57 results about "Terrain rendering" patented technology

The invention provides a three-dimensional terrain model real-time smooth drawing method with combination of a GPU technology, and belongs to the technical field of image processing. The objective of the invention is to provide the three-dimensional terrain model real-time smooth drawing method with combination of the GPU technology so that cache reuse in multiple times of drawing can be realized based on the current popular programmable GPU technology with a global digital elevation model acting as a data source, and load of computation space is effectively reduced. The method comprises the steps of construction of a multi-resolution pyramid model, elimination of image noise points, filtering of images, partitioning of planar projection of the earth according to equal latitude and longitude, and construction of different hierarchical levels of pyramid layers according to a mode from the top to the bottom. Acceleration and enhancement of terrain rendering are realized based on the programmable GPU technology, i.e. all phases of a graphical drawing pipeline are controlled by using shader languages, two and textures are respectively generated by vertex information and index information of elevation data to be stored in video memory for scheduling of whole terrain drawing; and vertex interpolation and migration are performed in the geometric phase by utilizing a curved surface subdivision and fractal technology so that procedural details are generated and the phenomenon of edges and corners of the terrain mesh when resolution is insufficient can be compensated.

The present invention provides a method, system, and computer program product for managing terrain rendering information. The terrain rendering information includes a data structure of render blocks. The data structure represents a three-dimensional terrain topology of a virtual world with a set of two-dimensional terrain topologies. Each render block includes primitives that define samples of a respective area of terrain to be rendered. A render block manager manages the allocation of render blocks in the data structure based on current reference point information and allocation criteria. Terrain data at higher levels of detail (that is, a greater resolution) is kept closer to the reference point information by adding and removing appropriate render blocks. In this way, appropriate terrain rendering information is maintained efficiently in the data structure during movement of a reference point. Terrain data to be rendered is managed at interactive rates for a large terrain area having a complex shape, such as, a sphere.

The invention discloses a site arrangement construction method using BIM technology, which is characterized in that the site arrangement is divided into three stages: a design stage; simulation phase;an adjustment phase; a design phase. Before construction, carry out two-dimensional site layout; use BIM construction site layout software to optimize the layout; using BIM construction site layout software, combined with site terrain rendering model; setting relevant variables in the whole construction process; simulation stage: simulate in the three-dimensional site layout model, set the time variable in advance, simulate the whole process of construction, check the irrationality of the construction group, adjust the design of the construction group, and form the final version; adjustment stage: combined with the time limit adjustment of the critical line caused by force majeure factors on site, according to the actual progress of the site, optimize the model, adjust the construction group, then simulate, and then adjust, the model runs in PDCA mode, so that the construction group can be optimized. BIM transforms the layout into a visual, intuitive three-dimensional layout, so thatthe space achieves reasonable optimization objectives.

According to one embodiment, a control station includes a heads-down display and at least heads-up display that may be viewed from a single position. The heads-down display is coupled to an unmanned vehicle control system that is operable to control an unmanned vehicle. The at least one heads-up display is adjacent to the heads-down display and operable to operable to display a composite image of the unmanned vehicle's environment. The composite image comprising a rendered image that is generated by a terrain rendering engine.

A multi-resolution texture mapping system suitable for large scale terrain rendering using commodity graphics processing units (GPU). The GPU vertex and fragment shaders are used to implement the clip-mapping functionality. The terrain texture is represented by a combination of a mip-map and a multi-level clip-map having independent origins and off-set values. The independent clip-map levels may be independently updated. The offset values allow the origins to be associated with a reference point in a scene to be rendered. The desired clip-map level to be used to render a particular fragment may be determined using the base 2 logarithm of the maximum screen-space derivative of the source texture required by the terrain geometry to be drawn. If the desired clip-map level is non-integer and lies between two clip-map levels, appropriate texel data is created by interpolating between the bounding clip-map levels. This interpolation allows a multi-resolution texture mapping to be displayed.

A system and method for terrain rendering using a limited memory footprint is presented. A system and method to perform vertical ray terrain rendering by using a terrain data subset for image point value calculations. Terrain data is segmented into terrain data subsets whereby the terrain data subsets are processed in parallel. A bottom view ray intersects the terrain data to provide a memory footprint starting point. In addition, environmental visibility settings provide a memory footprint ending point. The memory footprint starting point, the memory footprint ending point, and vertical ray adjacent data points define a terrain data subset that corresponds to a particular vertical ray. The terrain data subset includes height and color information which are used for vertical ray coherence terrain rendering.

The invention provides a three-dimensional terrain rendering method used for airborne synthetic vision, and aims at enhancing the rendering efficiency of the synthetic vision operating on the resource-constrained embedded platform, enhancing the real-time performance of the synthetic vision system and also meeting the requirements of airworthiness regulations and advisory notices for the synthetic vision system on the aspect of accuracy and security. Usually the airborne embedded platform has limited computing resource and has weaker graphic processing capacity than that of the common consumer electronics so as to be difficult to operate the synthetic vision system of high real-time requirement on the resource-constrained embedded platform. With application of the method, the computing requirement in the synthetic vision rendering process can be reduced, the terrain rendering efficiency can be enhanced, the computing process can be optimized and the terrain rendering accuracy can also be guaranteed. The test platform verifies that the three-dimensional rendering efficiency can be effectively enhanced by the method.

A system and method for terrain rendering using a limited memory footprint is presented. A vertical ray intersects a terrain data map at an angle which includes a minor step size. Weighting factors are assigned to triangular data sampling values and quadrilateral data sampling values based upon a vertical ray's minor step size. As a vertical ray's minor step size increases, a triangular data sampling's weighting factor increases and a quadrilateral data sampling's weighting factor decreases. Weighted triangular data sampling values and weighted quadrilateral data sampling values are combined to generate a vertical ray image point value.

A system for rendering virtual terrain includes an Internet-connected server and software executing on the server from a non-transitory physical medium, the software providing a first function for building a basic terrain from geometric blocks, a second function for analyzing surrounding terrain properties, a third function for adding or subtracting blocks from the terrain, and a fourth function for smoothing the final terrain surfaces.

A method for rendering a real-time conformal view of terrestrial body's terrain being traversed by a mobile platform includes storing digital terrain elevation data (DTED) tiles for at least a portion of the terrain of a terrestrial body into an external removable mass data storage device (ERMDSD). The ERMDSD is connectable to an onboard computer system (OCS) comprising embedded mobile platform components that include at least one processing card, at least random access memory (RAM) device and at least one graphics card. The method additionally includes executing a real-time rendering assist application (RTRAA) stored in the processing card to dynamically repackage the DTED tiles into DTED chunks being representative of an area of the terrestrial body to be traversed (ATBT) by the mobile platform. The method further includes executing the RTRAA to create a base mesh of root diamonds representative of the ATBT and tessellate the root diamonds to create a plurality of leaf diamonds. Further yet the method includes utilizing the graphics card only to render the leaf diamonds, thereby generating a realtime conformal view of the ATBT.