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.
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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" } |
You should consider getting Shader Forge, it is much easier to make shaders in there compared to writing them.
Spending $90 vs. Learning something new for free and doing it by myself. Not as fun!
Your water shaders look pretty awesome! I’m trying to test them out myself but not having much luck.
Could you give a brief overview of how to make use of the shaders?
I tried using it on a plane which gives me some sort of flat wavey effect with two colours which doesn’t look anywhere near like what you have in your video, I’m guessing i’m missing some important steps.
Any help would be appreciated!
Hi, luke! The shader is kind of lacking in features and I guess it’s kind of depending on several thing’s to be “correct”.. the wave generator is a mess and you have to tweak the numbers on your material to get the right look. And I think the plane you use for the water needs to be rotated in the right way in it’s original form to wave on the right axis! I should try to create a unitypackage with a ready built scene or something for you.
A sample scene would be amazing! I wanted to try out your transparent shader with the ripples, but couldn’t see the shader code for that one, would be cool if you had your shaders on github with a sample project setup to use them 😀
Check out the new post, Luke! http://www.battlemaze.com/?p=234