flash

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Hi, im making a 3D Skybox, but i have an issue, the 3D Skybox itself works ingame, but sometimes when looking at the Skybox, my screen flashes black for like not even a second, its really annoying and its not suppose to happen, as far as i can see, i did nothing wrong. I hope somebody knows...

decided to rig the noh mercy mask and animate it for the TF2 jam softwares used: SFM, Flash and After Effects made within 9 hours here's the timelapse

I been gotten this problem years ago during the spray crisis and I don't how to remove it, it effect the waters, props and the textures flash a lot (when i mean flash, i mean it get a bit brighter but not turn pure white.)