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I am working on geometry 3d type game and I need to know how to bloom my object and also to make gird at background
Here is what you're looking for. https://docs.unity3d.com/Packagesemail@example.com/manual/post-processing-bloom.html
Bloom is included by default with Unity's Post Processing stack. The directions above will get you started. :)
Keep on Creating!
Justin of JustinTime Studios (http://unity3d.expert)