# Search:

Type: Posts; User: Yandersen

Page 1 of 6 1

1. ## Thread: Orthonormalize three vectors

by Yandersen
Replies
11
Views
1,245

### The only thing is if the triangle lays on tips of...

The only thing is if the triangle lays on tips of the input vectors, then equal distances on the triangle plane will not imply equal rotation angles, actually. But I considered this approach and...
2. ## Thread: Orthonormalize three vectors

by Yandersen
Replies
11
Views
1,245

### Oh, sry, GClements, I see, I get it wrong. So you...

Oh, sry, GClements, I see, I get it wrong. So you suggest solving those 9 equations with solution containing the t parameter, then determine tmin from there and find the result for tmin. So the...
3. ## Thread: Khronos Group wants to hear from graphics app developers!

by Yandersen
Replies
12
Views
1,214

### Sticky: I don't understand this big fuss about the new...

I don't understand this big fuss about the new name - I used to and I love the old "OpenGL". There are even a 3rd party libraries grow around it mangling the name and API naming conventions like...
4. ## Thread: Orthonormalize three vectors

by Yandersen
Replies
11
Views
1,245

### Right! Just an illustration: if we take an...

Right! Just an illustration: if we take an orthotriplet and rotate it by any angle around the central axis - it will match another orthotriplet, and all 3 vectors will be rotated by the same angle in...
5. ## Thread: Orthonormalize three vectors

by Yandersen
Replies
11
Views
1,245

### But isn't the Gram–Schmidt orthonormalization...

But isn't the Gram–Schmidt orthonormalization unfair to the change of input vectors' directions just like in an "easy way" I show above?

Actually, I just developed some alternative solution. It is...
6. ## Thread: Orthonormalize three vectors

by Yandersen
Replies
11
Views
1,245

### Orthonormalize three vectors

There are two alternatives for rotational transformations: quaternions or matrices. I like matrices. But multiplying them many times produces numerical error which makes their vectors flow away from...
7. ## Thread: GLSL.hpp - GLSL emulation library

by Yandersen
Replies
0
Views
274

### GLSL.hpp - GLSL emulation library

No questions to ask - just an item I want to share with the community. I wrote a GLSL emulation library similar to glm, but all in one file. The short-cuts I had to take are:
-there are no...

by Yandersen
Replies
6
Views
499

### Thank you again, Alfonse!

Thank you again, Alfonse!

by Yandersen
Replies
8
Views
650

### Roberto, normally the texture matrix is identity...

Roberto, normally the texture matrix is identity matrix, so it's existence has kinda no effect when fixed functionality is used. It is so in case of basic model' skin texturing. But there was a time...

by Yandersen
Replies
6
Views
499

### I found a confusing moment there in specs about...

I found a confusing moment there in specs about the matrix constructors:What about the non-square matrices? If the same method will be used there, this will result in construction of degenerate...

by Yandersen
Replies
6
Views
499

### Thank you, Alfonse! Sorry for being specs-blind...

Thank you, Alfonse! Sorry for being specs-blind from time to time... :)

by Yandersen
Replies
6
Views
499

### GLSL questions

Hi!
Can't find in the GLSL specs anything about unary operators (--, ++) in relation to vector types. Are those applicable to vectors or only to the scalar integer types? Example:

ivec2 v = 0;...
13. ## Thread: Multiple rendering contexts and function pointers

by Yandersen
Replies
2
Views
437

### Thanks, mhagain! I hoped for that to be so! :)

Thanks, mhagain!
I hoped for that to be so! :)
14. ## Thread: Multiple rendering contexts and function pointers

by Yandersen
Replies
2
Views
437

### Multiple rendering contexts and function pointers

Those function pointers the user of OpenGL has to query with wglGetProcAddress - are those addresses static? I mean, every time the app launches and initializes OpenGL function pointers - does it...
15. ## Thread: OpenGL 4.5 support - how much longer to wait?!

by Yandersen
Replies
5
Views
820

### Oh, I finally remembered why it was so important!...

Oh, I finally remembered why it was so important! :D In the setup described above the clipping volume is limited by the area in front of the camera plane only (-z>=zNear). As the result, all clipped...
16. ## Thread: OpenGL 4.5 support - how much longer to wait?!

by Yandersen
Replies
5
Views
820

### I see this extension as part of the solution of...

I see this extension as part of the solution of the depth-fighting problem. Here is my plan that involves this extension:

1) Using glClipControl(GL_LOWER_LEFT,GL_ZERO_TO_ONE) we set the clipping...
17. ## Thread: OpenGL 4.5 support - how much longer to wait?!

by Yandersen
Replies
5
Views
820

### Thank you very much, Aleksandar. It is very sad...

Thank you very much, Aleksandar. It is very sad to hear how long it may take for the 4.5 features to become released to users. :( I remember the 4.4 version took no more than a few month to replace...

by Yandersen
Replies
29
Views
21,041

### Sticky: Sorry for offtop. Moved here...

Sorry for offtop. Moved here.
19. ## Thread: OpenGL 4.5 support - how much longer to wait?!

by Yandersen
Replies
5
Views
820

### OpenGL 4.5 support - how much longer to wait?!

Thank you, Aleksandar. So, there are no release drivers supporting OpenGL 4.5 at all or is it just a WinXP specific problem? Any ideas why is it so and if there is a chance the 4.5 will widespread...

by Yandersen
Replies
29
Views
21,041

### Sticky: Hello! The 4.5 version was here for a while,...

Hello!

The 4.5 version was here for a while, but it seems like nVidia does not hassle to support it in a variety of it's hardware. I have a GeForce GT 520 videocard and OpenGL 4.4 is still a...
21. ## Thread: VAO not working in OpenGL 4.5

by Yandersen
Replies
5
Views
975

### That is true, I remember. But try to find the...

That is true, I remember. But try to find the mention of that in the new specs:
http://www.opengl.org/sdk/docs/man4/html/glVertexAttribFormat.xhtml
I don't see a note about special value 0....
22. ## Thread: VAO not working in OpenGL 4.5

by Yandersen
Replies
5
Views
975

### Try to set a stride to a proper value, not 0.

Try to set a stride to a proper value, not 0.
23. ## Thread: Drawing without Vertex Buffer Object

by Yandersen
Replies
6
Views
1,101

### Yep. Here is the answer:There must be a valid...

Yep. Here is the answer:There must be a valid non-zero named VAO bound.
24. ## Thread: OpenGL depth problem/question

by Yandersen
Replies
4
Views
755

### You first. :) Do not take away from us a nice...

You first. :)
Do not take away from us a nice opportunity to laugh at the nooby code! :D
Whoops, I mean, show the codes, we will help you to correct it to make it work. :)
25. ## Thread: triangle strip: which triangle am I in?

by Yandersen
Replies
2
Views
564

### If you are using geometry shader, you can output...

If you are using geometry shader, you can output any per-triangle data using the "flat" modifier for it. Set this variable(s) once just before emitting the last vertex of the triangle.
Results 1 to 25 of 128
Page 1 of 6 1