Questions tagged [subdivision]

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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 ...
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2answers
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Rounding a 3D corner with Subdivisions

Following the instructions from this post on Stack Overflow, I have been able to find points A, B, and C from points V1, V2, and V3 and a radius value (code below). I would like to be able to find a ...
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1answer
75 views

Approximating Geodesics in a half edge DS, how can I refine my mesh to get good approximations

I implemented Djikstra's shortest path algorithm to approximate Geodesics on arbitrary meshes. Djikstra's works, but I noticed a problem inherent to the discretization of my meshes. Consider the ...
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0answers
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C++ code to subdivide skinny 3D triangles into more regular triangles

I am currently in the search for a C++ function that takes a triangle and some input control data (e.g. max area) and returns a list of triangles that are as equilateral as possible. I know there are ...
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0answers
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Loop subdivision, certain areas converging towards degenerate geometry

I coded loop subdivision and ran it on a cube with triangle faces. I noticed this: I am using doubles to represent my vertex positions, I am not 100% sure these are caused by floating point ...
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1answer
106 views

How do people come up with subdivision schemes?

Be it chaikin subdivision, loop subdivision, catmull-clark subdivision... How do people come up with the coefficients for an arbitrary subdivision scheme?
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1answer
121 views

If you can use subdivision surfaces for 2D curves

I've seen how subdivision surfaces are good for 3D curves/modeling, but haven't seen anything on if it's good, or even usable, in 2D. My question is just that, if (a) you can even use subdivision ...
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1answer
294 views

Problems with Subdivision Surfaces

It sounds like Subdivision Surfaces are better than NURBS but not as good as T-splines. I would like to know some of the disadvantages of Subdivision Surfaces, what they can't do or what they do ...
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0answers
46 views

Ray tracing and mesh extraction

I have been reading this paper : 3D Surface Extraction using Incremental Tetrahedra Carving .pdf I have already generated a tetrahedra for my mesh and I would like to create a surface mesh. I can't ...
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1answer
345 views

How to smooth out a voxel grid?

So I am facing the following issue. Say I have a minecraft like mesh (i.e I have a bunch of cubes on top of one another). I wish to smooth out this mesh in such a way that only the regions where ...
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1answer
356 views

Visualizing the Lane-Riesenfeld Algorithm

Ok so, I keep reading papers about this and non of them have pictures. The lane Riesenfeld algorithm provides a way to subdivide set of points with B-spline conversion. The quesiton is simple HOW? If ...
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2answers
273 views

Where do the coefficients in the Catmull-Clark subdivision algorithm come from?

I'm learning about subdivision surface algorithms. The "Catmull-Clark" algorithm seems to be one of the most widely-used classical algorithms. The introduction of new face points and edges is ...
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1answer
381 views

B-Spline patches on the tessellation shader. How to get the control points

I have a polygonal mesh with ngons in it. I want to make a tessellation shader to which I send only the regular quads in such a way that it can construct a B-Spline surfaces across it. I came across ...
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1answer
158 views

What is this triangle sub-division scheme called?

I have thought of a triangle sub-division for the purpose of smooth triangulation (no popping) over time on the fly. I think it is very likely the scheme is already invented and has a name but I can´t ...
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0answers
31 views

Constructing base mesh for required subdivision surface

Given a triangle mesh, does there exist any algorithm to compute a base mesh (smaller in size than the triangle mesh) that could be subdivided multiple times to get back the original mesh (or an ...
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0answers
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An introduction to Lane-Riesenfeld algorithms [closed]

I am looking for a good introduction to Lane-Riesenfeld algorithms, which are a family of subdivision methods for generating uniform B-splines. Any suggestions? Note. This is a copy of the question I ...
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1answer
400 views

What subdivision algorithm advances have occurred since Catmull-Clark?

In 1978 Edwin Catmull and Jim Clark defined the recursive subdivision process that bears their names, and although those principles are applicable still today, what advances have occurred as far as ...