_WaveHeight / 5.0) * sin((_Time[1] * _WaveSpeed * 3.0) + (v0.x * -_WaveLength * 4.0) + (v0.z * _WaveLength * 4.0) + rand2(v0.xzz));

v0.y += collPhase + phase0 + phase0_1 + phase0_2;

v.vertex.xyz = mul((float3x3)_World2Object, v0);

v2f o;

o.pos = mul(UNITY_MATRIX_MVP, v.vertex);

return o;

}

float4 frag(v2f i) : COLOR

{

SHADOW_CASTER_FRAGMENT(i)

}

ENDCG

}

Pass

{

Name "ShadowCollector"

Tags{ "LightMode" = "ShadowCollector" }

Fog{ Mode Off }

ZWrite On ZTest LEqual

CGPROGRAM

#pragma vertex vert

#pragma fragment frag

#pragma fragmentoption ARB_precision_hint_fastest

#pragma multi_compile_shadowcollector

#define SHADOW_COLLECTOR_PASS

#include "UnityCG.cginc"

float rand(float3 co)

{

return frac(sin(dot(co.xyz ,float3(12.9898,78.233,45.5432))) * 43758.5453);

}

float rand2(float3 co)

{

return frac(sin(dot(co.xyz ,float3(19.9128,75.2,34.5122))) * 12765.5213);

}

float _WaveLength;

float _WaveHeight;

float _WaveSpeed;

float _RandomHeight;

float _RandomSpeed;

float _CollisionWaveLength;

vector _CollisionVectors[20];

struct appdata

{

float4 vertex : POSITION;

};

struct v2f

{

V2F_SHADOW_COLLECTOR;

};

v2f vert(appdata v)

{

float3 v0 = mul((float3x3)_Object2World, v.vertex).xyz;

float collPhase = 0.0;

for (int i = 0; i < 20; i++)

{

float distanceToCenter = length(v0.xz - _CollisionVectors[i].xy);

float waveHeight = _CollisionVectors[i].z;

float waveState = _CollisionVectors[i].w;

if (distanceToCenter < _CollisionWaveLength * 10 * waveState)

{

collPhase += (waveHeight * ((1.0 - waveState) * distanceToCenter) / (_CollisionWaveLength * 10 * waveState)) * sin(distanceToCenter - (_CollisionWaveLength * 10 * waveState));

}

float phase0 = (_WaveHeight)* sin((_Time[1] * _WaveSpeed) + (v0.x * _WaveLength) + (v0.z * _WaveLength) + rand2(v0.xzz));

float phase0_1 = (_RandomHeight)* sin(cos(rand(v0.xzz) * _RandomHeight * cos(_Time[1] * _RandomSpeed * sin(rand(v0.xxz)))));

float phase0_2 = (_WaveHeight / 5.0) * sin((_Time[1] * _WaveSpeed * 3.0) + (v0.x * -_WaveLength * 4.0) + (v0.z * _WaveLength * 4.0) + rand2(v0.xzz));

v0.y += collPhase + phase0 + phase0_1 + phase0_2;

v.vertex.xyz = mul((float3x3)_World2Object, v0);

v2f o;

o.pos = mul(UNITY_MATRIX_MVP, v.vertex);

TRANSFER_SHADOW_COLLECTOR(o)

return o;

}

fixed4 frag(v2f i) : COLOR

{

SHADOW_COLLECTOR_FRAGMENT(i)

}

ENDCG

}

Fallback "Diffuse"

}

Coding, Design, Graphics

Low poly water shader:evolved

November 18, 2015 Ronnie 3 Comments

Hi, folks! I’ve continued working on my water shader! I’ve added transparency and today I added impact waves to the shader, which I’m quite happy with managing to do! It’s limited to 10 simultaneous “impact waves” at the same time at the moment. But adding more is not a problem. The collision points and impact force is sent to shader from script. And waves are calculated in shader.
Have a look at what it looks like in action:

Coding, Games, Graphics, Tips

Low poly water shader

November 11, 2015 Ronnie 41 Comments

Edit: I’ve added a link to a downloadable version of the shader! Copying the code from this post does crazy stuff to the symbols..

The side tracking specialist strikes again.

I’ve been working on another project lately and ended up in need of low poly flat shaded animated water.

I tried editing the mesh at runtime by script. Using the method mentioned by joni.giuro here: http://forum.unity3d.com/threads/low-poly-water-help.276685/

But when using the standard plane with this script, basically 200 triangles and when you’ve separeted all vertices (600), FPS drops down from 1500 without script to 190 with script applied. If you add more planes or models with more triangles you quickly get to a point where you get 1 FPS. So I needed something else.

That’s when I figured I’d try my luck with shaders.

Tried googling for solutions, but nothing was to be found so I needed to build my own. With no experience in shader programming this proved to be harder than I expected. But fast forward through some horrible looking results to today. Now I’ve gotten to a point where I can take any plane (not having to worry about splitting verts) applying my shader and getting this:

Almost no hit on FPS with fully animated low poly flat shaded water with specular color. And with this solution:

I can add looots of planes with this shader with almost no hit on FPS. Here I’ve added got 30 standard Unity planes with 200 tris each, all animating off into the distance.

Here’s a video of it in motion:

So how is this done, you say?

Code below.

It’s not perfect but it works! F.ex. I’ve left the UV coords in there but don’t need them for this. And I’m not entirely happy with the waves just yet.. But here you go.

Link to downloadable version

Shader "Trolltunga/LowPolyWaves 2.0"
{
Properties
{
_Color("Color", Color) = (1,0,0,1)
_SpecColor("Specular Material Color", Color) = (1,1,1,1)
_Shininess("Shininess", Float) = 1.0
_WaveLength("Wave length", Float) = 0.5
_WaveHeight("Wave height", Float) = 0.5
_WaveSpeed("Wave speed", Float) = 1.0
_RandomHeight("Random height", Float) = 0.5
_RandomSpeed("Random Speed", Float) = 0.5
}
SubShader
{

Tags { "Queue"="Transparent" "IgnoreProjector"="True" "RenderType"="Transparent" }
Blend SrcAlpha OneMinusSrcAlpha

Pass
{

CGPROGRAM
#include "UnityCG.cginc"
#pragma vertex vert
#pragma geometry geom
#pragma fragment frag

float rand(float3 co)
{
return frac(sin(dot(co.xyz ,float3(12.9898,78.233,45.5432))) * 43758.5453);
}

float rand2(float3 co)
{
return frac(sin(dot(co.xyz ,float3(19.9128,75.2,34.5122))) * 12765.5213);
}

float _WaveLength;
float _WaveHeight;
float _WaveSpeed;
float _RandomHeight;
float _RandomSpeed;

uniform float4 _LightColor0;

uniform float4 _Color;
uniform float4 _SpecColor;
uniform float _Shininess;

struct v2g
{
float4 pos : SV_POSITION;
float3 norm : NORMAL;
float2 uv : TEXCOORD0;
};

struct g2f
{
float4 pos : SV_POSITION;
float3 norm : NORMAL;
float2 uv : TEXCOORD0;
float3 diffuseColor : TEXCOORD1;
float3 specularColor : TEXCOORD2;
};

v2g vert(appdata_full v)
{
float3 v0 = mul(_Object2World, v.vertex).xyz;

float phase0 = (_WaveHeight)* sin((_Time[1] * _WaveSpeed) + (v0.x * _WaveLength) + (v0.z * _WaveLength) + rand2(v0.xzz));
float phase0_1 = (_RandomHeight)*sin(cos(rand(v0.xzz) * _RandomHeight * cos(_Time[1] * _RandomSpeed * sin(rand(v0.xxz)))));

v0.y += phase0 + phase0_1;

v.vertex.xyz = mul((float3x3)_World2Object, v0);

v2g OUT;
OUT.pos = v.vertex;
OUT.norm = v.normal;
OUT.uv = v.texcoord;
return OUT;
}

[maxvertexcount(3)]
void geom(triangle v2g IN[3], inout TriangleStream triStream)
{
float3 v0 = IN[0].pos.xyz;
float3 v1 = IN[1].pos.xyz;
float3 v2 = IN[2].pos.xyz;

float3 centerPos = (v0 + v1 + v2) / 3.0;

float3 vn = normalize(cross(v1 - v0, v2 - v0));

float4x4 modelMatrix = _Object2World;
float4x4 modelMatrixInverse = _World2Object;

float3 normalDirection = normalize(
mul(float4(vn, 0.0), modelMatrixInverse).xyz);
float3 viewDirection = normalize(_WorldSpaceCameraPos
- mul(modelMatrix, float4(centerPos, 0.0)).xyz);
float3 lightDirection = normalize(_WorldSpaceLightPos0.xyz);
float attenuation = 1.0;

float3 ambientLighting =
UNITY_LIGHTMODEL_AMBIENT.rgb * _Color.rgb;

float3 diffuseReflection =
attenuation * _LightColor0.rgb * _Color.rgb
* max(0.0, dot(normalDirection, lightDirection));

float3 specularReflection;
if (dot(normalDirection, lightDirection) &lt; 0.0)
// light source on the wrong side?
{
specularReflection = float3(0.0, 0.0, 0.0);
// no specular reflection
}
else // light source on the right side
{
specularReflection = attenuation * _LightColor0.rgb
* _SpecColor.rgb * pow(max(0.0, dot(
reflect(-lightDirection, normalDirection),
viewDirection)), _Shininess);
}

g2f OUT;
OUT.pos = mul(UNITY_MATRIX_MVP, IN[0].pos);
OUT.norm = vn;
OUT.uv = IN[0].uv;
OUT.diffuseColor = ambientLighting + diffuseReflection;
OUT.specularColor = specularReflection;
triStream.Append(OUT);

OUT.pos = mul(UNITY_MATRIX_MVP, IN[1].pos);
OUT.norm = vn;
OUT.uv = IN[1].uv;
OUT.diffuseColor = ambientLighting + diffuseReflection;
OUT.specularColor = specularReflection;
triStream.Append(OUT);

OUT.pos = mul(UNITY_MATRIX_MVP, IN[2].pos);
OUT.norm = vn;
OUT.uv = IN[2].uv;
OUT.diffuseColor = ambientLighting + diffuseReflection;
OUT.specularColor = specularReflection;
triStream.Append(OUT);

}

half4 frag(g2f IN) : COLOR
{
return float4(IN.specularColor +
IN.diffuseColor, 1.0);
}

ENDCG

}
}
}

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Shader "Trolltunga/LowPolyWaves 2.0"

{

Properties

{

_Color("Color", Color) = (1,0,0,1)

_SpecColor("Specular Material Color", Color) = (1,1,1,1)

_Shininess("Shininess", Float) = 1.0

_WaveLength("Wave length", Float) = 0.5

_WaveHeight("Wave height", Float) = 0.5

_WaveSpeed("Wave speed", Float) = 1.0

_RandomHeight("Random height", Float) = 0.5

_RandomSpeed("Random Speed", Float) = 0.5

}

SubShader

{

Tags { "Queue"="Transparent" "IgnoreProjector"="True" "RenderType"="Transparent" }

Blend SrcAlpha OneMinusSrcAlpha

Pass

{

CGPROGRAM

#include "UnityCG.cginc"

#pragma vertex vert

#pragma geometry geom

#pragma fragment frag

float rand(float3 co)

{

return frac(sin(dot(co.xyz ,float3(12.9898,78.233,45.5432))) * 43758.5453);

}

float rand2(float3 co)

{

return frac(sin(dot(co.xyz ,float3(19.9128,75.2,34.5122))) * 12765.5213);

}

float _WaveLength;

float _WaveHeight;

float _WaveSpeed;

float _RandomHeight;

float _RandomSpeed;

uniform float4 _LightColor0;

uniform float4 _Color;

uniform float4 _SpecColor;

uniform float _Shininess;

struct v2g

{

float4 pos : SV_POSITION;

float3 norm : NORMAL;

float2 uv : TEXCOORD0;

};

struct g2f

{

float4 pos : SV_POSITION;

float3 norm : NORMAL;

float2 uv : TEXCOORD0;

float3 diffuseColor : TEXCOORD1;

float3 specularColor : TEXCOORD2;

};

v2g vert(appdata_full v)

{

float3 v0 = mul(_Object2World, v.vertex).xyz;

float phase0 = (_WaveHeight)* sin((_Time[1] * _WaveSpeed) + (v0.x * _WaveLength) + (v0.z * _WaveLength) + rand2(v0.xzz));

float phase0_1 = (_RandomHeight)*sin(cos(rand(v0.xzz) * _RandomHeight * cos(_Time[1] * _RandomSpeed * sin(rand(v0.xxz)))));

v0.y += phase0 + phase0_1;

v.vertex.xyz = mul((float3x3)_World2Object, v0);

v2g OUT;

OUT.pos = v.vertex;

OUT.norm = v.normal;

OUT.uv = v.texcoord;

return OUT;

}

[maxvertexcount(3)]

void geom(triangle v2g IN[3], inout TriangleStream triStream)

{

float3 v0 = IN[0].pos.xyz;

float3 v1 = IN[1].pos.xyz;

float3 v2 = IN[2].pos.xyz;

float3 centerPos = (v0 + v1 + v2) / 3.0;

float3 vn = normalize(cross(v1 - v0, v2 - v0));

float4x4 modelMatrix = _Object2World;

float4x4 modelMatrixInverse = _World2Object;

float3 normalDirection = normalize(

mul(float4(vn, 0.0), modelMatrixInverse).xyz);

float3 viewDirection = normalize(_WorldSpaceCameraPos

- mul(modelMatrix, float4(centerPos, 0.0)).xyz);

float3 lightDirection = normalize(_WorldSpaceLightPos0.xyz);

float attenuation = 1.0;

float3 ambientLighting =

UNITY_LIGHTMODEL_AMBIENT.rgb * _Color.rgb;

float3 diffuseReflection =

attenuation * _LightColor0.rgb * _Color.rgb

* max(0.0, dot(normalDirection, lightDirection));

float3 specularReflection;

if (dot(normalDirection, lightDirection) < 0.0)

// light source on the wrong side?

{

specularReflection = float3(0.0, 0.0, 0.0);

// no specular reflection

}

else // light source on the right side

{

specularReflection = attenuation * _LightColor0.rgb

* _SpecColor.rgb * pow(max(0.0, dot(

reflect(-lightDirection, normalDirection),

viewDirection)), _Shininess);

}

g2f OUT;

OUT.pos = mul(UNITY_MATRIX_MVP, IN[0].pos);

OUT.norm = vn;

OUT.uv = IN[0].uv;

OUT.diffuseColor = ambientLighting + diffuseReflection;

OUT.specularColor = specularReflection;

triStream.Append(OUT);

OUT.pos = mul(UNITY_MATRIX_MVP, IN[1].pos);

OUT.norm = vn;

OUT.uv = IN[1].uv;

OUT.diffuseColor = ambientLighting + diffuseReflection;

OUT.specularColor = specularReflection;

triStream.Append(OUT);

OUT.pos = mul(UNITY_MATRIX_MVP, IN[2].pos);

OUT.norm = vn;

OUT.uv = IN[2].uv;

OUT.diffuseColor = ambientLighting + diffuseReflection;

OUT.specularColor = specularReflection;

triStream.Append(OUT);

}

half4 frag(g2f IN) : COLOR

{

return float4(IN.specularColor +

IN.diffuseColor, 1.0);

}

ENDCG

}

Battlemaze

Monthly Archives: November 2015

Custom shaders and shadows

Low poly water shader:evolved

Low poly water shader

A mazing multiplayer game made with Unity

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A mazing multiplayer game made with Unity