Quad-Tree Atlas Ray Casting: A GPU Based Framework for Terrain Visualization and Its Applications

VdPAs: An Intermediate Data Source for Rendering Dynamic Vectors on Height Field

“…As a rendering target, atlas has the ability to rasterize vector primitives into height field data from multi-resolution tiles, as QTA [6] does. The core idea of QTA is generating a vector gazed height field atlas and then rendering the scenario with data from this atlas.…”

“…In QTA [6], an atlas is generated by projecting the scenario samplers into the screen space of an atlas camera, which contains texels of uniform footprints. In a vertically down view angle, viewport of the atlas camera can be set the same size as current screen viewport of the viewer.…”

“…To implement this goal, we use the atlas cameras described in [6] to rasterize vector primitives and sample height fields. There is a oneto-one correspondence between an atlas camera and a region splits.…”

“…Texture based methods [5] implement real-time vector primitives rendering on height field, but they show poor quality when the viewer moves. Luo [6] proposed a method named Quad-tree Atlases (QTA), which projects vector primitives and height field into an atlas. This method belongs to texture based methods, and it achieves highquality images when the viewer looks vertically down but shows poor quality at grazing view angle, as left sub-figure of Fig.…”

“…In this letter, we present a solution named viewdependent projective atlases (VdPAs), which is inspired by QTA [6]. It has the ability to rasterize dynamic vector primitives and sample height field at the same resolution.…”