minor change to ray concept, fix include in splatting params file

Author: keptsecret

examples_tests

@@ -55,7 +55,7 @@ NBL_CONCEPT_END(
     ((NBL_CONCEPT_REQ_EXPR_RET_TYPE)((ray.template setInteraction<bxdf::surface_interactions::SIsotropic<bxdf::ray_dir_info::SBasic<float>, typename T::spectral_type> >(interaction)), ::nbl::hlsl::is_same_v, void))
     ((NBL_CONCEPT_REQ_EXPR_RET_TYPE)((ray.initPayload()), ::nbl::hlsl::is_same_v, void))
     ((NBL_CONCEPT_REQ_EXPR_RET_TYPE)((ray.shouldDoMIS()), ::nbl::hlsl::is_same_v, bool))
-    ((NBL_CONCEPT_REQ_EXPR_RET_TYPE)((ray.foundEmissiveMIS(scalar)), ::nbl::hlsl::is_same_v, typename T::spectral_type))
+    ((NBL_CONCEPT_REQ_EXPR_RET_TYPE)((ray.foundEmissiveMIS(scalar)), ::nbl::hlsl::is_same_v, typename T::scalar_type))
     ((NBL_CONCEPT_REQ_EXPR_RET_TYPE)((ray.addPayloadContribution(color)), ::nbl::hlsl::is_same_v, void))
     ((NBL_CONCEPT_REQ_EXPR_RET_TYPE)((ray.getPayloadAccumulatiion()), ::nbl::hlsl::is_same_v, typename T::spectral_type))
     ((NBL_CONCEPT_REQ_EXPR_RET_TYPE)((ray.updateThroughputAndMISWeights(color, scalar)), ::nbl::hlsl::is_same_v, void))

include/nbl/builtin/hlsl/path_tracing/concepts.hlsl

@@ -2,6 +2,7 @@
 #define _NBL_BUILTIN_HLSL_RWMC_SPLATTING_PARAMETERS_HLSL_INCLUDED_
 
 #include "nbl/builtin/hlsl/cpp_compat.hlsl"
+#include "nbl/builtin/hlsl/tgmath.hlsl"
 #include <nbl/builtin/hlsl/colorspace.hlsl>
 
 namespace nbl