Mark all TLAS instances opaque

sergcpp · Apr 6, 2024 · 679d0eb · 679d0eb
1 parent d34b901
commit 679d0eb
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Showing 2 changed files with 2 additions and 5 deletions.
diff --git a/internal/SceneDX.cpp b/internal/SceneDX.cpp
@@ -325,7 +325,7 @@ void Ray::Dx::Scene::Rebuild_HWRT_TLAS_nolock() {
         new_instance.InstanceID = meshes_[instance.mesh_index].vert_index / 3;
         new_instance.InstanceMask = (instance.ray_visibility & 0xff);
         new_instance.InstanceContributionToHitGroupIndex = 0;
-        new_instance.Flags = 0;
+        new_instance.Flags = D3D12_RAYTRACING_INSTANCE_FLAG_FORCE_OPAQUE;
         new_instance.AccelerationStructure = dx_blas.gpu_virtual_address();
 
         // const mesh_t &mesh = meshes_[instance.mesh_index];

diff --git a/internal/SceneVK.cpp b/internal/SceneVK.cpp
@@ -505,12 +505,9 @@ void Ray::Vk::Scene::Rebuild_HWRT_TLAS_nolock() {
         auto &new_instance = tlas_instances.back();
         to_khr_xform(instance.xform, new_instance.transform.matrix);
         new_instance.instanceCustomIndex = m.vert_index / 3;
-        // blas.geo_index;
         new_instance.mask = (instance.ray_visibility & 0xff);
         new_instance.instanceShaderBindingTableRecordOffset = 0;
-        new_instance.flags = 0;
-        // VK_GEOMETRY_INSTANCE_TRIANGLE_FRONT_COUNTERCLOCKWISE_BIT_KHR; //
-        // VK_GEOMETRY_INSTANCE_TRIANGLE_FACING_CULL_DISABLE_BIT_KHR;
+        new_instance.flags = VK_GEOMETRY_INSTANCE_FORCE_OPAQUE_BIT_KHR;
         new_instance.accelerationStructureReference = static_cast<uint64_t>(vk_blas.vk_device_address());
 
         // const mesh_t &mesh = meshes_[instance.mesh_index];