compute transition time instead of using constant

[tcm390]

Now we are using constant for fade-in transition time which cause the latency of fade-in effect that is because we add the model to the scene before the effect is finished. In this pr, I compute the transition time instead of using constant.

issue:

https://user-images.githubusercontent.com/60634884/215914217-41bf4cca-88fa-43dc-bb37-42958fee2f23.mp4

result:

https://user-images.githubusercontent.com/60634884/215914234-d7ee5336-b47e-48b4-b918-542f93c96064.mp4

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Name	Status	Preview	Updated
character-creator	✅ Ready (Inspect)	Visit Preview	Feb 1, 2023 at 0:22AM (UTC)

[gonnavis]

Confirmed with @tcm390 and tested that , this PR tweaked the time, prevent heavy calculation cause page stuck when particles still exist.