All Questions
Tagged with algorithm computational-geometry
38
questions
1
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0
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26
views
How to morph a enclosing mesh according to the enclosed mesh?
I am quite new to meshing and mesh manipulation. I am working on a problem consiting of meshes $A$, $B$, and $C$. The mesh $C$ completely encloses the meshes $A$ and $B$ as shown in the attached ...
- 11
1
vote
1
answer
142
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Constructing half-edges table from triangle list without hash
Motivation
I am trying to refine a mesh such that each triangle gets subdivided into 4 triangles, but I want the vertices to be shared. For that purpose I need a half-edge data structure so I can ...
- 2,226
0
votes
1
answer
114
views
Extrapolating geometry across a triangle mesh?
Say you have 2 parametric cylinders represented as triangle meshes with very different geometries and you connect them together.
Is there a method that allows you to join them together such that the ...
- 1,736
1
vote
0
answers
64
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Piecewise smoothing of a mesh?
Kobbelt et al. published a paper some 20 years ago where they specified how solving Poisson equations on the positions of a mesh lead to removing noise. This can be used for reconstructing mesh ...
- 1,736
0
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0
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20
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How is re projection usually implemented in remeshing?
I was reading "Polygon Mesh Processing" and in chapter 5 the authors present this little algorithm:
...
- 1,736
2
votes
1
answer
58
views
What is a smart way to fill in the 'next' pointer of a opposite half-edge of a boundary?
I was reading this question regarding half edges from 3 years ago and the selected answer seemed pretty smart to me. However, while actually implementing it I'm confused at the part where I have to ...
0
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0
answers
68
views
What algorithms are typically used for finding 'PCB Trace'-like paths?
I am analyzing a large amount of Layers 0-4 Network Data. I am trying to render diagrams dynamically showing the Network Devices involved in the data (Desktop, Switch, Router, Server, etc.) and how ...
- 101
4
votes
2
answers
856
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Can you explain to me the Bresenham's line algorithm in simple terms?
I've been trying to wrap my head around this algorithm, and I need it for my drawing function. But I can't seem to understand it.
The Wikipedia page gives this piece of code right at the end:
...
- 41
1
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0
answers
47
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Algorithm for transforming PNG anti-aliasing to smooth paths
I read the pixels of PNG files via libpng and creates an array of alpha channels (showing visible pixels for a monochromatic image).
int pixels[height][width];
<...
- 131
4
votes
2
answers
299
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results of Curved PN-Triangles algorithm has visible edges
I implemented the curved PN triangles algorithm described in this paper to smooth geometry in real time. After the implementation was finished (in glsl) I realized, that this algorithm smooth the ...
- 1,299
3
votes
0
answers
43
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Is this way of transforming QMC samples into barycentric tri coordinates agnostic to mesh-topology?
While I'll try my best to give all relevant info in all possible brevity below, please refer to the spoiler and link at the bottom of the post for the (more lengthy) original description if needed.
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2
votes
0
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55
views
Divide mesh according to level of detail
Background
I need to remesh by OpenVDB, like what Blender remesh does:
Voxel
Uses an OpenVDB to generate a new manifold mesh from the current geometry while trying to preserve the mesh’s original ...
- 133
6
votes
1
answer
107
views
Existing method to automatically fill in this sort of concavity in meshes?
I am working with a PWP3D-like algorithm that renders silhouettes of a mesh in order to segment a frame of video and update an object's pose. Because it is only the silhouettes of the mesh that matter,...
- 91
0
votes
1
answer
43
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Differential or intersection of islands of 2D polygons in different layers
I have a 2D layer/section containing the 2D polygons colored in shades of green.
I have another layer containing the 2D polygons colored in shades of blue.
I intend to figure out how different are ...
- 133
1
vote
1
answer
77
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Subdivision scheme where the faces and edges have weights (not necessarily scalar weights)
Subdivision schemes work by considering the vertices and their connectivity information to calculate averaging weights.
However, other than specifying which vertices are connected, and perhaps which ...
- 1,736