Detail-in-context terrain displacement algorithm with optimizations
First Claim
1. A method for generating a presentation of a region-of-interest in a terrain data representation for display on a display screen, comprising:
- translating each point of the representation within a lens bounds to a rotated plane being normal to a vector defined by a position for the region-of-interest with respect to a base plane for the representation and an apex above the base plane, the lens bounds defining a shoulder region at least partially surrounding a focal bounds defining a focal region in which the position is located, each point having a respective height above the base plane;
displacing each translated point from the rotated plane by a function of the respective height and a magnification for the focal region, the magnification varying across the shoulder region in accordance with a drop-off function;
rotating each displaced point toward a viewpoint for the region-of-interest to maintain visibility of each displaced point and each point of the data representation beyond the lens bounds when viewed from the viewpoint; and
, adjusting each rotated point corresponding to the shoulder region to provide a smooth transition to the data representation beyond the lens bounds.
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Abstract
A method for generating a presentation of a region-of-interest in a terrain data representation for display on a display screen, comprising: translating each point of the representation within a lens bounds to a rotated plane being normal to a vector defined by a position for the region-of-interest with respect to a base plane for the representation and an apex above the base plane, the lens bounds defining a shoulder region at least partially surrounding a focal bounds defining a focal region in which the position is located, each point having a respective height above the base plane; displacing each translated point from the rotated plane by a function of the respective height and a magnification for the focal region, the magnification varying across the shoulder region in accordance with a drop-off function; rotating each displaced point toward a viewpoint for the region-of-interest to maintain visibility of each displaced point and each point of the data representation beyond the lens bounds when viewed from the viewpoint; and, adjusting each rotated point corresponding to the shoulder region to provide a smooth transition to the data representation beyond the lens bounds.
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Citations
18 Claims
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1. A method for generating a presentation of a region-of-interest in a terrain data representation for display on a display screen, comprising:
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translating each point of the representation within a lens bounds to a rotated plane being normal to a vector defined by a position for the region-of-interest with respect to a base plane for the representation and an apex above the base plane, the lens bounds defining a shoulder region at least partially surrounding a focal bounds defining a focal region in which the position is located, each point having a respective height above the base plane;
displacing each translated point from the rotated plane by a function of the respective height and a magnification for the focal region, the magnification varying across the shoulder region in accordance with a drop-off function;
rotating each displaced point toward a viewpoint for the region-of-interest to maintain visibility of each displaced point and each point of the data representation beyond the lens bounds when viewed from the viewpoint; and
,adjusting each rotated point corresponding to the shoulder region to provide a smooth transition to the data representation beyond the lens bounds. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A system for generating a presentation of a region-of-interest in a terrain data representation for display on a display screen, the system comprising:
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a processor coupled to the display screen; and
,modules executed by the processor, the modules including;
a module for translating each point of the representation within a lens bounds to a rotated plane being normal to a vector defined by a position for the region-of-interest with respect to a base plane for the representation and an apex above the base plane, the lens bounds defining a shoulder region at least partially surrounding a focal bounds defining a focal region in which the position is located, each point having a respective height above the base plane;
a module for displacing each translated point from the rotated plane by a function of the respective height and a magnification for the focal region, the magnification varying across the shoulder region in accordance with a drop-off function;
a module for rotating each displaced point toward a viewpoint for the region-of-interest to maintain visibility of each displaced point and each point of the data representation beyond the lens bounds when viewed from the viewpoint; and
,a module for adjusting each rotated point corresponding to the shoulder region to provide a smooth transition to the data representation beyond the lens bounds. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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Specification