Mapping Definition and 404 Threads

Texture mapping is a method for defining high frequency detail, surface texture, or color information on a computer-generated graphic or 3D model. The original technique was pioneered by Edwin Catmull in 1974.Texture mapping originally referred to diffuse mapping, a method that simply mapped pixels from a texture to a 3D surface ("wrapping" the image around the object). In recent decades, the advent of multi-pass rendering, multitexturing, mipmaps, and more complex mappings such as height mapping, bump mapping, normal mapping, displacement mapping, reflection mapping, specular mapping, occlusion mapping, and many other variations on the technique (controlled by a materials system) have made it possible to simulate near-photorealism in real time by vastly reducing the number of polygons and lighting calculations needed to construct a realistic and functional 3D scene.

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  1. S

    I What Is the Customary Definition of Zero Mapping in Set S Mappings?

    In the context of the mappings of a set S into itself, when S is not number system with a zero, what is the customary definition for "zero mapping"? ( ChatGPT says that its a mapping that maps each element of S to some single element of S , i.e. maps all elements to some constant. )
  2. GeniVasc

    I What maps are considered in the Polyakov path integral?

    Recently I've came to some references on mathematical aspects on string theory that deal with the Polyakov euclidean path integral. An example is the book "Quantum Fields and Strings: A Course for Mathematicians. Volume 2", where it is stated roughly that the path integral is $$A =...
  3. B

    B Mapping wave forms to sphere, does wave form y=0 have a reflection?

    Zero does not have an inverse. And y=0 does not have an inverse. Does the wave form y=0 for all x have an inverse?
  4. srgmath2905

    A How Does Induced Mapping Function in Algebraic Topology?

    Given example for what is induced mapping ? In basic level
  5. Astronuc

    Mapping "Every Inch [or cm] of the Seafloor"

    I came across an article in Scientific American while browsing the news app on my smartphone. The article was originally published with the title "Every Inch of the Seafloor" in Scientific American 327, 2, 40-47 (August 2022) doi:10.1038/scientificamerican0822-40 Summary...
  6. Alpha Roy

    A Mapping High Symmetry Points from Primitive to Conventional Cell

    We usually plot electronic bands with the help of high symmetry points of the irreducible zone of primitive cell of particular material. But if we want to plot bands with conventional cell, we have to map the high symmetry points from primitive cell to conventional cell. so how can we map the...
  7. redtree

    B One-to-many relations in group theory

    I apologize for the simple question, but it has been bothering me. One can write a relationship between groups, such as for example between Spin##(n)## and SO##(n)## as follows: \begin{equation} 1 \rightarrow \{-1,+1 \} \rightarrow \text{Spin}(n) \rightarrow \text{SO}(n) \rightarrow 1...
  8. H

    Matrix with a bounded mapping as an entry is bounded

    In a previous exercise I have shown that for a $$C^{*} algebra \ \mathcal{A}$$ which may or may not have a unit the map $$L_{x} : \mathcal{A} \rightarrow \mathcal{A}, \ L_{x}(y)=xy$$ is bounded. I.e. $$||L_{x}||_{\infty} \leq ||x||_{1}$$, $$x=(a, \lambda) \in \mathcal{\hat{A}} = \mathcal{A}...
  9. cianfa72

    I Global coordinate chart on a 2-sphere

    Hi, I know there is actually no way to set up a global coordinate chart on a 2-sphere (i.e. we cannot find a family of 2-parameter curves on a 2-sphere such that two nearby points on it have nearby coordinate values on ##\mathbb R^2## and the mapping is one-to-one). So, from a formal...
  10. S

    I General Method for Mapping an Ellipsoid to Unit Sphere

    I have been working on a problem for a while and my progress has slowed enough I figured I'd try reaching out for some more experience. I am trying to map a point on an ellipsoid to its corresponding point on a sphere of arbitrary size centered at the origin. I would like to be able to shift any...
  11. Arman777

    Why are all values NaN after mapping 'player_name' column in Pandas Data Frame?

    I have two data frames df1 and df2 df1 has two columns 'player_name' and 'player_id'. Similarly df2 has 'player_id' column. From this configuration I want to pass 'player_name' column to df2 by using 'player_id'. For this reason I have tried something like this, df2['player_name'] =...
  12. Y

    Anyone know SFML to answer this screen mapping question?

    Hi I am just starting to studying games with C++ by Horton for a few days. It uses SFML for graphics, sound and fonts. I am puzzled with the screen map location. In the program below, you can see the resolution is 1920 X 1080 full screen. But there are something funny when I create a sprite and...
  13. Arne

    I Z2 symmetry in the hydrogen molecule when mapping to qubits

    Hello! When using a Jordan-Wigner-mapping or parity-mapping to map the hydrogen molecule \mathrm{H}_2 with two electrons and 4 spin-orbitals to 4 qubits, it is possible to reduce the number of qubits down to two [1,2,3]. The reason is apparently that the molecule has a discrete...
  14. E

    B Mapping between rules of classical vs QM probability?

    Apologies in advance for my ignorance, I don't really have a reference to consult and Google hasn't been too helpful! In standard probability theory there are a few common useful formulae, e.g. for two events ##S## and ##T## $$P(S\cup T) = P(S) + P(T) - P(S\cap T)$$ $$P(S \cap T) = P(S) \times...
  15. benorin

    I I need a mapping from the unit Hypercube [0,1]^n to a given simplex

    I need a mapping from the unit Hypercube ##C^n:= \left[ 0,1\right] ^n## to a given simplex, namely ##S^n:=\left\{ \vec{x} \in\mathbb{R}^n |0\leq x_1\leq 1, 0\leq x_{k}\leq x_{k-1}\text{ for } k=2,3,\ldots , n\right\}##. Anybody know one? I have other requirements I need satisfy, so if you know...
  16. G

    B Understanding Dual Space: Mapping Vector Space to Real Numbers

    I understand that the Dual Space is composed of elements that linearly map the elements of the Vector Space onto Real numbers If my preamble shows that I have understood correctly the basic premise, I have one or two questions that I am trying to work through. So: 1: Is there a one to one...
  17. JD_PM

    Matrix representation of a linear mapping

    I know that to go from a vector with coordinates relative to a basis ##\alpha## to a vector with coordinates relative to a basis ##\beta## we can use the matrix representation of the identity transformation: ##\Big( Id \Big)_{\alpha}^{\beta}##. This can be represented by a diagram: Thus note...
  18. S

    B What Does the Scalar R Represent in Tensor Mapping on a Smooth Manifold?

    When I'm going from a smooth manifold to R with V* X V -> R what does the R scalar stand for. Is it some length in the manifold? and Does this have to do with the way V* and V are defined, since one is a contra-variant and one is a co-variant, are they related in the way the Pythagoras formula...
  19. F

    A Solvability Of The Couniversal Mapping Problem On Products

    Let us assume a functor ##\mathscr{F}\, : \,\mathcal{G} \times \mathcal{K}\longrightarrow \mathcal{Set}## which is contravariant on ##\mathcal{G}## and covariant on ##\mathcal{K}##. The question whether for any object ##G \in \mathcal{G}## the covariant functor...
  20. S

    Prove that this mapping is a bijection

    How would one tackle this using the definition? (i.e. for some function ff that f(x)=f(y)⟹x=yf(x)=f(y)⟹x=y implies an injection and y=f(x)y=f(x) for all yy in the codomain of ff for a surjection, provided such x∈Dx∈D exist.) One can solve the system of equations for x1x1 and x2x2 and that...
  21. DaniV

    A Mapping the Phase Space of Type II Superconductors

    Due to my lab work I want to try map the phase space that created with critical external magnetic field H_c and the critical current J_c through the superconductor of type II. the critical transition happen from the Abrokosov phase to the non-superconductor phase, occurred by the fact that in...
  22. M

    MHB Mapping linear spaces to nonlinear ones.

    Hi I would like to find out please what it would mean to transform a vector based on some property that it has and if you do that to more than one vector would both operations be isomorphic in some respect. Is there a set of vector transformations of this time that could be used to process non...
  23. A

    B Is there a standard mapping of celestial coordinates to geo-coordinates

    Sorry, I'm not an astronomer. This question relates to the book "S." by Doug Dorst. I understand that the celestial coordinates have a zero-point at the vernal equinox. (0h, 0m, 0s RA, 0⁰, 0", 0' Dec.) I also understand that it's possible to map these coordinates to spherical, or...
  24. stephchia

    Finding the linear mapping between homogeneous coordinates

    Homework Statement If I have an affine camera with a projection relationship governed by: \begin{equation} \begin{bmatrix} x & y \end{bmatrix}^T = A \begin{bmatrix} X & Y & Z \end{bmatrix}^T + b \end{equation} where A is a 2x3 matrix and b is a 2x1 vector. How can I form a matrix...
  25. evinda

    MHB Find Linear Mapping: Help Solving $V \setminus (W_1 \cup \cdots \cup W_m)$

    Hello! (Wave) Let $F$ be a field with infinite elements and $V$ a $F$-linear space of dimension $n$ and $W_1, \dots, W_m$ subspaces of $V$ of dimension $n_i<n, i=1, \dots, m$. We want to show that $V \setminus{(W_1 \cup \cdots \cup W_m)} \neq \varnothing$. Fix a basis $\{ v_1, \dots, v_n\}$...
  26. Greg

    MHB What is the Image of Point P and Line Segment TJ in Triangle Mapping Problem?

    If triangle JPT ----> triangle J`P`T`, what is the image of P? The image of TJ ? Any help would be awesome. (Posted on behalf of Robbie Marsh.)
  27. T

    I Regarding cardinality and mapping between sets.

    why is not always true that if ##\vert A\vert\leq\vert B\vert## then there exist an injection from ##A## to ##B##?
  28. Aleoa

    Mapping beetween affine coordinate functions

    Homework Statement Homework Equations As the book says , an affine function of a line is A\rightarrow \mathbb{R} and represent the real number that, multiplied for a basis and starting from an origin of the line gives a certain point of the line, so a origin of the line and a basis is...
  29. S

    I Linear mapping of a binary vector based on its decimal value

    Given an ##N## dimensional binary vector ##\mathbf{v}## whose conversion to decimal is equal to ##j##, is there a way to linearly map the vector ##\mathbf{v}## to an ##{2^N}## dimensional binary vector ##\mathbf{e}## whose ##(j+1)##-th element is equal to ##1## (assuming the index starts...
  30. M

    I Conformal Mapping Wedge to Plate

    Hi PF! Does anyone know the conformal map that takes a wedge of some interior angle ##\alpha## into a half plane? I'm not talking about the potential flow, just the mapping for the shape. Thanks!
  31. olgerm

    I Map possible values of a set with a condition to the naturals

    I want a way to map natural numbers to possible values of set A. It would also be helpful if you could tell me how many possible values are for set A(it depends of k). All that is known about set A is: Non of set A elements is subset to another element of A, but all elements of set A are proper...
  32. M

    MHB Fixed point iteration: g is a contraction mapping

    Hey! :o We have the function $f(x)=x^5-\frac{5}{16}$. I have approximated the root of that function using three steps of Newton's method with initla value $x_0=\frac{1}{2}$ : \begin{align*}x_1&=x_0-\frac{f(x_0)}{f'(x_0)}\approx \frac{7}{5} \\ x_2&=x_1-\frac{f(x_1)}{f'(x_1)} \approx...
  33. R

    Is the linear mapping T(x) one to one?

    Homework Statement This is for a linear algebra class, but it's taught my mathematicians, for mathematicians and not physicists or engineers so we write pseudo-proofs to explain things. In Exercises 37–40, let T be the linear transformation whose standard matrix is given. In Exercises 37 and...
  34. hoalacanhdk

    Application of Conformal Mapping in Physics

    Hi, I'm studying about Conformal Mapping in Complex Analysis and see its applications in Heat transfer, Fluid and Static Eletrocity. But it is said that this subject is very useful in many branches of Physics. Can you tell me about that? Thanks.
  35. S

    A Operator mapping in Hilbert space

    Hi, I have an operator given by the expression: L = (d/dx +ia) where a is some constant. Applying this on x, gives a result in the subspace C and R. Can I safely conclude that the operator L can be given as: \begin{equation} L: \mathcal{H} \rightarrow \mathcal{H} \end{equation} where H is...
  36. A

    MHB Mapping of a Circle in the Complex Plane

    I have a circle with centre (-4,0) and radius 1. I need to draw the image of this object under the following mappings: a) w=e^(ipi)z b) w = 2z c) w = 2e^(ipi)z d) w = z + 2 + 2i I have managed to complete the question for a square and a rectangle as the points are easy to map as they are...
  37. PsychonautQQ

    I Noncompact locally compact Hausdorff continuous mapping

    Self studying here :D... Let X and Y be noncompact, locally compact hausdorff spaces and let f: X--->Y be a map between them; show that this map extends to a continuous map f* : X* ---> Y* iff f is proper, where X* and Y* are the one point compactifications of X and Y. (A continuous map is...
  38. Astronuc

    Mapping the ocean floor - bathymetry survey

    The search for the missing aircraft of flight MH370 has yielded information on the region of the Indian Ocean under survey. http://www.upworthy.com/amp/they-looked-for-missing-flight-mh370-for-3-years-heres-what-they-found-instead...
  39. davidge

    I Why Does the Area Element Vanish at the Origin in Polar Coordinates?

    Consider the mapping ##f: \mathbb{D}^1 \longrightarrow [0,1] \times (0,2 \pi]## where ##\mathbb{D}^1## is the unit disk. This is the familiar polar coordinate system. The area element is ##dx \wedge dy## in ##\mathbb{D}^1## and ##r dr \wedge d\theta## in ##[0,1] \times (0,2 \pi]##*. Now at ##r...
  40. Adgorn

    Proving a mapping from Hom(V,V) to Hom(V*,V*) is isomorphic

    Homework Statement Let V be of finite dimension. Show that the mapping T→Tt is an isomorphism from Hom(V,V) onto Hom(V*,V*). (Here T is any linear operator on V). Homework Equations N/A The Attempt at a Solution Let us denote the mapping T→Tt with F(T). V if of finite dimension, say dim...
  41. Adgorn

    Proof regarding transpose mapping

    Homework Statement Suppose T:V→U is linear and u ∈ U. Prove that u ∈ I am T or that there exists ##\phi## ∈ V* such that TT(##\phi##) = 0 and ##\phi##(u)=1. Homework Equations N/A The Attempt at a Solution Let ##\phi## ∈ Ker Tt, then Tt(##\phi##)(v)=##\phi##(T(v))=0 ∀T(v) ∈ I am T. So...
  42. A

    I Mapping double cover over a torus

    I am interested in plotting contours (and integrals) over the algebraic function ##w^2-(1-z^2)(1-k^2 z^2)=0## on it's normal Riemann surface, a torus. Anyone here interested in helping me with this? I have the basic idea just the details I'm having problems with. Would be a nice educational...
  43. S

    I Meaning of mapping R[X]->Maps[R,R]

    This is going to be a really silly question, but here it goes. In a ring theory lecture, I was given a definition to a polynomial ##P \in R[X]## evaluated at the element ##\lambda\in R##. I understand the evaluation bit as it is trivial to substitute a lambda into X. At the end of the...
  44. vantroff

    B Mapping plane/set into/onto itself (What exactly does this mean?)

    I've seen in books things like "G is mapping of plane into itself", "map of a set into itself" or "map of set/plane onto itself". What exactly to map into/onto itself means? Do this means that when G maps into itself we get G as a result or we can also associate points on G to other points as...
  45. M

    Proving local injectivity of curve

    Homework Statement Let γ : I → Rn be a regular smooth curve. Show that the map γ is locally injective, that is for all t0 ∈ I there is some ε > 0 so that γ is injective when restricted to (t0 − ε , t0 + ε ) ∩ I. Homework Equations The Attempt at a Solution [/B] So I know a function (or a...
  46. M

    MHB Is the transformation matrix of $\Phi$ in relation to $B$ correct?

    Hey! :o Let $B=\{b_1, \ldots , b_5\}$ be a basis of the real vector space $V$ and let $\Phi$ be an endomorphis of $V$ with \begin{align*}\Phi (b_1)& =4b_1+2b_2 -2b_4-3b_5 \\ \Phi (b_2)& = -2b_3 +b_5 \\ \Phi (b_3)& = -4b_2+2b_3 -b_5 \\ \Phi (b_4)& =-2b_1 +3b_3+b_4-b_5 \\ \Phi (b_5)& = 3b_2...
  47. C

    Graphing a function under a complex mapping

    Homework Statement Illustrate the mapping of f(z)=z+\frac{1}{z} for a parametric line. The Attempt at a Solution the equation for a parametric line is z(t)=z_0(1-t)+z_1(t) so I plug z(t) in for z in f(z), but I don't get an obvious expression on how to graph it, I tried manipulating it...
  48. M

    MHB Injective linear mapping - image

    Hey! :o Let $F$ be a field and $V,W$ finite-dimensional vector spaces over $F$. Let $f:V\rightarrow W$ a $F$-linear mapping. We have to show that $f$ is injective if and only if for each linearly independent subset $S$ of $V$ the Image $f(S)$ is linearly independent in $W$. I have done the...
  49. M

    MHB Solving Linear Mapping Problems with Matrix $M$ in $\mathbb K^2$

    Hey! :o Let $\mathbb{K}$ be a field. Find a matrix $M\in \mathbb{K}^{2\times 2}$ such that for the linear mapping $f:\mathbb{K}^2\rightarrow \mathbb{K}^2, x\mapsto Mx$ it holds that $f\neq 0$ and $f^2:=f\circ f=0$. Let $V$ be a $\mathbb{K}$-vector space and $\psi:V\rightarrow V$ be a...
  50. W

    A "Many-to-One" Mapping of Variables in Logistic Regression

    Hi all, I have logistically- regressed 3 different numerical variables ,v1,v2,v3 separately against the same variable w . All variables have the same type of S-curve (meaning, in this case, that probabilities increase as vi ; i=1,2,3 increases ). Is there a way of somehow joining the three...
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