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Using non-photorealistic rendering for constrained bandwidth OpenGL ES accelerated mobile mapping applications

This paper presents a bandwidth friendly approach to remote rendering of large 3D content (like cities), using Non-Photorealistic Rendering. The original textures of the facade are processed and the feature lines are extracted. The resulting data set (buildings with their characteristic lines) is optimized for remote visualization and stored on the server side. The city is then streamed on-demand on a remote client and rendered using OpenGL ES on handheld devices. This approach is useful for 3D content display on small screens where overly detailed textures can hide the salient characteristic features. It also greatly reduces the amount of data to transmit, making this solution well suited for limited-bandwidth networks like the ones used by mobile devices. Test were run on a DELL Axim X50V with a 624 MHz ARM processor, 64 MB of RAM memory and an Intel 2700G GPU andfull hardware acceleration using OpenGL-ES up to 640x480. Paper available as a PDF.

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