Questions tagged [model]

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Purpose and workflow of wireframe models

I am more less familiarized with the major computer graphics concepts up to certain dregree of "low-levelness". So I know how models, vertices, polygons etc. and how these works. Also how is ...
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Which geometry file format is the most similar to our geometry file format?

To represent a 3D geometry in our software we use this format below: Material-1 Material-2 P1(X1,Y1,Z1) P2(X2,Y2,Z2) P3(X3,Y3,Z3) This 11 point gives us a triangle with the description of what is ...
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Character Creation. Cartoon look, Eyes and Extra Parts. What advantages are the combining to one mesh?

I am fairly new to CG and 3d art. I'm trying to learn to make good game assets (ie. Low poly count, clean looking) in a cartoon style. I'm making this character as pictured. But his eye is a separate ...
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1 answer
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Why are these 2 buffers joint while extracting glTF information?

I am using tinyGLTF to parse gltf files and then render them in my program. I am currently during the third example in this page. In particular I am trying to extract the 2 animation buffers: My code:...
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Vertices, Vertex Normals and Face Normals

Using Open 3D Model Viewer, I have converted an OBJ file to an STL file. In the source file, the Vertex Normals are specified and in the destination, the face normal of the triangles are present which ...
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Retaining hierarchy of assembly when converting STEP to GLTF

I want to convert STEP files to gLTF. I know that gLTF suuports hierarchy of assemblies and parts. Source: https://cadexchanger.com/blog/283-how-to-load-3d-cad-data-into-three-js-part-2 However, it is ...
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2 votes
1 answer
37 views

Wondering if it's possible to 'extend' a texture beyond the mesh without altering the mesh itself

I'm in Blender and working with a pre-existing 3D model- I want to add more length to it, but I don't want to mess with the mesh- Is it possible to extend the texture beyond the mesh without changing ...
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What's a good research topic in Computer Graphics?

I am currently trying to find topics for my master's thesis. I would really like to do something in the field of computer graphics, but I've been having trouble finding what are some current problems ...
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1 answer
326 views

OpenGL Render front and back faces with different shading for 3d modeller

I'm working on a simple 3d modeller and I would like to render the back facing triangles a bit darker, to easier differentiate between front and back faces. Like you can see in most modelling ...
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1 vote
1 answer
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Terminology: Volumetric Model

I am reading a paper TileGAN: Synthesis of Large-Scale Non-Homogeneous Textures available here, and in the section entitled Selected Applications of GANS (i.e. applications of Generative Adversarial ...
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After making any 3D model using Opengl how to export it's data in .dae file?

I'm trying to make simple 3d modeling program in c++ with Opengl. So I don't know how to transfer/convert/export or save data of 3D model in .dae file. NOTE:- 3d model is made using Opengl ...
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Transformation for aligning 3D object with reference frame of 3D turtle graphics

The problem I'm using a 3D extension of the well-known "Turtle graphics" to draw plants. My system works by maintaining a position $\vec{p}$ and three vectors: The heading $\vec{H}$ The "up" ...
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Apply a pose to a 3D model/mesh

Assuming that I have pose information for a human, is there any ways/tools to apply that pose to a 3D model? Basically, given continous pose information say from a dancing person, I like to animate a ...
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2 votes
1 answer
95 views

How to handle quads?

I currently can not solve a ray-quad intersection with a quad that bends, because it is impossible to solve (because really a quad can't/shouldn't bend). Sadly, often times, models with ...
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Where to find BRDF textures

I've read about measured BDRFs and models like cook-torrance have parameters that need to be set. It isn't hard to imagine that these parameters and the measured properties would vary from point to ...
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0 answers
108 views

How to model braids?

Many hair simulations render their hair as lines (usually splines). Since hair is a really thin object. if the hair is braided, rather than having thin infinitesimally small cylinders, you have ...
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1 vote
1 answer
112 views

Export Model Textures Per Face

(Note that as far as attempts go, I can't find anything that helps me) I have a 3D polygon, and for simplicity's sake it's going to be the one below: It is textured using the UV map below: Side ...
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1 answer
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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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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 ...
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3 votes
1 answer
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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(...
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2 votes
1 answer
98 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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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 ...
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1 answer
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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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1 vote
0 answers
451 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 ...
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1 vote
1 answer
1k 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 ...
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3 votes
1 answer
968 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 vertex,...
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2 votes
0 answers
52 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 ...
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3 votes
1 answer
2k 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 ...
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4 votes
1 answer
146 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?
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4 votes
2 answers
296 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? ...
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0 votes
1 answer
90 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 ...
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4 votes
0 answers
212 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)...
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13 votes
2 answers
415 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 ...
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  • 263
2 votes
1 answer
5k 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 ...
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