3d Definition and 1000 Threads

Hi i want to know how to make a 3D metal box whose length, width, and height i can change. For example, i have a box of 3 m x 3 m x 3 m. i should be able to extend any dimension by a maximum of 1 meter i.e 4 meter (say). I want to use this to store items whose size is unknown, but the limits of...

Hi all, I'm currently working on a 3D game and am in the city development phase (its done procedurally). The issue is is that once I get to 22 000 buildings (80 000-100 000 models roughly) it causes a drop to 5fps(frames per second) (even with collision detection off). I'm using instancing to...

Hello! I need to build an electromagnet for my DIY project. But I have a problem with choosing right configuration. But I have not found any open-source or student-license software for this goal... It would be great if someone could post some links to that kind of software.

Hi everyone, as the title says, I am looking for a 3D cad to help visualise designs in piping systems and cut down errors. As a short background, I work in a small company which occasionally designs industrial gas pipings for pneumatic systems, gas delivery systems (to a lab, workshop, etc)...

Hey guys :)Can anyone point me in the right direction on where to start with 3D printing engineering? I'm kinda lost but I'm super pumped and very very motivated to learn this stuff!

Hi experts! Do you know how to export an ANSYS model into STL format? I´ve only found some method for solid meshes here http://www.padtinc.com/blog/the-focus/color-3d-printing-ansys-ansys-mechanical-and-mechanical-apdl-results, but my model contains only BEAM4 elements. Would it be possible...

Homework Statement I am trying to find the direction of an E-Field from a given E-Field vector in 3d space. If I have an electric field vector of (-1i, -2j, 3k), the magnitude of the field is sqrt(-1^2 + -2^2 + 3^2) = 3.74, but how do I find the direction? Homework Equations tan(y/x)? The...

So for the longest time now i have always avoided trying to picture things in 3D or anything related to 3D whether it is maths, physics, chem etc. But recently i have been really attracted to physics and math and well i decided to just start studying both these subject whenever i have free...

Hello! There is a parametric way of defining a spiral curve: z = a*t; x = r1*cos(w*t) y = r2*sin(w*t). Is there a way to define the thickness of spiral?

Suppose, I know the metric tensor of a 2D space. for example, the metric tensor of a sphere of radius R, gij = ##\begin{pmatrix} R^2 & 0 \\ 0 & R^2\cdot sin^2\theta \end{pmatrix}## ,and I just know the metric tensor, but don't know that it is of a sphere. Now I want to draw a 2D space(surface)...

Let’s imagine a moving point bound to a 2D plane. If we wrap this plane on a sphere within a 3D space the point would now eventually end up at the same position while moving in a seemingly fixed direction (it is actually not fixed in the 3D space). I am now wondering: Can a 3D hyperplane be...

Homework Statement This is a pretty simple system but I'm supposed to use the methods described in Landau (equations below), which are integrables derived from energy conservation and angular momentum conservation. Homework Equations T=2∫_{r_{min}}^{r_{max}} \frac...

Can someone please look at the diagram below and tell me how u1 is obtained. If it is through the use of m3 please explain how the gradient m3 is obtained.

I plotted the real and imaginary parts of a complex function \(z^{1/3}\). The two plots are similar to the Riemann surface is that correct?

EDIT: There was an issue where half of the post was missing, so I apologise but i have redone it I was not sure if this was the most appropriate forum for this or not, so feel free to move if needed. 1. Homework Statement A football (soccer ball) with a diametre of 0.44m is tracked using a...

Homework Statement A man is standing in his home , his position his facing direction and the position of the sweet dish are given ,if he faces the sweet dish , he eats it . Translating it into CS programming question : write a function -> bool IsManInFrontofDish( vector3& manPosition, vector3&...

How the brain creates 3 dimensional image (what you see) from information that photons carry to your eyes? Photons travel with constant speed so your brain can't calculate how far object is from their velocities. I know stereoscopic vision helps to calculate distance from objects but even when...

Homework Statement This is not homework but relevant to an interaction model that I am developing. I assume an even distribution of sources on a spherical 3d-hypersurface, the sources having a potential as a function of pairwise 4-distance between any two sources. I wish to obtain the sum...

Dear Friends! How can I find the minimum value of sum of cosine of angles between three unit vectors in three dimension space

So I have two parametrized equations for two different 3d curves: Rm(t) = (1.2*sin(2πt) + 0:3)i + t4j + 1.1cos2(2π(t + 0:2))k and R(t) = Sin(2πt)i + t3j + Cos2(2πt)k I need to figure out if these two curves come within a certain distance of each other (0.5). I cannot understand how to find...

Homework Statement What are the possible degeneracies and what is the symmetry of the position probability distribution in the case of a particle subject to a three-dimensional potential with cubic symmetry?Homework Equations n/aThe Attempt at a Solution With a three-dimensional potential...

I have a 3D Plot in Mathematica and I would like to get coordinates for points (all points) that were plotted.

I've been stuck trying to figure out what's going on in a particular section of my notes for the last couple days. The biggest issue is the lecturer has just not explained where the example has come from and what it represents. I thought I would post the relevant section here and see if anyone...

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...

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...

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...

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...

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?

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...

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...

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...

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...

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...

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...

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...

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...

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 +...

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...

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...

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

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...

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...

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...

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...

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?

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...

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...

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...

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...

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...