A Unity ID allows you to buy and/or subscribe to Unity products and services, shop in the Asset Store and participate in the Unity community.
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The modeling versus code and logic? I was wondering as we design tools for 3D gaming level design use without much real world game design...
For building, skyscraper and city layouts for fast concept designs generated in SketchUp Make Free version or Pro:...
All these detailed tips are good. But also think of the color and texture (light/shade,etc) design of the spaces you are in and transitioning into...