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ShadowGun Sample Level 井日
悝屯月乒田奶伙郔羥趙

絁宒頗扦 Aiming
伉奈玉末白玄它尼失巨件斥瓦失
鐘珧親縑
2012/06/01

赻撩畿賡
? 左件仿奶件必奈丞毛墿爛釬勻化五引
仄凶
? 翋卞扔奈田支籵陓窒煦童絞匹允ㄐ
? 弁仿奶失件玄支 3D 反赻陓卅中匹允

匹手互氏壬勻化賤掊仄引允ㄐ

? 價掛腔卞嗣仁及ロ�反允匹卞荎惤匹
Unity 及 Web 扔奶玄卞堤化中引允
每 http://blogs.unity3d.com/2012/03/23/shad
owgun-optimizing-for-mobile-sample-level/
每 http://blogs.unity3d.com/2011/08/18/fast-
mobile-shaders-talk-at-siggraph/

衙猁

? 犯奈正毛獗化心方丹
? 扑尼奈母井日悝少
? 氾弁瓦永弁毛賤掊仄化心月

Scene 囀犯奈正杅
? GameObject ㄩ 795
? 丟永扑亙(MeshFilter) ㄩ 429
每祥芵隴ㄩ 369
每圉芵隴ㄩ 60

Scene 囀犯奈正杅
? 穴氾伉失伙ㄩ 40
? 扑尼奈母ㄩ 17
? 仿奶玄ㄩ 92
每Directionalㄩ 1
每Point ㄩ91

氾弁旦民乓繹杅
? 64 ℅ 1繹
? 128 ℅ 1繹
? 256 ℅ 7繹
? 512 ℅ 10繹
? 1024 ℅ 10繹
? 2048 ℅ 3繹

氾弁旦民乓蚚芴
? 64﹜128
每嫖及桶政﹜God Ray﹜BRDF LookUpTexture
? 256
每罫劓ㄗ堎﹜刓ㄘ﹜捈﹜散﹜阨醱
? 512
每𡢢砉﹜散﹜う﹜諾﹜NormalMap
? 1024
每𤚗﹜扑乓玄伙﹜族﹜�
? 2048
每族﹜左皮斥尼弁玄蚚失玄仿旦

氾弁旦民乓白巧奈穴永玄
? 64﹜128
每 RGBA 32﹜RGB 16
? 256
每 RGBA 32﹜RGB 16﹜Compressed
? 512﹜1024﹜2048
每 Compressed

禾伉打件杅
? 禾伉打件杅
每黱白伊奈丞ㄩ 20k ? 30k 鏡賒
每𤚗ㄠ极ㄩ廣2k
每 Draw-call ㄩ 30 ? 50
每 Batched ㄩ 120 ? 150

伊件母伉件弘左皮斥尼弁玄杅
? 祥芵隴ㄩ 349

? 圉芵隴ㄩ 49

伊件母伉件弘左皮斥尼弁玄杅
? 祥芵隴ㄩ 349
每 5 意�及穴氾伉失伙匹廣 300
每仇及 5 意�反肮元扑尼奈母
? 圉芵隴ㄩ 49
每 3 意�及穴氾伉失伙匹廣 30

�I燴媆嶲
? physx: 0.3
? animation: 0.3
? culling 0.0
? skinning: 2.6
? batching: 0.7
? render: 1.8
? fixed-update-count: 1 .. 4
? update: 0.2
? fixedUpdate: 0.4
? coroutines: 0.0

�I燴媆嶲
? physx: 0.3
? animation: 0.3
? culling 0.0
? skinning: 2.6 磐�笭中ㄐ
? batching: 0.7
? render: 1.8
? fixed-update-count: 1 .. 4
? update: 0.2
? fixedUpdate: 0.4
? coroutines: 0.0

Case 1
v2f vert (appdata_full v) {
v2f o;
o.pos = mul(UNITY_MATRIX_MVP, v.vertex);
o.uv = v.texcoord;
float3 worldNormal = mul((float3x3)_Object2World, v.normal);
float3 viewNormal = mul((float3x3)UNITY_MATRIX_MV, v.normal);

�萸扑尼奈母
float4 viewPos = mul(UNITY_MATRIX_MV, v.vertex);
float3 viewDir = float3(0,0,1);
float3 viewLightPos = _SpecOffset * float3(1,1,-1);
float3 dirToLight = viewPos.xyz - viewLightPos;
float3 h = (viewDir + normalize(-dirToLight)) * 0.5;
float atten = 1.0 - saturate(length(dirToLight) / _SpecRange);
o.spec = _SpecColor * pow(saturate(dot(viewNormal, normalize(h))), _Shininess * 128) * 2 * atten;
o.SHLighting = ShadeSH9(float4(worldNormal,1)) * _SHLightingScale;
return o;
}

fixed4 frag (v2f i) : COLOR {
fixed4 c = tex2D (_MainTex, i.uv);
c.rgb *= i.SHLighting;

}
c.rgb += i.spec.rgb * c.a;
return c; 白仿弘丟件玄扑尼奈母

Case 2
v2f o;
float3 viewPos = mul(UNITY_MATRIX_MV,v.vertex);
float dist = length(viewPos);
float nfadeout = saturate(dist / _FadeOutDistNear);
float ffadeout = 1 - saturate(max(dist - _FadeOutDistFar,0) * 0.2);
ffadeout *= ffadeout;
nfadeout *= nfadeout;

�萸扑尼奈母
nfadeout *= nfadeout;
nfadeout *= ffadeout;
float4 vpos = v.vertex;
vpos.xyz -= v.normal * saturate(1 - nfadeout) * v.color.a * _ContractionAmount;
o.uv = v.texcoord.xy;
o.pos = mul(UNITY_MATRIX_MVP, vpos);
o.color = nfadeout * v.color * _Multiplier;
return o;
}


白仿弘丟件玄扑尼奈母
return tex2D (_MainTex, i.uv.xy) * i.color;
}

? 白仿弘丟件玄扑尼奈母互閉扑件皿
伙ㄐ

伙ㄐ
每卅兮ˋ

伙ㄐ
每卅兮ˋ
? �呾講毛𦑩日允凶戶
? 疋弁本伙杅 ˇˇˇ �萸杅

? Virtual Gloss Per-Vertex Additive
(Supports Lightmap)
每族午井散
每珨楓妏蚚講互嗣中

Pass {
CGPROGRAM
pragma vertex vert
#pragma fragment frag
#pragma fragmentoption
ARB_precision_hint_faste

fixed4 frag (v2f i) : COLOR
{
???

Pass {
CGPROGRAM
pragma vertex vert
#pragma fragment frag
#pragma fragmentoption
ARB_precision_hint_faste
儕僅毛褫夔卅癹曰邈仄化
fixed4 frag (v2f i) : COLOR
{ 灍俴媆嶲毛傻仁允
月 ???

fixed3 spec = i.spec.rgb * c.a;
c.rgb += spec;
fixed3 lm = DecodeLightmap(tex2D(
unity_Lightmap, i.lmap));
c.rgb *= lm;
return c;
}

fixed3 spec = 隴尨腔卞儕僅毛邈午允
i.spec.rgb * c.a;
c.rgb += spec;
fixed3 lm = DecodeLightmap(tex2D(
unity_Lightmap, i.lmap));
c.rgb *= lm;
return c;
}

儕僅
? fixed
每籵都 11 bit
每 -2.0 ? +2.0
每儕僅 1 / 256
? half
每籵都 16 bit
每 -60000 ? +60000
每儕僅云云方公 3 鳻
? float
每 32 bit

儕僅
? fixed
每籵都 11 bit 厒中
每 -2.0 ? +2.0
每儕僅 1 / 256
? half
每籵都 16 bit
每 -60000 ? +60000
每儕僅云云方公 3 鳻
? float 綈中
每 32 bit

儕僅
? fixed
每伎﹜�g弇矛弁玄伙
? half
每公及坻
? float
每 half 匹儕僅互逋曰卅中午五

儕僅
? 仇氏卅哫晟手匹五引允
每梭棗滄梯﹜鳥梗餃勳喝鳥梯﹜堯勳眶堯梯

儕僅
? 仇氏卅哫晟手匹五引允
每梭棗滄梯﹜鳥梗餃勳喝鳥梯﹜堯勳眶堯梯

丐仁引匹甲件玄匹甩奈玉它尼失卞方勻
化升及儕僅互妏歹木月井綃勻化仁月

鏡賒�
1. 祥芵隴
2. Skybox
每諾﹜華醱
每堎﹜罫劓及刓
3. 圉芵隴

仿奶氾奴件弘
? 仿奶玄
每 Directional ㄩ 1
每 Point ㄩ 91

仿奶氾奴件弘
? 仿奶玄
每 Directional ㄩ 1
每 Point ㄩ 91

伉失伙正奶丞匹�呾卅氏井剠
燴ㄐ

仿奶氾奴件弘
? 噙腔左皮斥尼弁玄
↙ Lightmap
? �腔左皮斥尼弁玄
↙ LightProbe

噙腔左皮斥尼弁玄及仿奶氾奴件
弘

Lightmap
ㄚ
Per Vertex Specular Maps

Per Vertex Specular Maps
1. 氾弁旦民乓及汐卞蔉醱毀扞�僅毛跡
慮仄化云仁
2. �萸扑尼奈母匹旦矢平亙仿�呾
3. 白仿弘丟件玄扑尼奈母匹奻��呾磐
彆午�僅毛𨩆仃化逋允

戊奈玉
???
o.spec = _SpecColor *
pow(saturate(dot(viewNormal,
normalize(h))), _Shininess * 128)
* 2 * atten;
???
�

戊奈玉
half4 frag (v2f i) : COLOR {
half4 c = tex2D (_MainTex, i.uv);
half3 spec = i.spec.rgb * c.a;
�

雄腔左皮斥尼弁玄及仿奶氾奴件
弘

LightProbe
ㄚ
BRDF

BRDF 午反
Bidirectional Reflectance
Distribution Function
ˊ 邧源砃毀扞薹煦票憝杅

BRDF 午反

昜斮及斮覜毛丐日歹允由仿丟奈正
匹﹜
昜斮卞嫖互⻌扞仄化五凶午五卞﹜
升及方丹卞毀扞允月及井�扴仄凶
手及

BRDF
? 岈ゴ卞 LookupTexture 毛釬傖
每 RGB 卞犯奴白亙奈朮
每汐卞旦矢平亙仿
? 仿奶玄午申亙奈源砃井日 LookupTexture 井
日�毛龰腕
? 失伙矛玉午奻��毛�\呾

戊奈玉
void surf (Input IN, inout MySurfaceOutput o) {
fixed4 tex =
tex2D(_MainTex, IN.uv_MainTex);
o.Albedo = tex.rgb;
o.Gloss = tex.a;
o.Alpha = tex.a;
o.Normal = tex2D(_BumpMap,
IN.uv_BumpMap).rgb * 2.0 - 1.0;
}

戊奈玉
ixed4 LightingPseudoBRDF (MySurfaceOutput s, fixed3
lightDir, fixed3 viewDir, fixed atten)
{
fixed3 halfDir = normalize (lightDir + viewDir);
// N.L
fixed NdotL = dot (s.Normal, lightDir);
// N.H
fixed NdotH = dot (s.Normal, halfDir);

// remap N.L from [-1..1] to [0..1]
fixed biasNdotL = NdotL * 0.5 + 0.5;
???

戊奈玉
???

fixed4 l = tex2D (_BRDFTex,
fixed2(biasNdotL, NdotH));

fixed4 c;
c.rgb = s.Albedo * (l.rgb + s.Gloss * l.a) * 2;
c.a = 0;

return c;
}
s.Glossㄗ= tex.aㄘ

Godray
? 禾旦玄皿伕本旦匹灍蚾今木月仇午互
嗣中
? 乒田奶伙匹禾旦玄皿伕本旦反戊旦玄
互詢中

Godray
嗣中
互詢中
每啣禾伉午氾弁旦民乓
每擒褩卞𡛟元化窺苤﹜芵隴僅毛奻仆月

Godray
嗣中
互詢中
每啣禾伉午氾弁旦民乓
每擒褩卞𡛟元化窺苤﹜芵隴僅毛奻仆月
? 賒醱中勻天中卞𣷣互月午�盡互詢中
? 公木勻弔仁�六月凶戶

戊奈玉
v2f o;
float3 viewPos = mul(UNITY_MATRIX_MV,v.vertex);
float dist = length(viewPos);
float nfadeout = saturate(dist / _FadeOutDistNear);
float ffadeout = 1 - saturate(max(dist - _FadeOutDistFar,0)
* 0.2);
擒褩卞𡛟元化及𦑩迉薹毛堤允
ffadeout *= ffadeout;

???

戊奈玉
???

float4 vpos = v.vertex;
vpos.xyz -= v.normal * saturate(1 - nfadeout) * v.color.a
* _ContractionAmount;
�萸毛楊�源砃卞痄�
o.uv = v.texcoord.xy;
o.pos = mul(UNITY_MATRIX_MVP, vpos);
o.color = nfadeout * v.color * _Multiplier;
return o;
}

う
? �萸市仿奈及汐卞餫及荌�毛忳仃月
井毛跡慮仄化丐月
? 奻�午跪意由仿丟奈正毛妏勻化�萸
扑尼奈母匹�呾仄化眻諉�萸及弇离
毛劐載

捈
? 籵都反由奈氾奴弁伙匹釬傖

捈
? 癶籵反由奈氾奴弁伙匹釬傖
? 屾仄匹手幏仁允月凶戶卞
每氾弁旦民乓及 2 笭旦弁伕奈伙
每 �萸市仿奈午皮伊件玉
每傷勻仇及�萸市仿奈毛芵隴卞允月

戊奈玉
v2f o;
氾弁旦民乓釱㻢痄�
o.pos = mul(UNITY_MATRIX_MVP, v.vertex);
o.uv.xy = TRANSFORM_TEX(v.texcoord.xy,_MainTex) +
frac(float2(_ScrollX, _ScrollY) * _Time);
o.uv.zw = TRANSFORM_TEX(v.texcoord.xy,_DetailTex) +
frac(float2(_Scroll2X, _Scroll2Y) * _Time);

???

戊奈玉
???

o.uv.x += sin(_Time * _SineFreqX) * _SineAmplX;
o.uv.y += sin(_Time * _SineFreqY) * _SineAmplY;

o.uv.z += sin(_Time * _SineFreqX2) * _SineAmplX2;
o.uv.w += sin(_Time * _SineFreqY2) * _SineAmplY2;

o.color = _MMultiplier * _Color * v.color;
return o;
}

Sphere Ambient Occlusion
? 丐月萸互升木分仃殑敖今木化中月井
卞𡛟元化�毛勾仃月
? ShadowGun 匹反平乓仿弁正奈及荌匹
妏蚚仄化中月
每 �I逋﹜殈卞ヶ毛离中化公及荌毛芘荌

Sphere Ambient Occlusion

? 卅氏井苤褣仄中宒毛丐木仇木允月
午郔皺腔卞

統蕉揃蹋
? http://www.iquilezles.org/www/articles/spher
eao/sphereao.htm/

void surf (Input IN, inout SurfaceOutput o) {fixed4 tex =
tex2D(_MainTex, IN.uv_MainTex);
o.Albedo = tex.rgb;
o.Alpha = tex.a;

half3 t = _Center.xyz - IN.worldPos.xyz;
half d = 1 / (t.x * t.x + t.y * t.y + t.z * t.z);
o.Gloss = (_Radius * _Radius * d);

WorldNormalVector(IN, o.Normal);
}

戊奈玉
fixed4 LightingSimpleLambertAO (SurfaceOutput s, fixed3
lightDir, fixed atten) {
fixed NdotL = dot (s.Normal, lightDir);
fixed bl = NdotL * s.Gloss;

fixed4 c; 嫖及皮伕永弁薹毛堤允
c.rgb = s.Albedo * _LightColor0.rgb *
(NdotL * atten * 2) * (1 - bl);
c.a = s.Alpha;
return c;
}

引午戶
? StaticBatching 及凶戶卞穴氾伉失伙毛僕籵
趙
? 氾弁旦民乓反磐�卅講毛妏勻化手湮桾痲
每凶分仄㇌窺白巧奈穴永玄ゴ枑
? 噙腔卅仿奶氾奴件弘匹坋煦
? �I燴毛�萸扑尼奈母卞褫夔卅癹曰厥勻化
中仁
每 ˊ 疋弁本伙�g弇匹及�I燴毛𦑩日允
? 扑尼奈母及�呾反儕僅毛邈午允

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Shadow gun及扔件皿伙井日悝屯月乒田奶伙郔羥趙

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