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. PicassoCT

    Exploring the Potential of 3D Printing Plasma Structures in Midair

    Hi everyone, i recently saw some videos were a microwave laser (gaser) was used to create a plasma in midair. So the first part of my question is, if you could handle the ray fast enough, could one print 3dimensional-layered plasmastructures into non-disturbed atmosphere? If no, what did i not...
  2. CivilSigma

    Finding the resultant of two forces in 3d

    Hi, For the following image, we have to calculate the resultant of those two forces. I have broken them down to their components. Did I do this correctly because when I actually solve for the force I am not getting the correct answer of 940N in the back of my book. Also, I tried calculating the...
  3. K

    How to develop a Parabolic Velocity Profile in 3D tube/channel flow

    i am trying to develop a Parabolic Velocity Profile in 3D tube/channel flow. for the 2D case i use u = 1.5*Um *(1-(2y/H)^2) where Um= fluid velocity y = position of solid on "y" axis (x,y) H = width of channel The above equation is not possible to used for 3D case (x,y,z). i try to...
  4. S

    Finding the E due to a non-uniform surface charge distribution in 3D

    Homework Statement Here is the question, which itself is rather confusing. A nonuniform surface charge lies in the yz plane. At the origin, the surface charge den- sity is 3.5 μC/m^2. Other charged objects are present as well. Just to the right of the origin, the electric field has only an x...
  5. I

    MHB Where Can I Find Four Points on an Elliptic Paraboloid Graph?

    graph the elliptic paraboloid $4x^2+y^2-z=0$. find four distinct points on the graph this is the graph. do i just find four random points now that lay on it?
  6. B

    Why Does the Gradient Behave Differently in Cylindrical Coordinates?

    So my question is regarding the gradient of a function. Suppose we have a function expressed In cylindrical coordinates. Its expressed as z=rcos2@ I expressed the equation in cylindrical, but for the sake of my logic I'll now talk about it in cartesian. It appears that dz/dx and dz/dy at...
  7. T

    Classical Mechanics - Moving Object in 3D space

    Homework Statement Hello, i have the following task, which should actually not be too hard, but for for some reason i cannot figure out the answer. Consider an Object with 1 kg mass in 3D space with coordinates \vec r = [x(t), y(t), z(t)]. Like Shown in the attachment, z:= e^{ax} and...
  8. K

    Looking for 3D printing and Milling services

    Hello! I currently have a machine fully designed to fold newspaper and place rubber bands on them, yet I do not have a way to create the parts themselves! I ask of anyone if they know of a service where I can send a CAD drawing (specifically Autodesk Inventor) and have them mill or print the...
  9. S

    Mathematica: Illustrate a 3D vector field

    Homework Statement Hi, Firstly, let me apologize if this is not exactly the right topic to ask this questions. But since it is homework and since most of the Physicists for sure illustrate a 3D vector field, I decided to post it here. Attached I have two files with 3D vectors. How does...
  10. lordnitro

    Help with 3D Vector Non-Orthogonal Walls Problem

    Hello everybody, so I've just joined, thought maybe you guys could help me out since I've been banging my head against my desk for a few days now. http://imgur.com/4FVpan3 (incase the inline image doesn't work: http://imgur.com/4FVpan3) I'm stuck on problem 1.38. I know how to do it if the...
  11. Q

    Differential Geometry book on 3D Euclidn space - worth reading?

    I bought a book (Differential Geometry by Kreyszig) based on really good reviews because I'm planning to learn general relativity later. I guess I didn't pay enough attention to the description because apparently it's completely focused on "three-dimensional Euclidean space." Will this book...
  12. T

    Representing Continuous Space in a Computer: Managing Lattices and Accuracy

    How can we translate real-world positions into a computer language? An example would be to simulate a ball bouncing around in a closed box. How can we say with confidence that the program will represent reality? This is my current thinking on how to manage space. Any advise or critique...
  13. A

    Trying to calculate Orbit figures with C# and 3D space

    Hello smart people! I am trying to make a simulation of an orbit with C#. I have come so far that I more or less only need a way to convert the apoapsis, periapsis and ascending node to 3D space vector3's. If it is possible, I want to avoid longitude and latitude? Anyone have any suggestions...
  14. B

    Calculating Resultant Force of F3 in 3D Space

    Homework Statement If the coordinate direction angles for F3 = 650lb are α = 110∘, β = 25∘ and γ = 76∘, determine the magnitude of the resultant force acting on the eyebolt. FIGURE: Homework Equations ? The Attempt at a Solution ? New semester, and so happy to start with a...
  15. A

    Modelling of a curve in 3D space

    i'm looking for a curve that would have a shape of a snowdrop (the white spring flower) in 3D space. i have tried some sine and cosine functions but they don't give me the right shape. if anyone knows how solve this problem feel free to comment :) (i have tried f(x,y)= sin (x*x + y*y)/(x*x +...
  16. M

    Revolutionize Your Projects with 3D Ultrasonic Sonar on Arduino

    I'm working on arduino based project, that actually can perform 3 features: 1. Virtual Touch Screen, for remote control purposes big screen TV, projectors, public display, or for interactive games 2. 3D Ultrasonic Radar, small range - 3 m for now, but real time with update rate 50 fps; 3...
  17. J

    What causes circular rainbow patterns when using 3D glasses and LCD screens?

    Hi, I was looking through a pair of 3D glasses last night at my mobile phone screen and saw something really cool. If the screen is lit and you tilt it, at various angles you see a circular rainbow effect. The different colours all form perfect circles around each other. I have been trying to...
  18. I

    MHB Comparing 3 Points on a 3D Graph

    excuse my TERRIBLE drawing but roughly, is this drawing a good representation of the points? A(-4,0,-1) B(3,1,-5) C(2,4,6) in my drawing i have the axis as 2, 4, 6 etc
  19. T

    3D Computer Animation to Physics?

    I have a BFA in computer animation and currently work in that field, specifically game development. Since I was in high school, I've had an interest in Physics. Lately, I started brushing up on my math (the highest level I took in college was Precal) and decided that I wanted to start studying...
  20. V

    Create Stunning 3D Graphics with an Evening 3D Graphic Editor

    Evening... I`m looking for some kind of graphics editing software, allowing to draw 3D sketches and view them through anaglyph glasses (blue-red). The main purpose is just to assist my imagination in solving 3D geometry problems, so I prefer it to be as simple as possible. It would be great...
  21. L

    Plane & 3D Vector Homework Solution

    Homework Statement problem 1: given the straight line r whose equation is r=<3+2t, 4+2t, -1-t> 0.Determine A, intersection of the plane yz 0.1the parameter value at A is t= 0.2therefore A=(...,...,...) 1.we want to re-parametrize r (be u the new parameter) so that: 1.1the new...
  22. maverick280857

    Why is Lorentz Group in 3D SL(2, R)?

    Hi, While reading "Superspace: One Thousand and One Lessons in Supersymmetry" by Gates et al. I came across the following paragraph: Maybe I haven't understood what exactly they're trying to say here, but 1. Why is the Lorentz Group SL(2, R) instead of SL(2, C)? 2. Why is the two-component...
  23. N

    Is Spacetime Fabric Truly 2D or Just a Visual Representation?

    I've always been interested in Space-Time fabric and have been trying to get a clear answer to whether or not its an actual fabric that's two dimensional or is that an easier way of understanding it when talking about gravity and matter and how Space-Time is effected. If it really is 2D, why?
  24. M

    Math or Physics for 3d graphics/simulations

    I'm having a hard time figuring out which major, math or physics, would be more suited to do 3d graphics/simulations given a reasonable amount of computer science courses/self study. A math degree has a lot of useful courses like numerical analysis, combinatorics, and discrete math which I'm...
  25. S

    Creating 3d coordinates from stereoscopic images

    Hi, I'm working on a project that would take a 3d image using stereocopic camera and would record the depth and the 2d (x1,y1) , (x2,y2) coordinates of a single point in the image. The depth is found using the focal point, disparity, and the distance between the difference the camera sees on...
  26. M

    Questioning 3D Model views of effect of large bodies on curving space.

    Hi everyone. I am not a physicist or scientist but this is a question I have pondered for a while now. Everytime I see a model of how large bodies (eg Earth and sun) bend the planar representation of space (creating a "cup" or "dip") I always feel that this is not completely representative...
  27. C

    Silicon droplets and double slit, in 3D?

    So Yves Couder have these silicon droplets bouncing on a vibrating surface of some liquid: ...and apparently they can produce some things quantum particles do, like double slit fringe pattern trick. The question is how does that translate to 3D and would it still work? I mean, instead of...
  28. I

    Is the Planck Length a 3d area?

    If so, is 'its half' also not a real size of space? What I am asking is pretty much; what is the meaning of the notion of a 'smallest possible' 3d area? What is the meaning of that cusp between 2d and 3d? Almost like asking what is in between 1.999999999999(repeating) and 2. Must...
  29. nicolauslamsiu

    How can the bond angle of a molecule be determined using its formula?

    How to determine the bond angle based on the formula of molecules?
  30. O

    Software for 3D geometry illustrations?

    Dear all, I am looking for an interactive software that can let me play with 3d geometry. I apologize, as I am not sure of the right technical term of the sorts of shapes I am interested to work with. I am not a mathematician or physicist, but rather use these as philosophical metaphors and...
  31. LotusPond_14

    Oserving wave behaviour Is it 2d, 3d, or is there something more?

    :confused: HI, is wave behaviour on a two dimensional field or in a multidimensional field in space?? i am currently conducting a study whether the object producing the wave is actually spinning and the resultant disturbance on the field it is residing causes the field to respond to the...
  32. S

    Understanding 3D Rotation Transformations

    Hello, First time posting to Physics Forums. I have been thinking about rotation transformations and am a bit confused on how trig works in 3D. In 2D, convention says the positive x-axis points to the right, the positive y-axis points upward, and positive angles are measured from the...
  33. Superposed_Cat

    XNA 3d how get models primitives

    Hi ll, I am currently working on 3d in xna. i have ismple collision detcetion working but I want to do triangle by triangle collision detection.How would I get a models base triangles? I have this adapted from online to fit in with my game: public struct TriangleVertex {...
  34. R

    Is it possible to convert 2D coordinates of point to 3D form ?

    Hello everyone ,i have captured car positons at differents frames.http://www.imagesup.net/pt-7140205392313.png%5D%5BIMG%5Dhttp://www.imagesup.net/dt-7140205392313.png Suppose car's(left side car which is coming towards us) centroid is at video frame1 is P(x1,y1) and Q(x2,y2) at video frame4...
  35. J

    Can polynomial functions be determined in 3D using given points and coordinates?

    If given three points ##P_0 = (x_0, y_0)##, ##P_1 = (x_1, y_1)## and ##P_2 = (x_2, y_2)##, the polynomial function ##f(x)## that intersect those points is ##f(x) = a_2 x^2 + a_1 x^1 + a_0 x^0##. where: ## \begin{bmatrix} a_0\\ a_1\\ a_2\\ \end{bmatrix} = \begin{bmatrix} x_0^0 &...
  36. R

    Moment Coefficient for a 3D Rotating Cylinder

    Hi, I'm looking for the Moment Coefficient (Cm) for a 3D Rotating Cylinder, this means, I there is a free stream of fluid and there is inmerse a cylinder rotating about its own axis , and also rotating about an axis parallel to the free stream. I found in the book of Peter Childs, called...
  37. T

    3D Graphene foam from glucose by chemical blowing

    I'm a third year physics undergraduate and I want to make 3D Graphene - without spending a fortune. This is my background: I found this review article by Jiang and Fan (Design of advanced porous graphene materials: from graphene nanomesh to 3D architectures) to be very helpful. From what...
  38. M

    Mathematica Mathematica - How to make 3D plots flat

    Hello, I've been using mathematica the past few days and quite like it. I am trying to add some figures to my word document. Because of the size of the exported emf file from mathematica, I am unwilling to have a document that is 100MB in size. So I was searching for some ways to export...
  39. L

    Resolving 3D Forces for Determining xyz Components

    Hi, I am trying to resolve a force into xyz components and I think I'm getting a bit confused. When viewed face on the force is 35 degrees from the horizontal. When viewed from above the force is at 12 degrees from the horizontal (not sure if one would refer to it as the horizontal but see...
  40. carllacan

    Particle in 3D Box: Wavefunctions and Energies

    Homework Statement A particle is constrained by walls that form a cubic box. Obtain the wavecuntions and the energies. Homework Equations This is a summary of the solutions: http://quantummechanics.ucsd.edu/ph130a/130_notes/node202.html Here there is also some info...
  41. E

    How Does Removing Particles Affect Fermi Energy in a 3D Gas?

    Homework Statement Consider a 3D gas of N non-interacting fermions in a volume V at temperature T << Ef / k. Suppose that the particles in the energy range [0.25 Ef, 0.5 Ef] are suddenly removed. Calculate the Fermi energy of the remaining particles after the system reaches its new thermal...
  42. A

    How can I properly constrain a 3D truss beam in ANSYS using only beam elements?

    Hello! I'm trying to model my truss with FEM using only beam elements in ANSYS, but I am experiencing difficulties with the constraints between the members (or coupling of the DOFs). For instance, I want my truss chords to be continuous and my lattice members to be pinned to them. I couple...
  43. miraiw

    Could fluorescence quenching be used for making 3D images?

    Looking at the image from this wikipedia article, it looks like there's a selective fluorescing of the quinine dependent on the presence of chrolide ions in the solution. If the concentration of chloride ions in a solution could be controlled into a particular shape, shining a violet laser on...
  44. K

    What are the Equilibrium Conditions for a 3D Rigid Body with Applied Forces?

    Homework Statement The rod assembly shown has a ball-and-socket joint at A and a smooth journal bearing at C. The forces F1=600N , F2=410N , F3=460N , and F4=950N are applied as shown in the figure. The geometry of the rod assembly is given as a=0.900m , b=0.650m , and c=0.800m...
  45. PsychonautQQ

    Kinetic Energy of particle in 1D and 3D well

    So my professor said that the Kinetic energy of the particle in a 3D infinite well is dependent on position where in a 1D infinite well it's NOT dependent on position. She is sort of notorious for being wrong apparently and many of my undergrads are telling me she is wrong. I understand that...
  46. hideelo

    Angular momentum in the 3D Schrodinger eqn with a central force

    I guess this question can apply in all the generality of the 3D Schrodinger eqn. with a central force, the case I'm thinking of however is the the hydrogen atom. When solving the equation, we derive the quantization of the angular momentum, which has me thinking that before we begin quantizing...
  47. R

    Advice on buying a laser for 3D modeling

    I'm developing a scanner that uses a laser for edge detection. It will be mounted on a hexacopter that will traverse a short distance through a cave/tunnel system and produce a 3D image. I'm still researching on ways to process this data but I'm thinking of using a edge detection algorithm in...
  48. J

    How Do You Calculate the Density of States for Massless Particles in a 3D Cube?

    Homework Statement Calculate the single particle density of states for massless particles with dispersion E=h_bar ck for a 3D cube of volume V Homework Equations E=pc, p=E/c, dp=dE/c, d^3p = 4pi*p^2 dp k=sqrt(k_x^2+k_y^2+k_z^2) k_j = 2pi/L l_j (j=x,y,z) The Attempt at a Solution I...
  49. A

    MATLAB Entering simulink 3D look-up table data from MATLAB

    I have created a contour plot in MATLAB using the following code: >> NP=40; >> [RP TP]=meshgrid(linspace(min(RPM),max(RPM),NP),linspace(min(BMEP),max(BMEP),NP)); >> BSFC_IT=griddata(RPM,BMEP,BSFC,RP,TP); >> NC=12; >> Fig1=figure; >> [CT...
  50. L

    MHB Rate of Change of Airplanes in 3D

    One plane is flying due east straight and level at 30000 feet and at 420 mi/h. A second plane flies due north at 40560 feet and at 480 mi/h. The second plane crosses above the flight path of the first plane 2 minutes after the first plane passes that point. How fast were they approaching each...
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