Fixed Self Collision Issues and Revised Welcome Scene #38

Job	Run time
build (linux, single, x86_64, template_debug, ubuntu-20.04)	1m 10s
build (windows, single, x86_32, template_debug, windows-latest)	4m 7s
build (windows, single, x86_64, template_debug, windows-latest)	4m 43s
build (macos, single, universal, template_debug, macos-latest)	1m 29s
build (android, single, arm64, template_debug, ubuntu-20.04)	1m 47s
build (android, single, arm32, template_debug, ubuntu-20.04)	1m 34s
build (android, single, x86_64, template_debug, ubuntu-20.04)	1m 38s
build (android, single, x86_32, template_debug, ubuntu-20.04)	2m 57s
build (ios, single, arm64, template_debug, macos-latest)	1m 11s
build (web, single, wasm32, template_debug, ubuntu-20.04)	1m 24s
build (linux, single, x86_64, template_release, ubuntu-20.04)	1m 18s
build (linux, double, x86_64, template_debug, ubuntu-20.04)	1m 18s
build (windows, double, x86_32, template_debug, windows-latest)	4m 25s
build (windows, double, x86_64, template_debug, windows-latest)	4m 15s
build (macos, double, universal, template_debug, macos-latest)	1m 19s
build (android, double, arm64, template_debug, ubuntu-20.04)	2m 7s
build (android, double, arm32, template_debug, ubuntu-20.04)	3m 5s
build (android, double, x86_64, template_debug, ubuntu-20.04)	2m 55s
build (android, double, x86_32, template_debug, ubuntu-20.04)	2m 47s
build (ios, double, arm64, template_debug, macos-latest)	1m 9s
build (web, double, wasm32, template_debug, ubuntu-20.04)	1m 16s
build (linux, double, x86_64, template_release, ubuntu-20.04)	1m 13s
merge	8s
package	23s
	49m 38s

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