Is 2D+3D=2.5D?
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Bioengineering, Free Full-Text
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terminology - What is a 2.5D environment? - Game Development Stack Exchange
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What are the best tools to create a 2D/3D (2.5D) game in Unity3D? (ala Kirby Triple Deluxe) - Unity Forum
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Advanced Packaging - from 2D, 3D to 4D packaging
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Are you Team 3D, 2.5D or 2DS/2DO? - 3D InCites
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Comparing 3D, 2.5D, and 2D Approaches to Brain Image Segmentation
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New Paradigms in ASIC: 2.5D and 3D ICs, Product Engineering Blog
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The design comparison between monolithic 2D and interposer-based 2.5D
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What are the best tools to create a 2D/3D (2.5D) game in Unity3D? (ala Kirby Triple Deluxe) - Unity Forum
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Advanced Packaging - from 2D, 3D to 4D packaging
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Making 2.5D Game in Unity – Part 1 - General and Gameplay Programming - Tutorials