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Questions tagged [geometry-surface]

The mathematical or computing concept of a 2-dimensional shape.

Surface is a place of a manifold of two-dimensional points (flat surface) or surface is a continuous boundary which divide a three-dimensional space into two sections (curved surface). In general, a hypersurface is a variety of (n-1)-dimension points in n-dimensional space.

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Calculating surface area from 3d data points

I am new to python. I have 3d data points , say x ranges from (118 to 123), y ranges from (0 to 10), z ranges from (-4 to 4). So using these data points , how to calculate the surface area (Axyz) using python. Any help is thankful.
Ram
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Matlab surface plot not giving desired results

I am charting the following data: a=[... 0.1, 0.7, 0.00284643369242828;... 0.1, 0.71, 0.00284643369242828;...] such that column 1 never surpasses approximately 10 also such that column 2 goes from .7 to 1. Column 3 seems ok When i…
jason m
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Matlab-like isosurface library for c++

Is there any C++ library which has function like isosurface for MatLab? Here is the example of what I need: clc clear n = 30; x = linspace(-125,125,n); y = linspace(-125,125,n); z = linspace(-260,25,n); [X,Y,Z] =…
user1364012
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Writing Text on a Sphere in FireMonkey

Is there a way to write text on the surface of a sphere component in FireMonkey, short of creating a bitmap with the text, and importing the text to a TextureMaterialSource?
Tom Marchione
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"Normalize" procedure in C#

Could someone explain to me what the normalization procedure for 3D surface mesh in C# is? In a reference book, there is a line as follows : The GetNormalize method is used to map the region of your surface into a region of [-1, 1], which gives…
user189324
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Matlab: Using surf within a uipanel

I have a 2d matrix containing 4 possible different values. I've used surf to display it as a like a chess board which works fine. Now i'm building a UI for my project (w/o GUIDE) and I'm trying to set a parent for the surf in one of the uipanel I…
Guy Wald
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CUDA: Get subset of 3D Surface

I want to render some slices of a 3d surface. cudaArray* surfArray; cudaChannelFormatDesc channelDesc = cudaCreateChannelDesc(8, 8, 8, 8, cudaChannelFormatKindUnsigned); cudaExtent surfSize =…
avo
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Why do Matlab surfaces disappear when the camera is too close?

I'm creating a surface using elevation data and texturing it with orthoimagery to render terrain in Matlab. I'd like to be able to render the view from the perspective of a small UAV flying around. However, when I move the camera too close to the…
Brandon
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How can 2D text be reflected onto 3D mesh surface?

How can a 2D text be reflected onto 3D mesh surface in C# ? Thanks in advance. Cemo
Cemo
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Find the center-coordinates of a rotated rectangle

I am having trouble with finding the X and Y-coordinates of the center of a rotated rectangle through mathematical calculations. What I have is the width 'A' and height 'B' of a rectangle, as well as its rotation 'R' in degrees. What would be the…
LaurenzMorbe
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Geometrical Modeling of a Rope

Assume a Rope of a given length and a given stiffness (that means a minimum bending radius). Both ends are fixed at a given point in a given direction (angle) on a plane e.g. with some clamps. The rope is loose and lays in one ore more loops. It has…
Steffen
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What is wrong with my code to calculate the overlapping area of two rectangles in c++?

My goal is to calculate the area of the complete figure in the coordinate plane, excluding the intersecting area. Can someone help me see what I need to fix? #include #include using namespace std; int minusOverlap(int lx, int…
vAnshuv
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Intersection of an infinite cylinder and circle in 3D space

I'm trying to determine if an infinite cylinder and circle intersect in 3D space. This has been asked here: Finding the intersection of the Circle and Infinite Cylinder in 3D space However, only a mathematician can understand the response by Yves…
msedore
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Calculate the eccentricity of ellipses

I've like to calculate the eccentricity of ellipses x, in my example: #Artificial ellipse a <- 1 # semi-major axis e <- x# eccentricity b <- a * sqrt(1 - e^2) # semi-minor axis c <- 1.3 # ellipse area But I need to make this using the ellipse…
Isabel
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find polygons/lines/points in array of latitude/longitude points using php/javascript

I have an online app I am developing to search for historical wheat collection sites matched to climate http://www.wheat-gateway.org.uk/climate_search_1.php?ord=4&cns=108,114&ctrl_r=1//522/891&ctrl=1 I have the collection sites (some 173,000 and the…
Andrew Forbes
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