Yingcai Xiao Voxel Game Engine Development. What do we need? What tools do we have? How can we design and implement? We will answer those questions in.

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Presentation transcript:

Yingcai Xiao Voxel Game Engine Development

What do we need? What tools do we have? How can we design and implement? We will answer those questions in an agile way. Game Engine Development

What do we need?

Video Game: Interactive animation Input Device Driver Display Device Driver (GDI) Display Device Driver (GDI) Game (Software)

Video Game: Interactive animation Similar to all other programs: data, algorithms, input, output. Data: Game Objects Algorithms: Animation Input: Interactive Events Output: Display

Voxel Based Game Engine

Game Objects (GO) Conversions to indexed meshes:

Game Objects (GO) Convert a uniform grid into an indexed mesh. O(0,0,0) D(1,1,1) 2x2x2

Voxel based game engines: VoxelVoxel: volume element, the smallest unit in a 3D space partitioning. Strictly, it is a block in uniform grid or hexahedral network. Broadly speaking, a pyramid in a tetrahedral network can be considered as a voxel too. e/ e/

Volume Representation Voxel based volume representation: Hexahedral / Tetrahedral Meshes Volume Deformation Volume Deformation code: VolDefo

Voxel based game engines? Or not! Ray casting engines may not be voxel engines if the ray stops at the surface of game objects.Ray casting engines may not be voxel engines if the ray stops at the surface of game objects. Outcast is not really voxel based. It just uses surface-based Ray Casting, not volume based ray casting.Ray Castingvolume based ray casting. The Voxel Space engine / Comanche (series), ray casted terrain for flight simulation.Voxel Space Comanche (series)

Voxel based game engines? Or not! The Voxel Space engine / Comanche (series), ray casted terrain for flight simulation.Voxel Space Comanche (series) ehttp://en.wikipedia.org/wiki/Wolfenstein_3D_engin e clideon-teases-photorealistic-voxel-based-game- engine (laser scanned 3D surface) clideon-teases-photorealistic-voxel-based-game- engine

Tools for future Voxel-based game engines: VTK: open source voxel-based volume rendering library

Game Objects (GO) Attributes: Appearance color, normal, transparency, texture, bumpy map, normal map, …

Game Objects (GO) Physical Properties: rigid (fixed geometry) deformable (changeable geometry) breakable (changeable topology) intangible (no defined geometry) roughness, friction, reflection and refraction coefficients, weight, …

Animation Keyframe: Most commonly used. Need to provide GUI for entering the keyframes. Procedural: For advanced physical simulation. Tracking live actor: Can be modified and saved.

Input Devices CLI: Command Line Input Keyboard based GUI: Graphical User Interface Mouse, touch screen, … NUI: Natural User Interface Kinect, Leap Motion, …

Output Hardware: Video Controller Graphics Card (2D/3D) GPU (graphics processing unit, a dedicated processing unit for rendering 3D graphics)GPU GPGPU (general purpose GPU, mostly used as servers for high performance computing / HPC) Printers (2D / 3D)

Output Software: GDI: Graphics Device Interface OpenGL (WebGL, OpenGL-ES)OpenGL OpenCL / Vulkan for GPUVulkan ActiveX 3D