View Profile: Aestivae - OpenGL Discussion and Help Forums

12-22-2012, 06:27 PM

Aestivae replied to a thread Line Z-fighting workaround in OpenGL coding: beginners

Another "d'oh" moment for me here... it's so obvious, now that you mention it, but I wouldn't have seen it otherwise. Thank you for your help.

4 replies | 328 view(s)

12-21-2012, 09:46 PM

Aestivae replied to a thread Line Z-fighting workaround in OpenGL coding: beginners

Thanks for this. It was there all along, but I was so focused on looking for "bitwise" keywords that it slipped right by me. I'll try MSAA out, it...

4 replies | 328 view(s)

12-21-2012, 07:03 PM

Aestivae replied to a thread OpenGL Programming Guide (7th Edition) Example Not Working in OpenGL coding: beginners

In your switch statement for the mouse buttons, you've got a curly brace mismatch after GLUT_MIDDLE_BUTTON. I can't say if that's actually the...

3 replies | 355 view(s)

12-21-2012, 06:42 PM

Aestivae started a thread Line Z-fighting workaround in OpenGL coding: beginners

Like I may have mentioned in my previous questions, I'm working on rendering a relatively high poly "model". Functionally, it's generated terrain...

4 replies | 328 view(s)

12-18-2012, 10:45 AM

Aestivae replied to a thread glLineWidth gives GL_INVALID_VALUE for widths > 1? in OpenGL coding: beginners

Hi Bob, You say "on a mac"; do you mean you are programming for Mac OS X or simulating your mobile application on a Mac? Based on your previous...

3 replies | 292 view(s)

12-18-2012, 10:18 AM

Aestivae replied to a thread LINE_STIPPLE problem in OpenGL coding: beginners

There's no reason you should call glBegin()/glEnd() that many times. OpenGL is a state machine at heart; when you call glBegin(GL_LINES) you go into...

3 replies | 300 view(s)

12-17-2012, 07:34 PM

Aestivae replied to a thread is glViewport needed or used in OpenGL ES 2.0? in OpenGL coding: beginners

I can't give you a 100% sure answer since I don't personally work with OpenGL ES 2.0, but you should still need it, if only just once during your...

5 replies | 497 view(s)

12-17-2012, 04:06 PM

Aestivae replied to a thread LINE_STIPPLE problem in OpenGL coding: beginners

As far as I know, the problem is that you can't glEnable(GL_LINE_STIPPLE) inside of a glBegin()/glEnd() block. In immediate mode OpenGL doesn't like...

3 replies | 300 view(s)

12-17-2012, 03:59 PM

Aestivae replied to a thread is glViewport needed or used in OpenGL ES 2.0? in OpenGL coding: beginners

Hi Bob, Don't confuse glViewport with the transformation matrices (as I did not too long ago). All glViewport does is define the area of the...

5 replies | 497 view(s)

12-17-2012, 03:52 PM

Aestivae replied to a thread Dynamically change the material color in OpenGL coding: beginners

From just this info, I can't say very much. A few things though: Why are you setting GL_SHININESS to a vector/array? GL_SHININESS takes a single...

1 replies | 226 view(s)

12-17-2012, 03:30 PM

Aestivae replied to a thread conversion 2D images into 3d images in OpenGL coding: beginners

No offense meant, fuyu, but I have to reiterate some of john's concerns. What field are you studying in? If you are "not capable to do the extraction...

9 replies | 1221 view(s)

12-17-2012, 02:20 PM

Aestivae replied to a thread glVertex3i Z can only be -1, 0, or 1. Why? in OpenGL coding: beginners

It really depends on if you're willing to rely on the GL utilities (glu.h) or use deprecated functions. I can't be entirely sure about your case...

7 replies | 558 view(s)

12-15-2012, 02:25 PM

Aestivae replied to a thread "Backface culling" GL_LINES in OpenGL coding: beginners

Following your advice, I went back to the math and found that a little bit of reworking with the "vision vector" pointing at one of the vertices of...

6 replies | 493 view(s)

12-14-2012, 08:11 AM

Aestivae replied to a thread "Backface culling" GL_LINES in OpenGL coding: beginners

Hi yoyonel, The problem is that in perspective projection, computing visibility isn't as simple as I'd like it. In an orthographic projection, all...

6 replies | 493 view(s)

12-13-2012, 08:45 PM

Aestivae started a thread "Backface culling" GL_LINES in OpenGL coding: beginners

I have a dynamically generated "grid" (more of a lattice, if anything) with variable distances between lines that I'm drawing via VBO and GL_LINES....

6 replies | 493 view(s)

12-07-2012, 07:37 AM

Aestivae replied to a thread simple shader -- how to use unsigned chars for colors? in OpenGL coding: beginners

Is that theoretical, or have you actually tested it? In my experience, OpenGL converts it before it ever gets to the shader; that's why you have to...

4 replies | 366 view(s)

12-07-2012, 07:15 AM

Aestivae replied to a thread drawing voxels in OpenGL coding: beginners

As long as you are drawing polygons, you will always be sending the same number of vertices to the GPU anyway. The only thing a VBO or display list...

4 replies | 484 view(s)

12-06-2012, 08:43 PM

Aestivae replied to a thread simple shader -- how to use unsigned chars for colors? in OpenGL coding: beginners

First thing I want to say: don't worry about optimization until you have it working already. That aside, shaders aren't really my strong point,...

4 replies | 366 view(s)

12-06-2012, 07:01 PM

Aestivae replied to a thread drawing voxels in OpenGL coding: beginners

I'm not 100% sure about OpenGL ES, but long story short, when it comes to voxel engines, you most likely will be using VBOs or display lists, where...

4 replies | 484 view(s)

12-06-2012, 08:55 AM

Aestivae replied to a thread How to create and draw texture bigger than MAX_TEXTURE_SIZE? in OpenGL coding: beginners

MAX_TEXTURE_SIZE is hardware dependent, so it's not strictly possible to create and draw a single texture bigger than that (if only because the GPU...

2 replies | 343 view(s)

12-06-2012, 08:23 AM

Aestivae replied to a thread Using OpenGL to implement data structures in OpenGL coding: beginners

This is a bit of a difficult project... how much time do you have to complete this? (And if you don't mind me asking, what is it for?) Your first...

3 replies | 375 view(s)

12-05-2012, 05:12 PM

Aestivae replied to a thread Problem with items staying projected on screen. in OpenGL coding: beginners

Glad to hear that it's working better now. As for your .pgm file loading, load the numbers directly into the char array. The spaces separating...

7 replies | 643 view(s)

12-05-2012, 06:35 AM

Aestivae replied to a thread OpenGL version/pipeline in OpenGL coding: beginners

If I am limited to OpenGL 3.2 at the highest (due to a binding restriction on one of my intended platforms), would it still be a good idea to step up...

6 replies | 673 view(s)

12-05-2012, 06:26 AM

Aestivae replied to a thread Is it an omission in the reference doc? in OpenGL coding: beginners

This is the documentation you're referring to, right? In a sense, you're right, but it's mostly that GL_INVALID_ENUM is somewhat of a universal...

2 replies | 274 view(s)

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