想实现一个胸部的动态阴影效果
这种
推测应该是,AO贴图 + 边缘光的算法 + 梯度图lerp。我没用AO贴图(嫌麻烦😄)
相关代码
// falloffhalf normalDotEye = dot( worldNormal, worldViewDir );half falloffU = clamp(1 - abs( normalDotEye ), 0.02, 0.98 );fixed3 rampT = tex2D( _FalloffSampler, float2( falloffU, 1.0f )).bbb;fixed3 falloffSamplerColor = lerp( _RimColor, diffuse , rampT.r);fixed3 combinedColor = lerp( diffuse, falloffSamplerColor.rgb, falloffU);fixed4 rampMask2 = tex2D(_RampMask2, i.uv2);diffuse = lerp(combinedColor, diffuse, rampMask2);
梯度图用的这张
最终效果
差不多是这种感觉
皮肤shader
最后说下皮肤的叠色
fixed3 ramp1 = tex2D(_Ramp, float2(hLambert, _HighColor.a)).ggg;fixed3 ramp2 = tex2D(_Ramp, float2(hLambert, _MedColor.a)).bbb;fixed3 ramp3 = tex2D(_Ramp, float2(hLambert, _LowColor.a)).rrr;fixed3 diffuse = _BaseColor;fixed3 targetColor = lerp(_HighColor, diffuse, ramp1);diffuse = targetColor;if(_MedColor.a != 0){targetColor = lerp(_MedColor, diffuse, ramp2);diffuse = targetColor;}if(_LowColor.a != 0){targetColor = lerp(_LowColor, diffuse, ramp3);diffuse = targetColor;}
就是lerp,一层一层lerp,目前我能想到的就是这样,以后说不定有啥更好的算法