RU2001118221A - Image-based method for representing and visualizing a three-dimensional object and method for representing and visualizing an animated object - Google Patents

Claims (9)

1. A method for representing and visualizing a three-dimensional object, including converting the initial data of a three-dimensional object into an intermediate representation, converting the data of the intermediate representation into a presentation for presentation in the form of a describing cube, each face of which is associated with a multilayer image with depth, and visualization of the resulting representation, while determining the visible faces of the describing cube, taking into account the position of the observer, for each of the visible faces, a multilayer of texture depths and visible edges with texture render. 2. The method according to claim 1, characterized in that when converting the initial data of a three-dimensional object into an intermediate representation, the three-dimensional model is placed in the describing cube, the model is projected orthogonally onto all faces of the describing cube, as a result of which for each face an image of the model with a given pixel resolution is obtained , for each pixel in the obtained images, the corresponding depth value is calculated, which is the distance from a point on the model surface to the corresponding face of the describing cube, as a result those for each face receive a grayscale image, the brightness of each point of which corresponds to the depth at a given point, stores the data of the obtained 12 images in the form of 6 pairs of cards, each pair of cards consisting of a color image and a grayscale image corresponding to the face of the describing cube, and from 6 pairs of maps build a multi-layer image with depth for each facet of the describing cube. 3. The method according to claim 1, characterized in that when converting the source data of a three-dimensional object into an intermediate representation, a multilayer image with depth is obtained and corresponding multilayer images with depth are formed from it for each face of the describing cube. 4. The method according to claim 3, characterized in that when forming multilayer images with depth for each facet of the describing cube, points of the intermediate image are excluded, the angle between the normal at the point and the normal to the face of the cube is less than a predetermined value. 5. The method according to any one of claims 1 to 4, characterized in that when converting for each of the visible faces of a multilayer image with a depth into the texture, the texture sizes are determined depending on the position of the observer relative to the face, the face is divided into quadrants by coordinate axes, the origin of which coincides with the point, which is the orthogonal projection of the observation point onto the face plane, for each quadrant, the direction of the bypass of the multilayer image with the depth along the lines in the direction of the mentioned coordinate origin is determined t and in depth from the points farthest from the plane of the face to the closest points, and during the image traversal, for each of its points, checks are made for the point to get into the resulting texture, if the test is negative, the corresponding image point is skipped and goes to the next point, and if positive as a result of the verification, the coordinates and depths of the image point are converted into the coordinates of the point of the resulting texture, and at the texture point with the obtained coordinates, lat 6. The method according to any one of claims 1 to 5, characterized in that the data of the intermediate representation is used to store information about the model of a three-dimensional object. 7. A method for presenting and visualizing an animated three-dimensional object, including converting the initial data of a three-dimensional object into an intermediate representation, converting data for frames of the intermediate representation into a presentation for visualization in the form of a describing cube, each face of which is associated with a multilayer image with depth, and visualizing the sequence of the resulting representation in this case, for each frame, the visible edges of the describing cube are determined taking into account the position of the observer, for each One of the visible faces transforms a multi-layer image with depth into a texture, and visible faces with texture render. 8. The method according to claim 7, characterized in that when converting the initial data of a three-dimensional object into an intermediate representation, the three-dimensional model is placed in the describing cube, for each frame of the animation, the model is projected orthogonally onto all faces of the describing cube, resulting in an image of the model for each face with a given pixel resolution, for each pixel in the obtained images, the corresponding depth value is calculated, which is the distance from a point on the model surface to the corresponding face a cube, as a result of which a grayscale image is obtained for each face, the brightness of each point of which corresponds to the depth at a given point, the data of the obtained 12 images is stored in the form of 6 pairs of cards, each pair of cards consisting of a color image and a grayscale image corresponding to the face of the describing cube , and from the obtained 6 pairs of maps, a multilayer image is constructed with a depth for each facet of the describing cube. 9. The method according to claim 8, characterized in that the obtained intermediate representations in the form of six video streams are compressed using the compression format of the MPEG 4 standards group, and color channels are used to store color information, and an alpha channel is used to store depth maps.