Cdx Error 0x3 1 Exclusive -

Two placed resources within the same heap ( D3D12_HEAP_TYPE_DEFAULT ) are accessed simultaneously – the heap itself requires exclusive access per allocation.

CDX-ERR-0x3-1-EXCL Date: [Current Date] Severity: Medium (Application/Driver Level) Affected Systems: Windows 10/11, DirectX 12 applications, graphics debugging tools (PIX, RenderDoc), GPU drivers (NVIDIA, AMD, Intel). cdx error 0x3 1 exclusive

Add an explicit transition to D3D12_RESOURCE_STATE_EXCLUSIVE_WRITE (custom state) or ensure proper state promotion: Two placed resources within the same heap (