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Type: Posts; User: Yandersen

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1. ## Thread: Intersect triangle with segment

by Yandersen
Replies
5
Views
445

### Thank you, GClements, indeed the algorithm gives...

Thank you, GClements, indeed the algorithm gives the same result for intersection point. I manually checked conditions - no_intersection_conditions reported correctly ("false" returned). I rewrote...
2. ## Thread: Intersect triangle with segment

by Yandersen
Replies
5
Views
445

### Wow... That is too much for me, I guess... I...

Wow... That is too much for me, I guess... I solved the problem geometrically, through relativity of the volumes (which is calculated as a determinant of 3x3 matrix composed of three vectors forming...
3. ## Thread: Intersect triangle with segment

by Yandersen
Replies
5
Views
445

### Intersect triangle with segment

Hi!
Basic task - to find the intersection point between a line segment with corner points S1 and S2 and a triangle with vertices A,B,C.

To do this I wrote a function that calculates partial...
4. ## Thread: glTextureSubImage2D vs GL_TEXTURE_CUBE_MAP

by Yandersen
Replies
4
Views
469

### Clearly, that was one of a hundreds...

Clearly, that was one of a hundreds typos/mistakes I mentioned for a last few month. The whole docs have to be "bulldozered", function-by-function.
5. ## Thread: glTextureSubImage2D vs GL_TEXTURE_CUBE_MAP

by Yandersen
Replies
4
Views
469

### Thank you, Alfonse! P.S.: man4 pages have more...

Thank you, Alfonse!

P.S.: man4 pages have more bugs than information. Shame no one maintains the documentation.
6. ## Thread: glTextureSubImage2D vs GL_TEXTURE_CUBE_MAP

by Yandersen
Replies
4
Views
469

### glTextureSubImage2D vs GL_TEXTURE_CUBE_MAP

Hello!
In OpenGL4.5 we got DSA providing the alternative texture uploading functions that take a texture ID instead of the target as a parameter:

void glTextureSubImage2D(
GLuint texture,
...
7. ## Thread: Lines at the end of a texture

by Yandersen
Replies
10
Views
735

### Seems like the target implementation does not...

Seems like the target implementation does not support non-POT textures? Nowadays?! :O
8. ## Thread: opengl draw lines doubt

by Yandersen
Replies
4
Views
490

### You are welcome, but it should. :) Would you...

You are welcome, but it should. :)
Would you post a line-drawing part of code?
9. ## Thread: Lines at the end of a texture

by Yandersen
Replies
10
Views
735

### Check wrapping parameters (GL_TEXTURE_WRAP_S,...

Check wrapping parameters (GL_TEXTURE_WRAP_S, GL_TEXTURE_WRAP_T) - maybe you see pixels from the opposite side of the image while you prefer edge clamping (GL_CLAMP_TO_EDGE)?
10. ## Thread: Code not wirking on windows =S

by Yandersen
Replies
3
Views
395

### Strange problem. Memory fragmentation, buffer...

Strange problem. Memory fragmentation, buffer overflow?
If the drawing code the same, check if the window has depth buffer and it is cleared each frame and the SwapBuffers() called. Maybe?.. :)
11. ## Thread: opengl draw lines doubt

by Yandersen
Replies
4
Views
490

### Where one line ends another should start. Do not...

Where one line ends another should start. Do not start or end two lines at the same spot, I guess, and the extra pixel will not be needed - just reverse direction of some lines.
12. ## Thread: Heightmap flattens if model is rendered

by Yandersen
Replies
1
Views
272

### There is not enough info provided to figure out...

There is not enough info provided to figure out the problem. If the elevation of terrain height values is controlled by some uniform scaling factor, that uniform may have changed somehow to a zero....

by Yandersen
Replies
4
Views
364

### Oh, I see. Now I understand. :) Thank you very...

Oh, I see. Now I understand. :)
Thank you very much, guys!

by Yandersen
Replies
4
Views
364

### Well, for regular cubemap textures I create a...

Well, for regular cubemap textures I create a GL_TEXTURE_CUBE_MAP type texture, then I upload images using glTexImage2D to 6 different targets: GL_TEXTURE_CUBE_MAP_*_*. Now, if I understand...

by Yandersen
Replies
4
Views
364

### Gl_texture_cube_map_array

Hi!
I have troubles understanding the process of creation and image' uploading of this new fancy texture type - the specs and wiki did not gave me a clear picture on that process. No examples I...
16. ## Thread: True Camera via OpenGL4.5

by Yandersen
Replies
9
Views
2,906

### Alfonse, no matter how precise we call it, the...

Alfonse, no matter how precise we call it, the algorithm will still be the same. The technique is already proven to be working. :)
BTW, if you like it, feel free to make your own publication on the...
17. ## Thread: True Camera via OpenGL4.5

by Yandersen
Replies
9
Views
2,906

### Hm, thanks, but I will change it a bit, because...

Hm, thanks, but I will change it a bit, because vertex' Z is not mapped to [-1...1] range, actually...
18. ## Thread: True Camera via OpenGL4.5

by Yandersen
Replies
9
Views
2,906

### Changed to gl_FragCoord.z. Thank you, Alfonse!

Changed to gl_FragCoord.z. Thank you, Alfonse!
19. ## Thread: True Camera via OpenGL4.5

by Yandersen
Replies
9
Views
2,906

### True Camera via OpenGL4.5

Gentlemen, I want to share the new (at least to my knowledge) technique with you. :)

As we know, rendering large scenes had always been tricky: if near clipping plane set too close, depth-fighting...
20. ## Thread: DSA requires binding?!

by Yandersen
Replies
2
Views
519

### OMG, I am so ashamed... Thank you, Alfonse, I...

OMG, I am so ashamed...
Thank you, Alfonse, I happened to forget about those functions completely...:doh:
21. ## Thread: DSA requires binding?!

by Yandersen
Replies
2
Views
519

### DSA requires binding?!

Hello!
Playing with Direct State Access functions right now. Just discovered smg unexpected creating a framebuffer: it seems like DSA functions generate GL_INVALID_OPERATION when I attempt to apply...
22. ## Thread: Orthonormalize three vectors

by Yandersen
Replies
11
Views
1,881

### 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...
23. ## Thread: Orthonormalize three vectors

by Yandersen
Replies
11
Views
1,881

### 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...
24. ## Thread: Khronos Group wants to hear from graphics app developers!

by Yandersen
Replies
12
Views
2,844

### 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...
25. ## Thread: Orthonormalize three vectors

by Yandersen
Replies
11
Views
1,881

### 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...
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