23
votes
Get vector length with GLM
Sorry folks for posting such a trivial issue! The issue is solved. I was using the wrong function. Here goes the correct one:
...
- 1,229
11
votes
Multiple viewports with modern OpenGL?
If you are writing your own Vertex/Fragment Shader there is another additional possibility to do this. It is much more complicated but might be useful for you and/or others. Additionally it speeds up ...
- 313
9
votes
Accepted
Multiple viewports with modern OpenGL?
Rendering to different viewports (parts) of the same screen can be done as follows:
For example splitting screen into four parts and rendering the same scene four times to each corner with different ...
- 2,119
4
votes
Multiple viewports with modern OpenGL?
This is a copy of @narthex's answer, except with only the viewports since that is all you need. I'm not sure why the frame buffer / blend stuff is included in his answer.
...
- 323
4
votes
Accepted
Ray-tracing the Cornell Box results in really inconsistent image
Two symptoms
There appear to be two problems with the image.
The background is showing through along the line between adjacent triangles.
The colour displayed is not always from the closest ...
4
votes
Accepted
Three quaternions interpolation with barycentric coordinates
Defining the problem
The weighted arithmetic mean $\mu$, of a set of vectors, minimizes squared L2 norm of the error ($v_i$) to all elements of the set.
$$
\begin{equation}
\begin{split}
v_i &= \...
- 314
4
votes
Accepted
My (ADS) shader doesn't render the light direction correctly
It seems to me, to be that your different positions and normals are not in the same space. Having them in the same space is important because else it might think the normal is pointing left while it ...
- 1,595
3
votes
Accepted
Am I passing the correct matrices for my shader? openGL/C++
I wasn't placing the lightposition into view space before passing it in.
vec4 LightPosition_view=view*LightPosition; //put lp into view space with the rest
When ...
- 203
2
votes
understanding glm::perspective vs glm::ortho
I don't understand why, if I make the first argument to glm::lookAt be glm::vec3(0.0f, 0.0f, 2.0f), I see nothing.
It's because of the up vector. If you think about the look-at operation, you specify ...
- 6,700
2
votes
Multiple viewports with modern OpenGL?
These are all good answers, and yet there is another way: (Isn't there always?)
Due to the growing popularity of virtual reality, the folks at OculusVR have developed a trio of "Multiview" ...
- 341
1
vote
Accepted
Converting points, vectors, normals between world and object space for a ray tracer gives weird results
I think you have the wrong order of matrix multiplication.
...
- 991
1
vote
Screen to World coordinates glm::unProject
You can calculate the world position of the pixel on near plane quite easily by first defining Normalized Device Coordinates (NDC) for the point and then transforming the NDC back to the world space. ...
- 3,616
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