hello.
I'm new to trigonometry and math and i'm studing it.
For practice i'm creating a c++ program that gets the points of a line (as input)and calculates the direction or slope of this line(as...

i see your article and i try to use a orthographics projection.
i use glm for that
the vbo points are related to the viewport, is correct?

If so

1)i can create a window of 400 x 400

...

hello,
I use this chunk of code for setup a windows for opengl 3.3:


HWND CreateAppWindow(const WNDCLASSEX &wcl, const char *pszTitle)
{
// Create a window that is centered on the...

hello.
I would use a sort algorithm that works with multiple indices.
For example i would sort based on cx and cy a set of 2d point.
I think to x and y combined in a color and i wish extract the...

hello.
How i can adapt a range from x to y to a range from 0 to 1 in glsl?
for example : if i have a x = -20 and a y = 200 how to fit in a 0 to 1 range?
there is an already done function?
thanks.

thanks.
I must creating some a4 file image at hight scanner resolution, do the sobel filter in opencl, and visualize the sobel filter result in a windows of qt always in opengl.

1)Is possible do...

hello.
I have created a simple 3d engine for my purposes that support texture , vbo ecc....
Now I would create an opengl project that displays scanned a4 documents .
I think to use two triangles...

very thanks.
I understand.
by

yes , i'm drawing in only in 2d.
I try to add a matrix to my shader, for example MVO with the orto matrix and send it to the shader.


#version 330
in vec3 VertexPosition;
uniform mat4 MVO;...

hello.
I have create a system that draws little circles or points in opengl 3 where I click the mouse in a qt opengl widget.
The problem are the coordinates: the circle is not drawed in the...

hello.
I must do a 2d editor with opengl.
I must have a panel with a texture that occupy all the screen and over this panel i must draw line and a disk(a filled 2d circle).
I wish draw the panel...

but

gluUnProject(point->x, point->y, point->z, modelMatrix, projMatrix, viewport, &objx, &objy, &objz);
is not the same as MVP->transpose() * point?
in this case i can use the transpose,...

very thanks.
Now that i know that exist a qt camera i use it.
But i would explain that i must do : i wish do a like acrobat reader application.
I have an a4(sheet) that is a 2d texture(just a...

very thanks Praetorian.
Is properly as you described.
But my goal is to create a 2d camera for zooming and translating.
For this in another post i asked if glortho returns a matrix.
How i can get...

no , i would implement my own picking , for many reason.
thanks

hello.
I have a qt gui interface with an opengl widget.
I can draw disks(2d circular mesh) and lines, my problem is the picking.
1)how i can create a ray with a direction from the mouse for the...

hello.
I have implemented a little engine for drawing in opengl(2d) inside a qt interface .
Now i must implement something like at the acrobat reader's interface :
A document area with zoom and...

hello.
Is possible to retrieve the vertexes of the geometry shader or of the vertex shader on the cpu?
For example(but it's only an example for try and understand), if i have a skinned mesh , is...

hello.
I don't understand the use in opengl of the
glVertexAttribPointer(glGetAttribLocation(shaderProgram1, "VertexPosition"), 3, GL_FLOAT, GL_FALSE, sizeof(Vertexes), ...

hello.
I have created an ifc importer for my company software.
I have imported all the entities(beam,wall,slab ec.c..)with the extrusion solid representation.
Now i must import brep geometry, but...

hello.
I'm implementing a simple project for bidimensional shapes's drawing using opengl.
I already implemented a little engine for manage vbo buffers ,camera and shaders.
The 3d scene is...

hello.
I wish create an opengl context with viewport ecc...in opengl 3 but without using glut.
there are some examples on opengl.org ?
I can't find nothing.

thanks

hello.
I have a simple project that creates some vertex buffer , then bind them to a shader that does the render of the buffers.
I see in some application that i find in google that the vertex...

hello.
I'm considering the idea of create a multicore (with parallel_for or so)scenegraph for my rendering system.
I ask if is possible since i think that is the rendering section the...

hello.
I'm trying to create an ifc importer(an architectural format).
My problems are at the start:
1)i must use matrixes and vectors , how is knows :
1a)the order of multiplication of the...