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I'm using Electro in Lua for some 3D simulations, and I'm running in to something of a mathematical/algorithmic/physics snag.
I'm trying to figure out how I would find the "spin" of a sphere of a sphere that is spinning on some axis. By "spin" I mean ...
Started by Ben Torell on
, 3 posts
by 3 people.
Answer Snippets (Read the full thread at stackoverflow):
A is a rotation matrix! After all, ....
Your unit vectors X,Y,Z can be put together to form a 3x3 matrix:
A = [[x1 y1 z1], [x2 y2 z2], [x3 y3 z3]]
Since X,Y,Z change with time, A also changes with time .
This is my edited answer.
My first answer was wrong.
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I've got a collection of 10000 - 1 spheres, and I need to find the ones farthest apart.
One simple way to do this is to simply compare all the spheres to each other and store the biggest distance, but this feels like a real resource hog of an algorithm...
Started by illuzive on
, 6 posts
by 6 people.
Answer Snippets (Read the full thread at stackoverflow):
I think what you're to compare sphere....
Since the distance from Sphere A to Sphere B is the same as the distance from Sphere B to Sphere A, you can minimize the number of comparisons you have to make.
Be solved using graphs.
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I want to draw a 3d ball or sphere in html 5.0 canvas. I want to understand the Algorithm about how to draw 3d sphere. Who can share this with me?
Thanks in advance ！
Answer Snippets (Read the full thread at stackoverflow):
To see some examples of doing 3D in canvas you can look at: http://www.canvasdemos.com/2009/02/26/3d-on-2d-canvas/
You will ... .
Well, an image of a sphere will always have a circular shape on your screen, so the only thing a single sphere.
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Ask your Facebook Friends
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I am trying to determine whether a line segment (i.e. between two points) intersects a sphere. I am not interested in the position of the intersection, just whether or not the segment intersects the sphere surface. Does anyone have any suggestions as ...
Started by Morgoth on
, 5 posts
by 5 people.
Answer Snippets (Read the full thread at stackoverflow):
Or you/index.php/Ray_Sphere_Intersection
I don't know what the standard way of doing it is, but if you only point is inside the radius of the ....
Algorithmically is to switch from ray-sphere intersection to ray-bounding-box intersection.
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Basically i want a 3d rotating earth. gluSphere function isn't found. is it available on the iphone's opengl es? how can i render a sphere otherwise?
Started by tom on
, 3 posts
by 3 people.
Answer Snippets (Read the full thread at stackoverflow):
No GLUT for the iPhone, but this may be what you are looking for
Procedural sphere.
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Hello everyone,
I have a closed object described by a surface representation of triangles (described by three vertices which forms a right hand rule with a normal pointing to the "outside" of the object). I place a sphere of some radius in 3D space somewhere...
Started by Faken on
, 8 posts
by 7 people.
Answer Snippets (Read the full thread at stackoverflow):
The intersection....
To a plane to see if the sphere touches any of the planes defined by any set of three vertices which of the sphere and the object, then you can just test if the center of the sphere (as a reference point if you need to be.
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I want to create an animating sphere representing the earth but here is the catch i want the users to be able to spin it round in real time, any suggestions what tools will do the trick?
Answer Snippets (Read the full thread at stackoverflow):
If it helps, there's an example of a flash-based.
It has the built-in functionality to create a sphere.
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I am going to be making an application that lets users input several parameters for a bowling ball layout, and then show what that layout would look like on the ball. I have found some good resources for sphere math, so if I have a sphere whose center...
Started by Chris Marasti-Georg on
, 4 posts
by 4 people.
Answer Snippets (Read the full thread at stackoverflow):
If you use GLUT, you could just have the library draw the sphere for you without you having.
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I need the fastest sphere mapping algorithm. Something like Bresenham's line drawing one.
Something like the implementation that I saw in Star Control 2 (rotating planets).
Are there any already invented and/or implemented techniques for this?
I really...
Started by avp on
, 3 posts
by 3 people.
Answer Snippets (Read the full thread at stackoverflow):
Be divided into equal parts (very little distortion) Very simple, recursive geometry of the sphere a sphere " ? I do not have access to the full articles, but it looks like what you need..
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Does anyone know how to achieve a 3D sphere tag cloud, like on this site:
http://krypted.com/
Is there a Javascript library that can easily do this, or was it most likely written by hand?
Started by Andy White on
, 4 posts
by 4 people.
Answer Snippets (Read the full thread at stackoverflow):
It's a wordpress plugin: 3D tag cloud If you are putting it in a wordpress blog, you could... .
While there are ways to accomplish it in javascript I haven't seen any ready-made products that do just that .
That is done in Flash using the WP-Cumulus plugin.
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