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. Z

    3d harmonic oscillator, probability m=0

    Homework Statement The problem asked me to derive an expression for the stationary wave function of the 3d harmonic oscillator which I have done. It then tells me a particle is in the stationary state $$\psi_{n_x,n_y,n_z}(x,y,z)=\psi_{100}(x,y,z)$$ and to express this in spherical coordinates...
  2. Earnest Guest

    How do you project a Sersic Profile into 3D?

    I'm attempting to create a velocity profile for M31. I have a Sersic profile from a paper by Sofue et al (2009), but I'm unable to project it into 3D space in order to get the actual 3D density that I'd use to calculate the velocity at a given radius. Here's the formula from a 2008 paper by...
  3. I

    Calculating Inertia in 3D: What You Need to Know

    Hi! is there anyway to calculate inertia in 3d? for all forms, like we do in 2d, is it the same? https://upload.wikimedia.org/math/d/d/3/dd3b5877d05c86142f03703ac1c6562b.png
  4. S

    3D object represent with primitive shapes

    Hi, Given a 3D object in R3 space can we represent it using three basic primitive shapes like Sphere, Cone and Cylinder? Would this claim be valid?
  5. L

    Find Moment Around A with 3D Vectors: B & C

    Homework Statement A (0,0,0) B(5,6,1) C(3,0,4) |F|= 1919N Homework EquationsThe Attempt at a Solution Cartesian: B= {5i + 6j + 1k} C= {3i + 4k} rCB ={2i + 6j - 3k} |rCB| = sqrt(22 + 62 + 32) = 7 Unit vector = rCB / |rCB| = {2/7i + 6/7j - 3/7k} F = |F| * Unit vector = 1919 {2/7i + 6/7j...
  6. R

    Camera on Airplane: Extrinsic plus Intrinsic 3D Rotations?

    Apologies up front for the long question … I have tried to be brief. I want to define camera angles for Google Earth (GE) when rotated about an aircraft yaw axis. The input is Latitude, Longitude, Altitude plus Heading, Pitch and Bank angles, actually coming from Flight Simulator. These drive...
  7. caters

    What is 3D Slope? Exploring its Calculations

    I know that slope in 2D = $$\frac{\Delta{y}}{\Delta{x}}$$. But what about 3D slope? I mean for every line in 3D there are 3 2D slopes. Those are: $$\frac{\Delta{y}}{\Delta{x}}$$ $$\frac{\Delta{y}}{\Delta {z}}$$ and $$\frac{\Delta{z}}{\Delta{x}}$$ But how do you combine those 3 slopes to form...
  8. J

    Drawing 3D curved arrows around an axis

    Hi, I'm working on a project to illustrate the isometries of a tetrahedron and would like to be able to add a curved arrow around the black axis of rotation in the Manipulate display to indicate which way the solid is rotating depending if the angle is negative or positive. Here's a display of...
  9. D-son

    Is kinetic energy enough to propel objects in 3D space?

    I've recently created a 3D motion generator (Anti-Gravity Transportation (AGT)) in 2D/3D design. unfortunately my current physics knowledge is not advanced enough to take this machine to its maxium potential. i can concieve perpultion and sustainable energy coming from this idea. my question...
  10. A

    Stress due to compression of 3D object

    Good day, I am trying to calculate the stress along the yy-direction for a 3D object compressed in the zz direction (perpendicular to it). The width of the object (in the yy direction) is constant, and the object can only deform along the xx direction. All stresses except for sigma_zz (known)...
  11. R

    Calculating force and work done with 3D vectors

    The question is as follows: An object of mass m=1 follows the trajectory: r(t) = 4 ln(t) i + 6t1/2 j + 2t k Calculate the force acting on the object and hence find work done between t=1 and t=2. I know that Force = Mass * Acceleration Therefore, F(t) = 1 * a(t) I also know that a(t) =...
  12. D

    Geodesic Transport of Small 2D Surface on 3D Manifold

    Hello, I've just read and I think I have understood the following result : If we were to geodesically transport all points of a small 2D surface, so small that it would be flat for all purposes, in a direction vertically above it, and if this surface belongs in an arbitrary 3D manifold, then in...
  13. V

    Ansoft Maxwell - Multi terminal excitation on 3D Transient

    Hello everybody,I am busy with a magnetic transient 3D model and quite new in the use of Maxwell. I am simulating a 6 pulse rectifier in double star connection (connection number 5 as per IEC 146-1-1). Each of the 6 arms of rectifier foresee 8 paralleled diodes. I am interested to see the...
  14. Saracen Rue

    How do I find the gradient of a 3D vector?

    Let's say I have point A(2, 6, 0) and B(3, -1, -2) and wanted to find the gradient of the vector joining these two points. I know how to find the vector representing the line joining these points: OA = 2i + 6j , OB = 3i - j - 2k AB = AO + OB AB = -OA + OB AB = -(2i + 6j) + 3i - j - 2k AB = -2i...
  15. D

    Need to find the source for a 3D Hooke's law equation to cite

    Homework Statement I am using the 3D implementation of Hooke's law as found in wikipedia at: https://en.wikipedia.org/wiki/Hooke%27s_law I need to find the actual source to cite it in a master's project software write up. Many professors do not consider wikipedia to be an acceptable source...
  16. J

    Energy of electron-hole pairs in 3D space

    Dear All: I'm trying to use fluctuation dissipation theorem to describe spontaneous photon emission process by electron-hole recombination in semiconductor material. I notice that all the references using such a method considers the dipole's degree of freedom separately, for example in x, y, z...
  17. D

    Gnuplot: How to plot a 2d colorplot of a 3d function

    Hello, I have a data file created by an C++ Programm which creates the lines of the data file by an operation inside an loop data3dRnd << gsl_vector_get(x,0) << ' ' << gsl_vector_get(x,1) << ' ' << my_f(x,par) << endl << endl; where the entries of the gsl_vector x are doubles and...
  18. J-dizzal

    Static equilibrium 3D, traffic light problem

    Homework Statement The vertical and horizontal poles at the traffic-light assembly are erected first. Determine the additional force and moment reactions at the base O caused by the addition of the three 100-lb traffic signals B, C, and D. Report your answers as a force magnitude and a moment...
  19. Malaxus

    Question about Holograms and 3D mid air images, videos, etc.

    I am very curious about holograms and if there is a possible way to project 3D , mid-air images and videos on air with no holographic screen (The Princess Leia hologram in Star Wars). If it is not possible, how long till they actually start arriving to the world and how will they work/operate?
  20. J

    (Thermo 3D) Power needed to maintain temp

    If we have a cube full of water and glass walls, with an external environmental temperature of 20 degrees celsius, what is the power required to maintain an internal temperature of 25 degrees celsius? Assume sides are 50cm. I don't know what to do, I was trying out the P = (kA/L)(Tf-Ti)...
  21. C

    3D Coordinate transformation and Euler Angles

    Hello, I'm running a galaxy formation simulation. The output specifies the coordinates in (x, y, z) of all the particles in a galaxy, which usually fall in a disk. The orientation of the disk depends on the initial conditions, but it is generally not aligned with any of the coordinate axes...
  22. N

    Exploring the Differences: 3D Nano-materials vs Bulk Materials

    What are the differences between 3d Nano-materials and bulk materials?
  23. Z

    Exploring Dirac Delta Function: Using to Express 3D Charge Distributions

    Hello community, this is my first post and i start with a question about the famous dirac delta function. I have some question of the use and application of the dirac delta function. My first question is: Using Dirac delta functions in the appropriate coordinates, express the following charge...
  24. F

    How can I resolve band assignment issues in 3D simulations using Ansoft Maxwell?

    Hello all, I am anew user for Ansoft Maxwell, I am doing simulation for tubular machine in 3D, I have problem with band assignment, when I run the analysis there is a massage error after the mesh, which said [error] Error in mesh mapping on band, please check the potential problem in band...
  25. S

    [ansys] simulation of permanent magnet in 3D

    Homework Statement The problem is to model a permanent magnet with a torus core .I just wanted to know how to attach attribute of magnet to a volume in ansys 15.0. I solved the problem in 2D but in 3D the results are not satisfactory and I'm not able to point out the mistake by me. the...
  26. S

    [ansys] simulation of permanent magnet in 3D

    I''m facing problem in modelling and analyzing a permanent magnet in 3D. kindly help me out.
  27. E

    Time derivative of 3D Spherical Coordinate

    When we obtain the velocity vector for position vector (r, θ, φ) Why do we take the time derivative of the radial part in the 3D Spherical Coordinate system only? Don't we need to consider the polar angle and azimuthal angle part like (dr/dt, dθ/dt, dφ/dt)?
  28. S

    Calculate Eigen Function of 3D Potential Box w/ Doubled X Side

    Suppose we have a 3D potential box having different length. Now suddenly we double the length of a particular side(Say along X direction) of the box. Can we calculate what will be the eigen function of the Hamiltonian. Is there Time Independent S.E. holds?
  29. N

    How Does Tangential Velocity Relate to Vector Products in Rotational Motion?

    The tangential velocity of a body rotating about the centre point "O" is given by v=w.r, where w is angular velocity and r = radius. give that the vectors w = 3i - 2j + 7k r = 2i + 5j - 3k a) Calculate the magnitude of velocity b) the vector product in the form i+j+k So far I have the vector...
  30. M

    Moment of force from an axis - 3D problem

    Homework Statement An OAB pipe is embedded in O. A cable BC = 1000N and F = ( 0,-f , 0) act on B. Question: Determine the magnitude of the force F as the resultant moment about the axis OA is canceled. Picture in attachment: Homework EquationsThe Attempt at a Solution O=(0 0 0) A=(1.5 0 0)...
  31. G

    Mathematica Plot 3D Mathematica - Graph Not Shown Complete Ubuntu 14.04

    Why if I create a Plot 3D using mathematica 8 the graph is not showed complete unless I hold the graph clicked with the mouse. I'm using Ubuntu 14.04 a weird fact is that in the same computer I have Windows 8 and If I run the program with Windows the graph is shown perfectly. May this question...
  32. M

    3D Physics problem(Forces and Tension)

    Homework Statement metal piece = 300N As this metal piece is in balance, what is the tension in each cable? Picture of the problem in attachment. Homework EquationsThe Attempt at a SolutionW = 300*[0 0 1] D to A: vtda = tda [sin(37), sin(37)*sin(90), -cos(37)] D to B: vtdb = tdb...
  33. N

    MATLAB 3D Finite different method using matlab

    Can anyone show me how to solve the 3D diffusion equation which has been modeled into FDM by using matlab?
  34. S

    Searching for a 3D Wind Tunnel App: PC-Compatible?

    I'm looking for a two element 3D wind tunnel app. Any out there that will run on a PC?
  35. C

    How can I find the equation of a line perpendicular to a plane in 3D?

    Homework Statement How would I find the equation of a line which passes through A(x1, y1, z1) and is perpendicular to A(x1, y1, z1) B(x2, y2, z2), C(x3, y3, z3) Homework Equations Cartesian form of a line in \mathbb{R}^3 The Attempt at a Solution Not sure if this is right but would finding...
  36. E

    Torque Analysis for Electromagnetic Retarder on MAXWELL 3D

    Hello everyone! I have a thesis about electromagnetic retarders. I need to do torque analysis for retarder; but I don't know how to do it on Maxwell 3D. I've tried Eddy Current solition; but analysis results didn't comply to electromagnetic retarder's torque charasteristic. Could anyone help me...
  37. I

    How to convert magnus effect from 2d to 3d?

    I am working on simulating the magnus effect of lift on a spinning ball. Right now spinning on the z axis I can calculate the force effect it has on the x and y coordinates. If I am to add spin on the x do I do the exact same calculations effecting the y and z coords and just add them to the z...
  38. kelvin490

    Can Ampere's law be applied to 3D loop?

    Usually in textbooks Ampere's law is just illustrated using 2D loops which forms a plane. Can the law be applied to 3D loops which cannot form a plane surface within the loop? In a 3D loop which surface should we count when we count the current? In 2D case it is easy because there can only be a...
  39. S

    3d Shape with lowest drag coefficient subsonic ground level

    Hello, What shape has the lowest drag coefficient at ground level and at subsonic speeds (0-150kph) with the following dimensions? Width 60cm (at 45%) Height 120cm (at 45%) Length 220cm These dimensions will fit my motorcycle (not too narrow and not too long). I am thinking it would be a...
  40. Superposed_Cat

    Egomotion 3D: Exploring Algorithms for 2D to 3D Scene Extrapolation

    :ey all, I'm seeking to write an egomotion program and want to do research into existing algorithms and the math of it, but googling "egomotion algorithms" doesn't seem to turn anything up, is there a more popular name for extrapolating 3d scen from 2d scene? Or can anyone post a link? Any help...
  41. Q

    Equation of a line segment in 3D?

    Is there an equation for say a line segment in 3D Cartesian Coordinates that is between these two points? Point One: x=0, y=0, z=0 Point Two: x=5, y=5, z=5 Does it involve inequalities?
  42. A

    How 3D panorama imaging works?

    The fundamental question, what is the reference geometry where images can be fused to form a 3D panorama? In other words, how images are assigned a 3D position? Does it require a gyroscope to be built in camera to define its position per image of the interest? Or just it simply fuses images with...
  43. N

    Find if two triangles intersect in 3D environment

    Hey all, I need to know when two triangles intersect in a 3D environment, given the 3 points. Any help apreciate have been stuck on this for a long time,
  44. davgonz90

    Question About 3D Printing and Cancerous Liver

    With all the hype of 3D printed organs lately, I've wondered: let's say that someone with terminal cancer in the liver undergoes a liver transplant with a completely new 3D printed organ. Assuming that this was the only organ affected, would this rid them of the cancer? If so, why? And if not...
  45. U

    Derivatives in 3D and Dirac Delta

    For a research project, I have to take multiple derivatives of a Yukawa potential, e.g. ## \partial_i \partial_j ( \frac{e^{-m r}}{r} ) ## or another example is ## \partial_i \partial_j \partial_k \partial_\ell ( e^{-mr} ) ## I know that, at least in the first example above, there will be a...
  46. gfd43tg

    Solving 3D Particle in a Box Homework

    Homework Statement Homework EquationsThe Attempt at a Solution a) for ##0 \le x,y,z \le a##, the potential is zero. Therefore, the 3d schrödinger equation is $$ - \frac {\hbar^{2}}{2m} \nabla^{2} \psi = E \psi $$ Is it okay to write 3 equations $$ - \frac {\hbar^{2}}{2m} \frac {\partial^{2}...
  47. DrVirz

    Understanding 3D Solid Deformation: A Cube with No X-Direction Force

    Hi all, Having some trouble getting the final answer on the question below, the fact that the cube doesn't have a force in the x direction is throwing me off. Once I fine the force(??) in the x-direction, I can just use the generalized Hooke's law to obtain strain? Any help is appreciated...
  48. D

    Exploring the Ripple Effect: The Mystery of 3D Shapes

    Why does it look like a ripple on a pond instead of a three dimensional object?
  49. mr.Jelle-Beat

    C/C++ C++ on LPCExpresso-1769 to make 3D pong console

    Hello, PhisicsForumsWe are a group of students from the Avans University of Applied Sciences. We're currently doing a project where we have to design and make a 3D pong console. The idea of the project is to make a "Dedicated Video Game Console" that can be remotely controlled by remotes using...
  50. B

    MHB How Did BENBOBBY Celebrate Pi Day with Animation?

    I created this animation to celebrate Pi Day yesterday and thought Id share it with you guys :) BENBOBBY.
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