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Type: Posts; User: The Little Body

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1. ## Thread: Laplacian, eigen-values and eigen-vectors

by The Little Body
Replies
3
Views
694

### The thing about what I think is something like to...

The thing about what I think is something like to transform the original Laplacian matrix to a matrix where the diagonal are degrees values (or 1 / degree values) and where only a **directed** graph...
2. ## Thread: Laplacian, eigen-values and eigen-vectors

by The Little Body
Replies
3
Views
694

### For to begin, I have decided to only use a 2x2...

For to begin, I have decided to only use a 2x2 matrix for the computation of eigen-values and eigen-vectors with this very simple 2x2 matrix

4 3
-2 -3

#include <stdio.h>
3. ## Thread: Laplacian, eigen-values and eigen-vectors

by The Little Body
Replies
3
Views
694

### Laplacian, eigen-values and eigen-vectors

Hi,

I want to graphically display eigen-vectors and eigen-values of a matrix

I have begined with this relatively basic 3x3 matrix given at https://www.youtube.com/watch?v=C5uDVyKruFg&t=82

...

by The Little Body
Replies
18
Views
5,987

### This can perhaps to be handled by a...

This can perhaps to be handled by a transformation of RGBA components via a vec4 to ivec4 reduction/conversion followed by another transformation from this ivec4 to a final vec4 conversion/expansion,...
5. ## Thread: Some question on animation

by The Little Body
Replies
6
Views
1,564

### Yes, it is. OpenGL/GLUT only handle a static...

Yes, it is.

OpenGL/GLUT only handle a static image for each frame with of course multiples "planes" like the color-buffer, the depth-buffer or the alpha-buffer.

For to handle dynamics scenes...
6. ## Thread: Some question on animation

by The Little Body
Replies
6
Views
1,564

### You have to use glutTimerFunc() with a...

You have to use glutTimerFunc() with a glutPostRedisplay() call inside the timer function for to handle the animation.

Here a simple example where you can animate the white circle using arrows...
7. ## Thread: more than 8 bits display

by The Little Body
Replies
5
Views
927

### What is the exact format of your initial data,...

What is the exact format of your initial data, it's a packed format (alls components of the colour of a pixel are stored in the same continuous block of data ) or a planar format (each color...
8. ## Thread: OpenGL dev on the Raspberry Pi3 platform and the Rasbian 8.0 distrib

by The Little Body
Replies
2
Views
3,812

### This seem to can be resolved with a transformator...

This seem to can be resolved with a transformator that can handle a power of more than 2A

I have only replace the 2.0A transformator with 2.4A transformator and the screen go to black "not as...

by The Little Body
Replies
2
Views
1,747

### Take a look at...

Take a look at http://goanna.cs.rmit.edu.au/~gl/teaching/Interactive3D/2016/tute-4.html at the "Hierarchical Modelling: Robot Arm" section

The code given can to be compiled with a simple "gcc...
10. ## Thread: more than 8 bits display

by The Little Body
Replies
5
Views
927

### So only replace the "gl_FragColor = vec4(rgb,...

So only replace the "gl_FragColor = vec4(rgb, 1);" line by something like "gl_FragColor = vec4(rgb, 1) * 256;" for example ?
(or scale values by the 8bits to 16 bits factor into the 3x3 matrix...
11. ## Thread: OpenGL dev on the Raspberry Pi3 platform and the Rasbian 8.0 distrib

by The Little Body
Replies
2
Views
3,812

### I have used the raspi-config utility for to...

I have used the raspi-config utility for to activate the experimental OpenGL driver and performances are really very better :)

pi@piYann:~ \$ glxgears
Running synchronized to the vertical refresh....
12. ## Thread: OpenGL dev on the Raspberry Pi3 platform and the Rasbian 8.0 distrib

by The Little Body
Replies
2
Views
3,812

### OpenGL dev on the Raspberry Pi3 platform and the Rasbian 8.0 distrib

Hi,

I just begin OpenGL dev on a Raspberry Pi platform

I have first installed GL and GLUT libs and devel packages and have run glxgears on my raspberry Pi3 platform with the Rasbian 8.0...
13. ## Thread: Rotate point sprite given a texture atlas

by The Little Body
Replies
5
Views
4,054

### Hi, Apollonio You think about something like...

Hi, Apollonio

You think about something like the computation of the octant when you write " compute in which part of the unit circle the camera vector falls." ?
(the "how to check in which sector...

by The Little Body
Replies
7
Views
3,751

### You say that you use **differents viewports** for...

You say that you use **differents viewports** for each display, use you two distincts windows or only one window that is splitted in two ?

If you use two windows, I think that it"s better to...

by The Little Body
Replies
7
Views
3,751

You can display your weather radar data into a texture on a thread A and use this texture on a thread B that display it

16. ## Thread: How to get contour lines on 3D volume

by The Little Body
Replies
6
Views
3,905

### Effectively, contours are generally concaves and...

Effectively, contours are generally concaves and not convex :(

This is more the second idea about to create a distinct slice for each distinct materials/depths/altidudes possibles values that...
17. ## Thread: Selecting specific GPU for OpenGL rendering when different GPUs exist...

by The Little Body
Replies
3
Views
7,485

### I think that he want to can independantly select...

I think that he want to can independantly select the GPU that handle the CUDA work on one side and independantly select the GPU that handle the display on the other side, with two NVIDIA cards
(or...
18. ## Thread: How to get contour lines on 3D volume

by The Little Body
Replies
6
Views
3,905

### This can perhaps to be make using Z values...

This can perhaps to be make using Z values generated on the zbuffer ?

You have only to read the zbuffer line by line for to have the x, y and z values for each slice
(this need of course to...

by The Little Body
Replies
2
Views
1,538

### This is why I ask this question :D This can...

This is why I ask this question :D

This can certainly to be handled via the standard GLU library http://www.glprogramming.com/red/chapter12.html, no ?
20. ## Thread: Creating a square where I am able to drag one corner

by The Little Body
Replies
8
Views
3,432

### This version select automatically the nearest...

This version select automatically the nearest corner and handle the resizing of the window

#include <stdio.h>
#include <GL/glut.h>

typedef struct
{
GLfloat x;
21. ## Thread: Creating a square where I am able to drag one corner

by The Little Body
Replies
8
Views
3,432

### Here is a simple version that move only the first...

Here is a simple version that move only the first corner with the initial position (-0.5f, -0.5f)

#include <stdio.h>
#include <GL/glut.h>

GLuint width = 500;
GLuint height = 500;

by The Little Body
Replies
2
Views
1,538

Hi,

I search one .OBJ (Wavefront 3D models) loader/viewer but than can handle free-form curve/surface body statements like this :

cstype rat bspline
deg 2 2
surf -1.0 2.5 -2.0...

by The Little Body
Replies
2
Views
1,415

### This is exactely the same thing, only inverse the...

This is exactely the same thing, only inverse the grow vs narrow action :(

by The Little Body
Replies
2
Views
1,415

### The problem seem only to be generated by the sign...

The problem seem only to be generated by the sign you use into the GLUT_MIDDLE_BUTTON in your mouse_motion() func
=> only use += instead -= and this seem to work fine

void mouse_motion(int...
25. ## Thread: combining texture compression with palettes

by The Little Body
Replies
1
Views
1,281

### The DXT1 format use 64 bits for 4x4 = 16 pixels ...

The DXT1 format use 64 bits for 4x4 = 16 pixels
(C0 and C1 rgb565 colors followed by 4x4 x2 bits = 64 bits)
(the bloc size is 4x4 pixels and use 2x16bits palette colors C0 and C1 + 4x4x2bits...
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