3D viewer : In raytracing mode, the 3D model is displayed incorrectly

Description

3D model is displayed incorrectly

Steps to reproduce

1.Open a PCB.kicad_pcb 2.Open 3D viewer 3.Enter ray trace mode 4.You can see that the model is displayed incorrectly

KiCad Version

Application: KiCad 3D 查看器 (64-bit)

Version: (5.99.0-13185-g0dcbfa2b69), release build

Libraries:
	wxWidgets 3.1.5
	libcurl/7.78.0-DEV Schannel zlib/1.2.11

Platform: Windows 10 (build 19041), 64-bit edition, 64 bit, Little endian, wxMSW

Build Info:
	Date: Nov  9 2021 12:00:58
	wxWidgets: 3.1.5 (wchar_t,wx containers)
	Boost: 1.76.0
	OCC: 7.5.0
	Curl: 7.78.0-DEV
	ngspice: 35
	Compiler: Visual C++ 1929 without C++ ABI

Build settings:
	KICAD_USE_OCC=ON
	KICAD_SPICE=ON