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A parallelized screen-based method for rendering polylines and polygons on terrain surfaces
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DOI：10.1016/j.cageo.2016.10.011.png)
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Abstract
En 中文
Two dimensional (2D) vector features, when rendered on terrain as reference or highlight features, can improve the intelligibility of three dimensional (3D) scenes. This research proposes a new screen-space based method to render solid color 2D polylines and polygons on terrain. Using the z-buffer value and window coordinates in screen space, a pixel's spatial extent in real world coordinates can be calculated. The pixel's color is changed, if its spatial extent intersects with a polyline or polygon feature, to reflect the fact that there is a polyline going through or a polygon covering the pixel. Compared to other existing methods, our method eliminates undesirable rendering artifacts. A parallel computing schema was proposed and implemented as well to improve rendering performance.
Keywords:
Virtual geographical environment
3D cartography
Rendering technique
Screen-based rendering
Image line combination
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