Look at this image, it is from the game “Bomb Squad” shared on google play.
How can I make that environment in the back ground?
If your camera doesn’t rotate, you can just use a textured quad.
I’d say “Use a Skybox or a hemisphere sky”.
However, having seen a video of the game, it looks to me as if the background is actually modeled and the camera is using some Depth of Field post-processing?!
Probably the easiest way is to create a ‘3D Skybox’. Basically, you have a second camera that renders a dedicated layer and then create a model on that layer that is your background. The skybox camera needs to match the rotation of the normal camera but otherwise the skybox camera and model never move. Then you composite its image with the normal camera via camera stacking (or whatever your render pipeline of choice uses) and that it. Very similar to how Half-Life 2 did it.
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