Adapt lighting to Intel Sponza.

Author: Adnn

src/apps/ch11_voxel/ch11_voxel/Scene.cpp

@@ -55,6 +55,9 @@ void loadToBuffer(const renderer::EntitiesBlock_glsl & aData,
 //const renderer::ReferencePath gModelPaths[] = {renderer::ReferencePath{"models/pica-pica-mini-diorama-01/sketchfab_gltf/scene.gltf"}};
 //constexpr float gModelScale = 10.f;
 
+// ATTENTION: seems thath the tangent space is in the wrong handedness (LHS) after loading with Assimp
+// Note: Assimpl GLTF2 importer is supposed to apply the handedness factor stored in tangent.w.
+//       We should read the actual tangent data from the file to be certain, but it might be the file is created wrong.
 const renderer::ReferencePath gModelPaths[] = {
     renderer::ReferencePath{"models/Intel_Sponza/pkg_a_curtains/NewSponza_Curtains_glTF.gltf"},
     renderer::ReferencePath{"models/Intel_Sponza/NewSponza_Main_glTF_003-No_Decals.gltf"},

src/apps/ch11_voxel/ch11_voxel/Scene.h

@@ -144,7 +144,7 @@ struct Scene
 
     renderer::LightsDataCommon mLights{
         .mDirectionalCount = 1,
-        .mPointCount = 1,
+        .mPointCount = 0,
         // We decode a sRGB 50% white (which is also perceptually ~50%)
         // to linear space for computation.
         .mAmbientColor = math::decode_sRGB(math::hdr::gWhite<float> * 0.25f),
@@ -157,7 +157,7 @@ struct Scene
                 .mDirection = math::UnitVec<3, float>{ {0.1f, -0.94f, 0.325f} },
                 // TODO: decode the srgb value to have it show correctly in Imgui
                 // (and have it perceptually proportional to the factor)
-                .mColors = renderer::LightColors_glsl{} * 5,
+                .mColors = renderer::LightColors_glsl{} * 8,
             },
          },
         .mPointLights = {