Method and system for displaying and navigating an optimal multi-dimensional building model
Visualizing three dimensional content is complicated by display platforms capable of more degrees of freedom to display the content than interface tools have to navigate that content. Disclosed are methods and systems for displaying select portions of the content and generating virtual camera positions with associated look angles for the select portions, such as planar geometries of a three dimensional building, thereby constraining the degrees of freedom for improved navigation through views of the content. Look angles can be associated with axes of the content and fields of view.
1. A method of visualizing three dimensional content, the method comprising:
retrieving a three dimensional (3D) building model from computer memory;
calculating a first main axis of the 3D building model by grouping lines of the 3D building model within an angular threshold of one another and selecting the group with the largest sum of weighted edge length for the grouped lines;
defining a look angle for each of at least two planar geometries of the 3D building model, the look angle based on at least the first main axis of the 3D building model;
generating a plurality of virtual camera positions associated with the defined look angles; and
navigating the 3D building model by displaying the 3D building model from the generated plurality of virtual camera positions.
2. The method of claim 1 , wherein the planar geometry is a roof.
3. The method of claim 1 , wherein the planar geometry is a façade.
4. The method of claim 1 , wherein the 3D building model further comprises a second main axis.
5. The method of claim 1 , wherein generating the plurality of virtual camera positions comprises calculating a lower optimal view and top optimal view of the least two planar geometries for each of a positive and negative direction of the first main axis.
6. The method of claim 1 , wherein generating a virtual camera position further comprises determining an optimal camera view.
7. The method of claim 6 , wherein determining an optimal camera view comprises determining a building field of view.
8. The method of claim 7 , wherein the building field of view comprises at least one of the planar geometries.
9. The method of claim 8 , wherein determining an optimal camera view further comprises applying a buffer zone around the planar geometry.
10. The method of claim 8 , wherein determining an optimal camera view further comprises centering the planar geometry in a field of view of the virtual camera.
11. The method of claim 1 , wherein navigating the 3D building model further comprises receiving a selection of a virtual camera position associated with at least one of the planar geometries.
12. The method of claim 11 , further comprising displaying the 3D building model from the look angle of the selected virtual camera position.
13. A system for visualizing three dimensional content, the system comprising:
a display;
computer memory; and
a processor operatively coupled to the display and computer memory for generating views of a three dimensional (3D) building model, the processor configured to:
retrieve a 3D building model from the computer memory,
calculate a first main axis of the 3D building model by grouping lines of the 3D building model within an angular threshold of one another and selecting the group with the largest sum of weighted edge length for the grouped lines;
define a look angle for each of at least two planar geometries of the 3D building model, the look angle based on at least the first main axis of the 3D building model,
generate a plurality of virtual camera positions associated with the defined look angles, and
navigate through the plurality of virtual camera positions of the 3D building model from different perspectives in the display.
14. The system of claim 13 , further comprising an interface operatively coupled to the processor and display, the interface configured to receive a selection of a virtual camera position associated with at least one of the planar geometries, and the display configured to present the 3D building model from the look angle of the selected virtual camera position.
15. The system of claim 13 , wherein the at least one planar geometry is a roof.
16. The system of claim 13 , wherein the at least one planar geometry is a façade.
17. The system of claim 13 , wherein the 3D building model at further comprises a second main axis.
18. The system of claim 13 , wherein the processor is configured to generate the plurality of virtual camera positions by calculating a lower optimal view and top optimal view of the least two planar geometries for each of a positive and negative direction of the at least one axis.
19. The system of claim 13 , wherein the processor is further configured to generate a virtual camera position by determining an optimal camera view.
20. The system of claim 19 , wherein the processor is further configured to determine a building field of view for an optimal camera view.
21. The system of claim 20 , wherein the building field of view comprises at least one of the planar geometries.
22. The system of claim 19 , wherein determining an optimal camera view comprises determining a buffer zone around the planar geometry.
23. The system of claim 19 , wherein determining an optimal camera view comprises centering the planar geometry in a field of view of the virtual camera.