What is 3d: Definition and 1000 Discussions

In 3D computer graphics, 3D modeling is the process of developing a mathematical coordinate-based representation of any surface of an object (inanimate or living) in three dimensions via specialized software.Three-dimensional (3D) models represent a physical body using a collection of points in 3D space, connected by various geometric entities such as triangles, lines, curved surfaces, etc. Being a collection of data (points and other information), 3D models can be created manually, algorithmically (procedural modeling), or by scanning. Their surfaces may be further defined with texture mapping.

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  1. S

    I Exploring 4D Wave Propagation in 3D Solids

    I am uncertain if this belongs in the differential geometry thread because I don't know what area of mathematics my question belongs into begin with, but of the math threads on physics forums, this one seems like the most likely to be relevant. I recently watched a video by PBS infinite series...
  2. S

    3d simulation of a rolling ball

    How did you find PF?: Google Hi, I'm looking for advice on how to simulate a golf ball rolling on a green. The green will have been scanned using a 3d scanner by an Engineering Surveyor. I'm trying to model putting a golf ball from any position on the green, looking for a path line to the...
  3. A

    How to calculate the 3D straight line distance between 2 GPS measurements?

    This seems like a trivial question at first, but I am struggling how to get it right. If I have 2 GPS (lat, lon, height) observations P1 and P2 taken at some height from the Earth's surface, how do I calculate the straight line distance between them? I am using the picture below to illustrate...
  4. F

    Tinkercard Digital object and 3D printing

    Hello, When creating a curved object in Tinkercad, something like a sphere, the spheres' surface does not look very smooth but rather meshy under close inspection. Will the 3D printed version of that sphere designed in Tinkercad have a smoother surface than the meshy surface it has in the...
  5. D

    Solving the 3D Poisson equation

    Hello ! I want to solve the 3D Poisson equation using spherical coordinates and spherical harmonics. First I must solve this : ##d^2\phi/dr^2 + 1/rd\phi/dr - l*(l+1)/r^2 = \rho (r)## with ##\phi (\infty ) = 0## (here ##\phi## is the gravitationnal potential and ##\rho## is the mass density)...
  6. E

    3D model I made of the Three Mile Island control room

    This took roughly two months to complete from start to finish. Link to imgur album so that the full-size photos can be viewed. Rendered in 4K.
  7. E

    Here is an interactive 360 degree panoramic photo of a 3D model I made

    Here is an interactive 360 degree panoramic photo of a 3D computer model I made of the RBMK-1000 nuclear reactor central hall. The refueling crane is a work-in-progress. https://www.artstation.com/artwork/A9BAJm
  8. ContagiousKnowledge

    General solution of the spherical wave equation

    Since the spherical wave equation is linear, the general solution is a summation of all normal modes. To find the particular solution for a given value of i, we can try using the method of separation of variables. $$ ψ(r,t)=R(r)T(t)ψ(r,t)=R(r)T(t) $$ Plug this separable solution into the...
  9. F

    Understanding Bed Leveling and Z-Calibration for 3D Printers

    Hello, I am dealing with bed Leveling and calibration (I guess they are the same process) of my new 3D printer and I realized I am shaky on a few basic concepts: Leveling: bed leveling does not mean that the building platform is leveled with respect to the ground, which is what a bubble level...
  10. F

    3D printing software modeling and slicing

    Hello, The first step in 3D printing is the generation of a 3D model using a CAD software. But to be able to print the object, the CAD software is not enough, even if the file is saved in .stl or .obj format, correct? Another software, called the slicer, must then receive the 3D modeling file...
  11. Eagle9

    Advice Needed: 3D Programs for Biological Simulations

    Good day! I need your advice in computer graphics :smile: I have been studying and working in Autodesk 3ds Max for years, mainly for my pleasure. Now I want/need to study some new 3D program in CG, however not for just fun but for science. Particularly I need such program that enables showing...
  12. E

    3D model I created of the largest steam locomotive ever built

    Here is a 3D model (blender 2.8) I created of the Chesapeake And Ohio Allegheny 1601 steam locomotive, which remains today the largest locomotive ever built.
  13. pingu_user

    Misc. How can I calculate the necessary heating power for a 3D printer chamber?

    Homework Statement: heating air in a chamber Homework Equations: heating equations Hi to everyone, I want build a chamber for my 3d printer, the structure is a cube of 0.5m per side. Inside there will be the 3d printer that has a plate of 220mm x 220mm and 3mm thick that stays at a constant...
  14. theycallmevirgo

    Suggested starting points for 3d scanner design

    My school recently got an industrial robot arm with a precision turntable. I was thinking how to use this with some cameras/lasers to make a 3d scanner. Where would you folks recommend I start looking?
  15. N

    Pythagoras 3D: Solve Problems with Ease

    I can do question a but not b nor c. Any help would be greatly appreciated
  16. anorlunda

    Is Ventilation Necessary for Safe 3D Printing?

    :warning: Sigh. Yet another hazard to worry about. You can just order a 3D printer online, plug it in, and start using it. But you shouldn't do that until you provide adequate ventilation.https://www.zdnet.com/article/volatile-compounds-3d-printing-has-a-serious-safety-problem/
  17. GeolPhysics

    I Schrodinger equation for a free particle in 3d space

    I've got the solution to the question but I just need more detail. I can't work out the first step of the solution to the second step. That should read, I don't know what they multiplied ih-bar by to make it (i/h-bar)^2?
  18. E

    What Is the Big Round Thing on Top of a Nuclear Reactor?

    Here is a 3D model I made of a nuclear reactor and reactor core.
  19. Making STRONG shelves with Topology Optimization

    Making STRONG shelves with Topology Optimization

    A project, that's fun, educational, cool-looking and actually useful! What more could you want? We're making topology-optimized floating shelf brackets today...
    • Swamp Thing
    • Media item
    • 3d cad structural engineering
    • Comments: 0
    • Category: Engineering
  20. jedishrfu

    B Is the Milky Way Warped? New 3D Map Reveals Surprising Findings

    https://www.inverse.com/article/58175-study-shows-the-milky-way-is-warped
  21. C

    Electrostatic potential on a 3d object

    How to calculate the eletrostatic potential on a 3d object, for example a ring, if it is charger with some "Q" charge what is the potential on the surface of the ring?And how do i calculate it based on the charge of the ring?
  22. F

    A 3D Heat equation with elementary Dirichlet BC

    Hi, I am looking for the solution of the following heat conduction problem (see figure below): the geometry is the semi-infinite domain such that (x,y)∈R2 and z∈[0,∞[ ; the thermal diffusivity is constant; the domain is initially at a temperature of 0; At t>0, a small square of the surface...
  23. Manasan3010

    3D Animation Software used in Physics Videos by Eugene Khutoryansky

    https://www.youtube.com/channel/UCJ0yBou72Lz9fqeMXh9mkog
  24. J

    The physics behind 3D printing

    Hi, so earlier this week I was given a physics research project for over the summer- I naturally thought to do 3D printing as I have a printer at home. Basically, I’ve got the general idea nailed and I’ve done a fair amount of writing for this, but I need specific physics concepts/ideas or at...
  25. E

    How Was the Iconic Colorado Lounge Recreated in 3D Using Blender?

    This took me almost a month to make. It's a CGI model (blender 2.79) of the Colorado lounge, which is part of the Stanley hotel in Estes Park, Colorado. The room was featured in the 1980 Stanley Kubrick horror film "the shining". I was plumb out of ideas for what to make next in 3D, but I saw...
  26. A

    Time dependent current input in Ansys Maxwell 3D

    Hi guys, I am new to this phorum and Ansys Maxwell as well. I am trying to pass as an input a time dependent current, but I really do not know how to do it. Does anyone know how to fix this issue? Cheers, Alessio
  27. Mcp

    Why is a Hexagonal Prism Used as the Unit Cell for 3D HCP?

    My textbook states that all the 14 bravais lattices have one of the 7 types of parallelepiped (7 crystal systems) that can be used as an unit cell. However in case of 3D HCP textbooks don't talk about this parallelepiped, rather they consider a hexagonal prism as the unit cell. Why is it so...
  28. E

    Here is a 3D model I made of the RBMK reactor control room

    Summary: The new HBO miniseries inspired me to use blender 3D to re-create the Chernobyl control room. The HBO miniseries about Chernobyl inspired me use a 3D modeling program called Blender to re-create the RBMK-1000 reactor control room of the Chernobyl nuclear power plant. It's about 95%...
  29. D

    3D Statics problem: Box on an inclined plane constrained by a rope

    Hello Got a following problem. 300N Box on a frictionless inclined plane. The plane itself is in the Z-direction. Box is held by a rope AB and a force in the direction Z. Determine the tension in the rope and the force F. The answers to this problem are 104N and 215NMy question is where do i...
  30. S

    B Is 3D reality merely an illusion?

    Hi, everyone! I read an online article, some time ago, on the Holographic Universe, and how it might operate. According to the author, quantum bits, or"qubits"of information exist on the surface of a cosmological horizon. Complex interactions between these qubits result in them becoming...
  31. M

    Export a 3d surface movie with good quality

    Hi PF! I have a 3D surface that changes with time. I am trying to make a movie. The following is what I do, but the output is extremely low quality. Does anyone know how I can get the same quality that Mathematica uses for its images? mov[t_] := Show[ParametricPlot3D[{(2 + Cos[v]) Cos[U]...
  32. S

    Given a force in 3d what is the resulting force and torque?

    I'll preface this by saying I've done these sorts of problems before (though it was only in 2d) in my statics and dynamics class. I have no idea where my book went and the major problem I'm dealing with is vocabulary, so if I say something that doesn't make sense, please let me know, I've almost...
  33. J

    Comp Sci Computing the Length & Area of a 3D Triangle

    I have computed the total length of a 3D triangle and its area. The code is shown below. I want to use file output instead of cout. The file name, cw2task1output, was just given as part of the task, in this case should I make an empty text file named cw2task1output then attach it to the resource...
  34. A

    3D Printed Gear Tooth strength

    HI guys, I am in the middle of a project where i have 3d printed ABS & PLA spur gears, I am looking to do gear teeth strength calculations however I am not sure how to apply the formulas. This is because of the layered structure and the infill % of the prints. Ill appreciate all help. Thank you
  35. J

    In what direction does a light wave vibrate?

    I've wondered this for a while but not known how to ask the question, If light is a transverse wave, then what is it transverse to? To elaborate, light travels in three-dimensions, radially. To me, this seems analogous to the sound wave, with pulses of pressure moving longitudinally to the...
  36. C

    3d interpolation in Python using a mesh grid

    I have four arrays of data xvalues[], yvalues[], zvalues[] and wvalues[] and I want to create, from this data, an interpolated function w = f(x,y,z). Is it easy to do this in python using first a meshgrid and then calling scipy's interpolation? e.g toy set up is something like, where wvalues...
  37. sbleuz

    I The use of 3D reconstruction techniques to build a galaxy model

    I'm learning about imaging techniques and projection/deprojection for images of galaxies at university. The big issue there is the fact that an image is a 2D representation of a 3D object (for example a galaxy), and to learn some properties of the object you need the 3D structure. What happens...
  38. Spinnor

    I Set of possible rotations of a 3D object and the rotation history

    I am trying to understand the picture below which is of a contractible and uncontractible loop in what I would call (proper name?) "rotation space", where "rotation space" is a solid ball of radius π with opposite points on the surface of the ball identified, each point of the ball representing...
  39. G

    Modeling a mass hanging by a spring: motion in 3D time/freq domain

    Hello everyone, I am new here, and wondering if anyone would have some knowledge on a current problem I have been working on. I am trying to create time- and frequency domain 3D models of an object hanging using a spring from a fixed point within a shell. I am trying to figure out how the...
  40. A

    Mixed intrinsic and extrinsic angles in 3D rotations

    Being scratching my head for 2 days and not getting anywhere with this one. I am trying to figure out how to perform a 3D rotation described via a mix of intrinsic and extrinsic angles. Here is the problem: I have a platform in the shape of a box with sides of length lx, ly and lz. The platform...
  41. A

    I Invert a 3D Fourier transform when dealing with 4-vectors

    I am having trouble following a step in a book. So we are given that $$\varphi (x) = \int \frac {d^3k}{(2\pi)^3 2\omega} [a(\textbf{k})e^{ikx} + a^*(\textbf{k})e^{-ikx}] $$ where the k in the measure is the spatial (vector) part of the four-momentum k=(##\omega##,##\textbf{k}##) and the k in the...
  42. E

    New metal gear 3D model in Blender

    Hi, it's been a long time since I've been on these forums, but here is a new 3D blender model that I spent four weeks of daily work to finish. I'm glad it's done, it wasn't easy. This is metal gear RAY, a 70-foot tall robot from the popular video game franchise metal gear solid.
  43. QuasarBoy543298

    I Understanding 3D Coordinate Rotations with Euler Angles

    I'm trying to wrap my head around the concept. we use 3 rotations to transfer our regular cartesian coordinates (3 x,y,z unit vectors) to other 3 unit vectors. each rotation is associated with an angle. so far I'm good. but now I saw in Landau's and Lifshitz's "mechanics" book this thing...
  44. X

    Max Shear Stress in 3D Stress State?

    Hi, there's no particular question I need help on - just a few things I need clarifying. To determine the max shear stress, I know max shear stress = (max normal stress - min normal stress)/2, but are these equations true for a 3D stress state? (please look at attached image) Thank you
  45. Krushnaraj Pandya

    What happens when the denominator is 0 in a 3d line equation?

    Homework Statement I noticed that for a line parallel to z axis the equation is (x-a)/0 = (y-b)/0 = (z-c)/k = t. Homework Equations Any 3d geometry equations The Attempt at a Solution I can't quite grasp how to visualize this, also I can't see any constant like a 2d line parallel to x-axis...
  46. M

    3D Equillibrium Statics Problem - Reaction Forces/Moments

    Hello, it has been quite some time since my statics class, and I am having a problem determining the reaction forces and moments in a rigid body. I have included a sketch of my problem, and I am hoping someone can help guide me to a solution. I apologize if the sketch is a bit crude.I have a...
  47. K

    I The allowed energies of a 3D harmonic oscillator

    Hi! I'm trying to calculate the allowed energies of each state for 3D harmonic oscillator. En = (Nx+1/2)hwx + (Ny+1/2)hwy+ (Nz+1/2)hwz, Nx,Ny,Nz = 0,1,2,... Unfortunately I didn't find this topic in my textbook. Can somebody help me?
  48. Krushnaraj Pandya

    Efficient solution to a 3D geometry distance problem

    Homework Statement Find the coordinates of those points on the lines (x+1)/2 = (y+2)/2 = (z-3)/6 which is at a distance of 3 units from the point (1,-2,3) 2. Relevant methods 1) assume a point, use distance formula- (very calculative) 2) write vector equation of line, find foot of...
  49. Krushnaraj Pandya

    Faster ways to calculate distance between a point and a line in 3D

    Homework Statement Suppose a line is given, say (x-3)=(y-2)=z in Cartesian form and we are supposed to find a point on it which is at a distance say, 6 units from a given arbitrary point (1,2,3). 2. Relevant tedious methods 1) write line in vector form then equate modulus of vector between...
  50. J

    B How do you create a + and π sign using multivariable (x,y,z)

    I am taking a high school multivariable calculus class and we have an end-of-semester project where we trace out some letters etc., except that they all have to be connected, continuous and differentiable everywhere. My group's chosen to do Euler's formula, but so far we are having problems...
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