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1500 questions
3
votes
1 answer
Slide a rectangle along a sphere
I'm using NASA WorldWind to place a rectangle on the Earth ('sphere'). When I drag the rectangle on the sphere, the rectangle changes shape and size but the dimensions should be preserved.
What is needed to preserve the rectangle's original…
Erik
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- 3
3
votes
0 answers
Problems in using cox regression with restricted cubic spline plot with R software
In R software, I want to plot a graph by using cox regression with the restricted cubic spline method. However, I can't quite get it to work.
This is the code I'm using:
library(rms); require(rms); library(Hmisc)
d<-curve.men
dd <-…
Xudong Liu
- 31
- 2
3
votes
0 answers
Projecting light shapes
I am wondering how professional light visualizer software (like Capture Argo - WYSIWYG - Realizzer - LightConverse) project the lights on the objects (like stage, floor, people), even projecting the various gobos (shapes).
Here are some…
Freddy Violato
- 31
- 2
3
votes
0 answers
Compute angles and thereby endpoints in a raster grid?
I am at the moment having some issues with computing an endpoint in a raster grid that is also a valid position in a graph.
I am trying to draw a line between these two points, but as the point I am computing becomes negative, its position becomes…
Bob Burt
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3
votes
0 answers
Draw lines angled from 0 to 2 pi in a raster grid
I am trying to draw an angled line in a raster grid.
The idea is to create a function that given a start point, a length and an angle, would give me the pixel positions that combined would give me a line at the specified angle, in a raster grid.
I…
noob
- 31
- 1
3
votes
0 answers
ImageJ alternative for Ruby on Rails Development
I have an analysis management web system developed using Ruby on Rails and I need to analyse an uploaded image in my system. Using Java I used to have ImageJ included im my projects. Since I'm new in Ruby on Rails I don't know any library/gem to…
Mout
- 31
- 1
3
votes
1 answer
First quad being re-used?
I had posted about this issue in a previous question, however, I thought instancing was causing it, whereas even using normal uniforms or a SSBO (which's what I'm using right now) causes it, which means the problem is elsewhere.
I've been trying to…
Darkilon
- 91
- 8
3
votes
1 answer
Is there some book about how to design a 3D math lib?
3D math covers vector algebra and matrix algebra, which are easily calculated on paper, but not so easy when coding them effectively. I only leant some basic algorithms on matrix in my Data Structure course, which is not enough when it comes to…
Lucas
- 139
- 2
3
votes
1 answer
Does this type of memory-mapping for a display exist?
Most information about memory mapped displays on the net are about those in which there is essentially a location in main memory for each pixel on the display. A hypothetical 1024 x 512 display would therefore have 524,288 locations each mapped to a…
Cyber99
- 31
- 1
3
votes
1 answer
What is the basic difference between Radar Screen, CRT and Oscilloscope displays?
What is the basic difference between Radar Screen, PC CRT Monitor, and, Oscilloscope displays?
All of them use CRT. So, what is the difference?
user464
3
votes
3 answers
Transform a point into another point
I have the following problem:
Give a matrix that will transform the point $(x,y,z)$ into the point $(\frac{2}{x+y}, \frac{5y + z}{2x + 2y}, 3)$.
I have been reading my book to find a way to solve it without success. I will very much appreciate your…
JORGE
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3
votes
2 answers
Can raytracing be used to imitate the behavior of light to a higher degree?
Raytracing "sees" the pixel on the other side of the screen;
but doesn't this mean the rays traced can be computationally reflected and refracted imitating the properties of actual light?
It'd be exciting if it were possible. Any visual scene…
Loogai
- 139
- 2
3
votes
1 answer
GLUT OpenGL - Drawing Shapes using only GL_POINTS
I'm working on an assignment and I need to draw using only GL_POINTS. I realize this is an expensive approach but it's for the homework, so no GL_TRIANGLES / GL_POLYGON / GL_LINES etc.
First, I'm trying to understand the concept of using only…
chris thomas
- 131
- 3
3
votes
1 answer
What algorithm(s) are behind Google Street View's 3d mapping mode?
I recently noticed that in some locations you could switch to a 3d mapping mode in Google Street View.
Which algorithm(s) did they use to generate the 3d models of the streets? I assume it was more than just capture, given the huge amount of data…
wip
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3
votes
2 answers
What is the difference between a "meshlet" and just a small mesh?
Obviously, conceptually, a meshlet is just a small mesh. But what is the reason for making the distinction then? I'm assuming it has to do with how they are implemented.
In a meshlet architecture, does a parent mesh contain the complete vertex…
Chris Gnam
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