A 3-D Rendering System6.111 Final ProjectBen Hebert & Mayur DesaiSpring 2005Project Overview• Implement a 3D Model Rendering System• Two Components:– Rendering and Shading of Models– Output Video to VGA Monitor• Initial Implementation: Simple monochrome polygons• Add features sequentially: camera control, shading, lighting, etc.Block Diagram of Rendering EngineRendering Engine• Transforms the 3-D model into the sequence of pixels that comprise an image.• Rendering consists of a series of matrix transformations to the 3-D Model.• Sequential design that first renders the vertices of a model and then shades it.Rendering (cont.)• Highly Pipelined Design• Can implement more modules in parallel with the shader unit.• Camera Control is implemented by a matrix transformation based upon input.3D Model Format• Model format is Alias Wavefront:g tetrahedron v 1.00 1.00 1.00v 2.00 1.00 1.00v 1.00 2.00 1.00v 1.00 1.00 2.00 f 1 3 2f 1 4 3f 1 2 4f 2 3 4 Simple 3-D Tetrahedron Model in OBJ FormatVideo Component• Responsible for transmitting frames from Rendering Engine to D/A Video Converter• Utilizes a double-buffering scheme with ZBT memories to allow for parallel rendering and video.• Important synchronization issuesBlock Diagram of Video ComponentAddr 20 Camera controlStatus signals 2 (Start/Busy)Data 36 Ctrl 2selectDAC Input24 36 Data bus 136 Data bus 2Ctrl 13ZBTSRAM 1ZBTSRAM 2Input Select/ RegisterADV7125 video DACPixel Clock(@ 40 Mhzfor 800x600 60 FPS)Video Controller FSMRendering Engine and ControlMemory Select3-D Model ROMDouble Buffering of FramesPhase I• Is there video output (without rendered model) 4/22• Is the initial transform functional 4/24• Is there video output showing rendered model 4/27• Simple Shader (Vertices -> White Dots) 4/27• Polygon Shader (including color) 5/1Phase II• Camera Control 5/1• Lighting 5/4• Debugging/Additional Features 5/9Project
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