Variable Transparency Layer for 3D Mesh Boundary Precision
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Solution Overview
Problem
Existing technologies face challenges in efficiently rendering three-dimensional (3D) volumetric content due to the large amounts of data involved, which can be costly and time-consuming to process, leading to potential distortion in reconstructed representations.
Innovation Solution
The use of a variable transparency layer is introduced, which generates transparency values corresponding to pixels in a depth map to indicate object boundaries, allowing for the rendering of 3D scenes using lower resolution meshes without distorting edges, by making portions of polygons or triangles outside object boundaries transparent.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a higher resolution mesh is used to render objects with precise boundaries, then manufacturing precision of object boundaries is improved, but device complexity and computational resources increase
Solution Approach 1:
The rendering process is segmented into two independent components: a low-resolution mesh structure and a separate transparency layer. The transparency layer is divided into regions corresponding to object boundaries, allowing precise boundary representation without increasing mesh complexity. This segmentation enables the boundary precision to be achieved through the transparency mask rather than through mesh subdivision.
Solution Approach 2:
A transparency layer is introduced as an intermediary element between the low-resolution mesh and the final rendered output. This transparency layer acts as a mediator that carries the boundary information, allowing the mesh to remain simple while still achieving precise object boundaries through the application of transparency values that hide or reveal portions of the mesh.
2Device complexity
If a lower resolution mesh is used to reduce computational resources, then device complexity is reduced, but manufacturing precision of object boundaries deteriorates
Solution Approach 1:
The solution segments the boundary representation function between the mesh structure and the transparency layer. The mesh handles the overall object shape with low complexity, while the transparency layer is segmented into regions that precisely define object boundaries. This allows the mesh to remain simple while boundaries are precisely controlled through the transparency mask regions.
Solution Approach 2:
The transparency values in the transparency layer are adjusted as a parameter to control boundary precision. By varying the transparency values (from fully transparent to fully opaque) across different regions of the transparency layer, precise object boundaries are achieved without changing the mesh resolution. This parameter change approach allows boundary precision to be decoupled from mesh complexity.
3Manufacturing precision
If transparency layers are applied to make portions of polygons transparent, then manufacturing precision of object boundaries is improved, but device complexity increases
Solution Approach 1:
The transparency layer is segmented into distinct regions corresponding to different objects or boundary types in the scene. Each region can have different transparency values, allowing precise control over which portions of the low-resolution mesh are visible or hidden. This segmentation enables boundary precision to be achieved through regional transparency control rather than through complex mesh structures.
Solution Approach 2:
Instead of modifying the original high-resolution mesh data, the solution creates a simplified copy (low-resolution mesh) and uses a transparency layer to reproduce the essential boundary information. The transparency layer acts as a copy of the boundary definition that can be applied to the simplified mesh, achieving acceptable boundary precision without the computational burden of the original high-resolution data.
Data Source
AI summary
A decoding computing device receives a bit stream for compressed volumetric visual content, such as immersive media. The bit stream includes video encoded image frames comprising packed attribute patch images, depth maps for a 3D scene represented by the volumetric visual content, and a variable transparency layer indicating boundaries of objects at different depths within the 3D scene represented by the volumetric visual content. Instead of generating a mesh having a large number of vertices, the decoder generates a lower resolution mesh and applies the variable transparency layer, such that portions of triangles or polygons of the lower resolution mesh extending beyond the boundaries of the objects at the different depths of the 3D scene are made transparent and not shown as being stretched across large depth distances.