Computer Graphics Stack Exchange
Computer Graphics Stack Exchange

Questions tagged [3d]

Questions and problems dealing with three-dimensional space, including 3D meshes and other data structures, vector math, transformations, etc.

315 questions
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Is there a standard specification for 3D graphic representation?

I'm reading a book on computer graphics, and at some point, it shows a 3D model, created from a .dat file. Here are a few rules for the .dat file creation: Made of a list of vertex positions / faces Written counter-clockwise Faces end with a dot…
Daniel
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How do graphic engine developers debug their 3D graphics code?

I'm currently trying to create an amateur game engine, and I often run into very basic bugs (eg I change the node hierarchy code and suddenly nothing is displayed). Some of the methods I will use include to track down these bugs include: Use my…
Narrateur du chaos
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How to translate mouse movement to a rotation gizmo?

I need to implement translation, scaling and rotation gizmos and I'm having trouble with the rotation gizmo. Basically I don't know how to translate the mouse movement to determine in which direction to rotate the object. By rotation gizmo (widget)…
0xfeedbacc
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What other paradigms exist besides vector/fragment/transform graphics programming?

I am familiar with the basic concepts of writing vector and fragment shaders while using linear transformation matrices to describe orientations in 3D space. But, what other paradigms exist (theoretical or not)?
trusktr
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Earth curvature and horizon in modeling large scenes

If I want to model a large environment, how can I solve the problem of earth curvature and horizon? I use an environment map for the sky, but for the ground what can I do? Do I have to model the ground with a big plane, disk or a spherical cap? Is…
Valerio
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4
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Historically Significant 3D Bicubic Patch Data?

The little milk pitcher / jug in Martin Newell's 1975 PhD thesis “The Utilization of Procedure Models in Digital Image Synthesis”, does anybody have the bicubic patch data for it? The teapot's data (in several early versions) is well-distributed…
KickAir8p
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How does the Waves class in the book Introduction to 3D Game Programming with DirecX11 work?

I'm confused by the Waves class implementation in the source code of the book Introduction to 3D Game Programming with DirecX11: float d = damping*dt+2.0f; float e = (speed*speed)*(dt*dt)/(dx*dx); mK1 = (damping*dt-2.0f)/ d; mK2 =…
Cu2S
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What metrics are used for deciding if a 3D object is visible?

I'm wondering what metrics I could use to decide upon the visibility of a 3D object in VR or other 3D applications and what advantages each has.
Alex
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2
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What are "Triangles" in 3d modeling?

In 3d modeling, there is some "triangle count" which determines complexity. I am not sure but I think cubes have 12 triangles or somethong. But I see NONE. They have squares, no triangles! Can someone please help me understand what a triangle is?…
user11352
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Interpolation of orientations

I have a problem of linear interpolation of CRV (Conformal Rotation Vector) in which CRVs are used to parameterize the orientations. In my knowledge, in order to derive a linear interpolation of orientations, we could apply a conversion from CRV…
Zihan Shen
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Symmetry plane estimation for 3D point cloud

I have a question about finding the symmetry plane that separate the left and the right halves of a point cloud. We scanned an object, say a human face, with a 3D scanner, such as Kinect, which gives a 3D point cloud. Now we want to find the plane…
Ben
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Scaling models for 3D print

So I need to print out this model, however with default sizes, one of the pieces is too large for my printer (M3D). I will need to scale it down.. the question is, do I need to scale the rest of the individual objects (pieces) in the same…
Mike94
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Has the Stanford Bunny ever been re-imaged?

The photographic version shows much more detailed fur than the popular test image.
El-ahrairah
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How does OBJ format determine vertex normals?

I have a very simple obj file: v -2.22045e-16 -0.291306 -2.22045e-16 v -0.24339 -2.22045e-16 -2.22045e-16 v -2.22045e-16 -2.22045e-16 -0.24339 v -2.22045e-16 -2.22045e-16 -0.24339 v 0.24339 -2.22045e-16 -2.22045e-16 v -2.22045e-16 -0.291306…
trisct
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Blend Shape, Pose Blend Shape, and Shape Blend Shape

Since there is a lot of cross-section between computer vision and computer graphics for 3D pose and shape estimation of non-rigid objects, I would like to know what "blend shape", "pose blend shape" and "shape blend shape," exactly mean in 3D…
Mona Jalal
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