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Questions tagged [model]

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0
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1answer
22 views

How does the Modified Phong Lighting Model from the Phong Lighting Model?

How does the Modified Phong lighting model also known as the Blinn-Phong differ from the Phong Lighting Model? How can I distinguish the two?
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0answers
35 views

Has anybody extended parametric surfaces to volume density representations usefully?

Current mainstream technology does not really model the density functions very well. Yeah, we can use volumetric grids, FEM, voxel representations and particle clouds that define densities. But these ...
3
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1answer
72 views

Infinitely long 3D model

Let's say that I want to render something like Dimmadome's hat, a hat which has the height of infinity. A quick answer to this would be to place the top side of the hat high enough for the crown(...
2
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1answer
76 views

Path Tracer - Model loading Libraries?

so I am in the process of making my own GPU path tracer based on OpenCL as part of my bachelor thesis. I have already made a CPU and a GPU ray tracer based on OpenGL compute shaders but all I have ray-...
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0answers
41 views

Is this the correct application of model transformation?

Suppose I want to perform translate in the following order: Scale by $S$ Rotate by matrix $R_1$ Rotate by matrix $R_2$ Translate by $T%$. When I apply the matrix, should the overall transformation ...
1
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1answer
64 views

Technology for specific project 3d in c#?

I want to write a program that allows me to simulate the effect of wind on a decorated 3d tree standing outdoors (rocking ornaments and decorations, falling balls, etc.). The program should allow to ...
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0answers
225 views

3D model outline using stencil buffer

I'm trying to outline a 3D model in WebGL. I've tried using a stencil buffer techique with glLineWidth and glPolygonMode. However, Mozilla's WebGL reference says that the minimum and maximum widths of ...
1
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1answer
243 views

Hooke's Law vector form

I'm studying spring model. There is a suggested equation (Hooke's Law vector form) But, I couldn't understand how to derive that equation. I'm reading 'Computer Animation Algorithms and Techniques ...
2
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1answer
321 views

Most efficient way to render many OO meshes in OpenGL

I am writing a large 3D game in Java with OpenGL. Question #1 As of now, I am rendering my 3D objects using a Model class that I defined. This class contains ...
2
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0answers
37 views

How to create a noise model with a constant PSNR?

My goal is to create a noise model so that the PSNR of the noisy image compared to the original is some pre-defined constant $\alpha$. This means the mean squared-error will also be a constant. My ...
4
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1answer
512 views

Bevel/Chamfer algorithm for arbitrary 3D mesh

I can't find any paper about a bevel/chamfer algorithm for 3D mesh. Bevel has a lot of special cases (corners, different bevel profile, bevel larger than a face). I am looking for robustness. Do you ...
5
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1answer
95 views

How does a rigged model work?

What black magic is behind this? Starting from a pile of polygons, a skeleton, and an initial conformation, how is a new conformation turned into a new pile of polygons?
5
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2answers
124 views

Implement own Bend function

I'm trying to write a mesh deformer that bends a Cube around an axis like this: The bend degree in figure A is 90 and something like 35 in B. So if I know my desired bend degree how can I get alpha? ...
1
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1answer
81 views

How to convert image results into data?

I have made an 3d solar exposure analysis for a 3d city model that determines how long a surface receive direct sunlight throughout the year. Results are coloured surfaces and legend of coloures that ...
4
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0answers
142 views

OpenSCAD Hull/Minkowski function by hand?

I am trying to model an organic object using OpenSCAD. However this will need to be ported over to older software. This restricts the primitives I can use (only cone, cylinder, torus, sphere and cubes)...
11
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1answer
252 views

Why smoothed meshes in 3D studio end up with the same number of vertices/triangles? How then can they be smoothed with the same geometry?

I am trying to understand why meshes that are smoothed in 3D studio (Modifiers/Smoother) end up having the same amount of vertices/faces before or after that process, as well as the exact same ...
3
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1answer
4k views

What algorithm(s) are behind Google Street View's 3d mapping mode?

I recently noticed that in some locations you could switch to a 3d mapping mode in Google Street View. Which algorithm(s) did they use to generate the 3d models of the streets? I assume it was more ...