Certain materials no longer compile in InfiltratorForward with Forward Shading enabled. These materials were not having this compile issue in //UE4/Main @ CL - 3231640 which is the CL before Dev-Rendering integration.
LogShaderCompilers:Warning: Failed to compile Material /Game/Env/Infil1_Courthouse/Material/M_Infil1_City_Courthouse_Statue_Base.M_Infil1_City_Courthouse_Statue_Base for platform PCD3D_SM5, Default Material will be used in game. LogShaderCompilers:Warning: ShadingModels.usf(554,15-81): warning X3571: pow(f, e) will not work for negative f, use abs(f) or conditionally handle negative values if you expect them LogShaderCompilers:Warning: ShadingModels.usf(576,15-55): warning X3571: pow(f, e) will not work for negative f, use abs(f) or conditionally handle negative values if you expect them LogShaderCompilers:Warning: ShadingModels.usf(597,24-66): warning X3571: pow(f, e) will not work for negative f, use abs(f) or conditionally handle negative values if you expect them LogShaderCompilers:Warning: ReflectionEnvironmentComposite.usf(10,15-38): err0r X4510: maximum ps_5_0 sampler register index (16) exceeded
Regression:
Working: //UE4/Main @ CL - 3231640
Broken: //UE4/Main @ CL - 3231696
LogShaderCompilers:Warning: Failed to compile Material /Game/Env/Infil1_Courthouse/Material/M_Infil1_City_Courthouse_Statue_Base.M_Infil1_City_Courthouse_Statue_Base for platform PCD3D_SM5, Default Material will be used in game. LogShaderCompilers:Warning: ShadingModels.usf(554,15-81): warning X3571: pow(f, e) will not work for negative f, use abs(f) or conditionally handle negative values if you expect them LogShaderCompilers:Warning: ShadingModels.usf(576,15-55): warning X3571: pow(f, e) will not work for negative f, use abs(f) or conditionally handle negative values if you expect them LogShaderCompilers:Warning: ShadingModels.usf(597,24-66): warning X3571: pow(f, e) will not work for negative f, use abs(f) or conditionally handle negative values if you expect them LogShaderCompilers:Warning: ReflectionEnvironmentComposite.usf(10,15-38): err0r X4510: maximum ps_5_0 sampler register index (16) exceeded
There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-39734 in the post.